Thin-Walled Structures最新文献

英文中文

Vibration mitigation of flexible beams through boundary motion with enhanced time-delayed control

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-07 DOI: 10.1016/j.tws.2025.113056

Wei Chu , Chaofeng Li , Zhipeng Lyu

Time-delayed control has shown effectiveness in vibration mitigation of flexible beams. Yet, classical time-delayed controllers are not suitable for unknown excitation frequencies and higher-order vibrations due to their lack of adaptive adjustment for the optimal time delay. In this paper, a method based on time-delayed control is proposed for planning boundary motion to mitigate vibrations of flexible beams, which is applicable for unknown external excitation frequencies, and is also effective for higher-order vibration mitigation. The theoretical model is developed using the Lagrange equations derived from the Euler-Bernoulli beam theory, which takes into account the geometrical nonlinearity of flexible beams. It is found that the effect of boundary motion on the vibration of the flexible beam shows a harmonic relationship with the time delay and a linear correlation with the gain in the control algorithm by analyzing the variation of the system's energy. The optimal time delay is determined based on the instantaneous frequency, which is identified using the short-time Fourier transform. Furthermore, the optimal time delay is also dependent on the resonance order and switches between two values accordingly. To this end, a bang-bang algorithm is employed to adaptively adjust the time delay. Both theoretical and experimental results confirm the effectiveness of the proposed method in mitigating flexible beam vibrations. The method exhibits robustness against random disturbances affecting the system.

{"title":"Vibration mitigation of flexible beams through boundary motion with enhanced time-delayed control","authors":"Wei Chu , Chaofeng Li , Zhipeng Lyu","doi":"10.1016/j.tws.2025.113056","DOIUrl":"10.1016/j.tws.2025.113056","url":null,"abstract":"<div><div>Time-delayed control has shown effectiveness in vibration mitigation of flexible beams. Yet, classical time-delayed controllers are not suitable for unknown excitation frequencies and higher-order vibrations due to their lack of adaptive adjustment for the optimal time delay. In this paper, a method based on time-delayed control is proposed for planning boundary motion to mitigate vibrations of flexible beams, which is applicable for unknown external excitation frequencies, and is also effective for higher-order vibration mitigation. The theoretical model is developed using the Lagrange equations derived from the Euler-Bernoulli beam theory, which takes into account the geometrical nonlinearity of flexible beams. It is found that the effect of boundary motion on the vibration of the flexible beam shows a harmonic relationship with the time delay and a linear correlation with the gain in the control algorithm by analyzing the variation of the system's energy. The optimal time delay is determined based on the instantaneous frequency, which is identified using the short-time Fourier transform. Furthermore, the optimal time delay is also dependent on the resonance order and switches between two values accordingly. To this end, a bang-bang algorithm is employed to adaptively adjust the time delay. Both theoretical and experimental results confirm the effectiveness of the proposed method in mitigating flexible beam vibrations. The method exhibits robustness against random disturbances affecting the system.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113056"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved shell-finite strip method for inelastic buckling analysis of thin-walled steel members with residual stresses

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-07 DOI: 10.1016/j.tws.2025.113064

Wen-Long Gao , Liang Chen , Ronald D. Ziemian , Si-Wei Liu

This study investigates the inelastic buckling behavior of thin-walled steel members, with a specific focus on cold-formed steel members considering residual stresses. This behavior is essential for determining load-bearing capacities, yet it is often influenced by complex factors such as local-global interactive buckling, material yielding, and residual stresses. Current methods, including the Direct Strength Method (DSM), predominantly rely on the elastic Shell-Finite Strip Method (SFSM) and empirical formulations, which are primarily suited for regular cross-sections but less effective for those with complex geometries. Alternatively, the advanced Shell Finite Element Method (SFEM) is highly adaptable to various cross-sections and delivers accurate analyses; however, its significant computational cost limits routine applications. This research introduces an improved SFSM that integrates material inelasticity and residual stresses, enabling efficient and accurate buckling analysis for thin-walled steel members with arbitrary cross-sections. Validation using five examples demonstrates the accuracy and computational efficiency of proposed method, showing strong agreement with experimental data and SFEM results. The developed algorithms are implemented in the free educational software platform MSASect2.

{"title":"Improved shell-finite strip method for inelastic buckling analysis of thin-walled steel members with residual stresses","authors":"Wen-Long Gao , Liang Chen , Ronald D. Ziemian , Si-Wei Liu","doi":"10.1016/j.tws.2025.113064","DOIUrl":"10.1016/j.tws.2025.113064","url":null,"abstract":"<div><div>This study investigates the inelastic buckling behavior of thin-walled steel members, with a specific focus on cold-formed steel members considering residual stresses. This behavior is essential for determining load-bearing capacities, yet it is often influenced by complex factors such as local-global interactive buckling, material yielding, and residual stresses. Current methods, including the Direct Strength Method (DSM), predominantly rely on the elastic Shell-Finite Strip Method (SFSM) and empirical formulations, which are primarily suited for regular cross-sections but less effective for those with complex geometries. Alternatively, the advanced Shell Finite Element Method (SFEM) is highly adaptable to various cross-sections and delivers accurate analyses; however, its significant computational cost limits routine applications. This research introduces an improved SFSM that integrates material inelasticity and residual stresses, enabling efficient and accurate buckling analysis for thin-walled steel members with arbitrary cross-sections. Validation using five examples demonstrates the accuracy and computational efficiency of proposed method, showing strong agreement with experimental data and SFEM results. The developed algorithms are implemented in the free educational software platform MSASect2.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113064"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and validation of an equivalent honeycomb model

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-07 DOI: 10.1016/j.tws.2025.113058

Jiaming Wang , Haifeng Yang , Zhigang Li , Yi Xie , Jianyu Gao , Fangyu Chen , Huiqing Lan

Due to their low density, high strength and high specific energy absorption, honeycombs have been widely employed as excellent energy-absorbing structures in crashworthiness design. However, the computational cost of detailed finite element (FE) models of honeycombs is prohibitively high, due to the small size and large number of elements involved. Therefore, to reduce computational time while ensuring accuracy, equivalent modeling methods for honeycombs are of particular interest to researchers. In this study, tests were conducted on aluminum honeycombs to investigate anisotropy, strain rate effects and tearing effects. The results indicated that the compressive strength decreased with increasing off-axis angles and increased with rising strain rates, and it was enhanced due to the tearing force. Based on the test results, the basic mechanical parameters, including elastic modulus, plateau stress, densification strain, and densification modulus, were obtained. More importantly, a continuous solid equivalent honeycomb model was developed, in which a modified Hill48 yield criterion and a segmented linearity rate-dependent hardening model were adopted to describe the anisotropic properties and strain rate effect of the honeycomb, and beam elements with failure criteria were utilized to characterize the tearing effect. The developed equivalent constitutive model was implemented into LS-DYNA via user material subroutine (UMAT) for numerical simulation. The simulation results were highly consistent with the test results, demonstrating the reliability of this equivalent honeycomb model.

{"title":"Development and validation of an equivalent honeycomb model","authors":"Jiaming Wang , Haifeng Yang , Zhigang Li , Yi Xie , Jianyu Gao , Fangyu Chen , Huiqing Lan","doi":"10.1016/j.tws.2025.113058","DOIUrl":"10.1016/j.tws.2025.113058","url":null,"abstract":"<div><div>Due to their low density, high strength and high specific energy absorption, honeycombs have been widely employed as excellent energy-absorbing structures in crashworthiness design. However, the computational cost of detailed finite element (FE) models of honeycombs is prohibitively high, due to the small size and large number of elements involved. Therefore, to reduce computational time while ensuring accuracy, equivalent modeling methods for honeycombs are of particular interest to researchers. In this study, tests were conducted on aluminum honeycombs to investigate anisotropy, strain rate effects and tearing effects. The results indicated that the compressive strength decreased with increasing off-axis angles and increased with rising strain rates, and it was enhanced due to the tearing force. Based on the test results, the basic mechanical parameters, including elastic modulus, plateau stress, densification strain, and densification modulus, were obtained. More importantly, a continuous solid equivalent honeycomb model was developed, in which a modified Hill48 yield criterion and a segmented linearity rate-dependent hardening model were adopted to describe the anisotropic properties and strain rate effect of the honeycomb, and beam elements with failure criteria were utilized to characterize the tearing effect. The developed equivalent constitutive model was implemented into LS-DYNA via user material subroutine (UMAT) for numerical simulation. The simulation results were highly consistent with the test results, demonstrating the reliability of this equivalent honeycomb model.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113058"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seismic behavior of assembled self-centering buckling-restrained brace based on shape memory alloy cables

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-07 DOI: 10.1016/j.tws.2025.113044

Yu Shi , Zulong Li , Xiaowei Ran , Ziqi Zhao , Xiong Peng

This paper presents the development and validation of the concept of an assembled self-centering buckling-restrained brace (ASC-BRB) based on shape memory alloy (SMA) cables. It consists of a self-centering system composed of SMA cables and an energy-dissipation system comprising core plates and restraining members. All members can be reused after earthquakes, except for the core plates that undergo damage. This paper comprehensively details the configuration, working mechanism, theoretical hysteretic model, and design methodology of the ASC-BRB. Subsequently, quasi-static tests conducted to investigate the effects of mechanical training, SMA area, core plate area, and SMA cable pre-tensioning force on the performance of the ASC-BRB are described. The experimental results demonstrate that the ASC-BRB exhibits favorable energy dissipation and self-centering capabilities in comparison to the BRB (buckling-restrained brace). Experimental validation of the proposed theoretical hysteresis and finite element models are further described. Finally, some design suggestions based on the parametric analysis are summarized.

{"title":"Seismic behavior of assembled self-centering buckling-restrained brace based on shape memory alloy cables","authors":"Yu Shi , Zulong Li , Xiaowei Ran , Ziqi Zhao , Xiong Peng","doi":"10.1016/j.tws.2025.113044","DOIUrl":"10.1016/j.tws.2025.113044","url":null,"abstract":"<div><div>This paper presents the development and validation of the concept of an assembled self-centering buckling-restrained brace (ASC-BRB) based on shape memory alloy (SMA) cables. It consists of a self-centering system composed of SMA cables and an energy-dissipation system comprising core plates and restraining members. All members can be reused after earthquakes, except for the core plates that undergo damage. This paper comprehensively details the configuration, working mechanism, theoretical hysteretic model, and design methodology of the ASC-BRB. Subsequently, quasi-static tests conducted to investigate the effects of mechanical training, SMA area, core plate area, and SMA cable pre-tensioning force on the performance of the ASC-BRB are described. The experimental results demonstrate that the ASC-BRB exhibits favorable energy dissipation and self-centering capabilities in comparison to the BRB (buckling-restrained brace). Experimental validation of the proposed theoretical hysteresis and finite element models are further described. Finally, some design suggestions based on the parametric analysis are summarized.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113044"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical prediction for energy absorption properties of 3D lattice structures

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-06 DOI: 10.1016/j.tws.2025.113043

Hanfeng Yin , Ning Wang , Lijia Wu , Guilin Wen , Jie Liu

Due to the development of additive manufacturing technology, a lot of complex 3D cellular structures can be manufactured. Therefore, there has been a significant growing interest in 3D printing cellular structures due to their excellent mechanical properties. As one type of periodic 3D cellular structure, triply periodic minimal surface (TPMS) lattice structure is investigated widely because it is found to have higher energy absorption capacity than the traditional 3D cellular structure. However, the previous investigation on TPMS structure was mainly implemented by simulation or experiment study. There is little theoretical prediction about the energy absorption properties of the TPMS structure. Hence, the theoretical prediction for TPMS structure is carried out in this study using the folding element theory together with the principle of conservation of energy. Three TPMS structures under axial crushing loading are theoretically analyzed. According to the comparison results, it is found that the theoretical prediction of mean crushing stress is in good agreement with both experimental and numerical simulation results. The theoretical prediction method can clearly reveal the influence rule of the structural parameters on the energy absorption of the TPMS structure. Moreover, the energy absorption of TPMS can be calculated conveniently by the theoretical prediction. Thus, the theoretical reference of TPMS cellular structures for its engineering application is provided.

{"title":"Theoretical prediction for energy absorption properties of 3D lattice structures","authors":"Hanfeng Yin , Ning Wang , Lijia Wu , Guilin Wen , Jie Liu","doi":"10.1016/j.tws.2025.113043","DOIUrl":"10.1016/j.tws.2025.113043","url":null,"abstract":"<div><div>Due to the development of additive manufacturing technology, a lot of complex 3D cellular structures can be manufactured. Therefore, there has been a significant growing interest in 3D printing cellular structures due to their excellent mechanical properties. As one type of periodic 3D cellular structure, triply periodic minimal surface (TPMS) lattice structure is investigated widely because it is found to have higher energy absorption capacity than the traditional 3D cellular structure. However, the previous investigation on TPMS structure was mainly implemented by simulation or experiment study. There is little theoretical prediction about the energy absorption properties of the TPMS structure. Hence, the theoretical prediction for TPMS structure is carried out in this study using the folding element theory together with the principle of conservation of energy. Three TPMS structures under axial crushing loading are theoretically analyzed. According to the comparison results, it is found that the theoretical prediction of mean crushing stress is in good agreement with both experimental and numerical simulation results. The theoretical prediction method can clearly reveal the influence rule of the structural parameters on the energy absorption of the TPMS structure. Moreover, the energy absorption of TPMS can be calculated conveniently by the theoretical prediction. Thus, the theoretical reference of TPMS cellular structures for its engineering application is provided.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113043"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling and simulation of high-frequency vibration of headrace tunnel in a pumped storage power station considering imperfect bounding condition 考虑不完善约束条件的抽水蓄能电站顶管隧道高频振动建模与仿真

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-06 DOI: 10.1016/j.tws.2025.113021

Xiuwei Yang , Jijian Lian , Haijun Wang , Xiaoqun Wang

High-frequency vibration (HFV) is a recently reported phenomenon in the headrace tunnel of pumped storage power stations (PSPS). These vibrations propagate through the upstream mountain, generating severe noise on the surface and disrupting the lives of local residents. In some cases, it may be necessary to relocate these residents, which increases the secondary costs associated with constructing PSPS. Therefore, modeling and predicting the vibration intensity of the headrace tunnel is crucial for the engineering design and stable operation of these facilities. In this study, a numerical model is developed to simulate the HFV response of the headrace tunnel, considering the interactions between the fluid, pipe, and surrounding rock. The interface between the pipe and surrounding rock is normally imperfectly bounded due to the existence of uneven surfaces, waterproof layers and interstices, and so on. The linear spring model is introduced to describe these imperfect characteristics. This study provides a strategy for determining the spring constants, which can be used to estimate the bonding degree between the pipe and the surrounding rock. The vibration response of the headrace tunnel is investigated based on the data from an actual PSPS, and the dominant vibration characteristics are analyzed.

{"title":"Modeling and simulation of high-frequency vibration of headrace tunnel in a pumped storage power station considering imperfect bounding condition","authors":"Xiuwei Yang , Jijian Lian , Haijun Wang , Xiaoqun Wang","doi":"10.1016/j.tws.2025.113021","DOIUrl":"10.1016/j.tws.2025.113021","url":null,"abstract":"<div><div>High-frequency vibration (HFV) is a recently reported phenomenon in the headrace tunnel of pumped storage power stations (PSPS). These vibrations propagate through the upstream mountain, generating severe noise on the surface and disrupting the lives of local residents. In some cases, it may be necessary to relocate these residents, which increases the secondary costs associated with constructing PSPS. Therefore, modeling and predicting the vibration intensity of the headrace tunnel is crucial for the engineering design and stable operation of these facilities. In this study, a numerical model is developed to simulate the HFV response of the headrace tunnel, considering the interactions between the fluid, pipe, and surrounding rock. The interface between the pipe and surrounding rock is normally imperfectly bounded due to the existence of uneven surfaces, waterproof layers and interstices, and so on. The linear spring model is introduced to describe these imperfect characteristics. This study provides a strategy for determining the spring constants, which can be used to estimate the bonding degree between the pipe and the surrounding rock. The vibration response of the headrace tunnel is investigated based on the data from an actual PSPS, and the dominant vibration characteristics are analyzed.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113021"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determine the electrical conductivity of open-cell cellular solids based on the characteristics of mesoscale structure

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-06 DOI: 10.1016/j.tws.2025.113054

Z.J. Dai , Q.M. Li

Mesoscale structure characteristics of cellular solids can significantly influence their mechanical behaviors and physical properties (i.e. electrical conductivity in this study). However, there is a lack of accurate and efficient model to describe the relationship between the electrical conductivity of cellular solids and their mesoscale structure characteristics. In this paper, the electrical conductivity of the open-cell cellular solids is studied using mesoscale 3D Voronoi models with geometric parameters obtained from computed tomography statistics of real open-cell foams. The tortuosity is introduced to describe the complexity of internal connecting path and the image-based analysis is used to calculate the tortuosity and electrical conductivity of mesoscale model, which is verified by the finite element method. The results clarify the existing problems in the classic electrical conductivity model derived by Ashby et al. and the correlation between the derivation of electrical conductivity of regular mesoscale model and the analysis of tortuosity is clarified. A new and accurate relationship between relative electrical conductivity and relative density is proposed, in which the constant can be determined by tortuosity without using empirical parameters. Furthermore, it is shown that tortuosity can be used to quantify the different gradient distributions and random structural defects. The results and findings of this study offer a valuable understanding of the role of mesoscale model in the study of mechanical and physical properties of cellular solids, which facilitates the description and design of cellular solids.

{"title":"Determine the electrical conductivity of open-cell cellular solids based on the characteristics of mesoscale structure","authors":"Z.J. Dai , Q.M. Li","doi":"10.1016/j.tws.2025.113054","DOIUrl":"10.1016/j.tws.2025.113054","url":null,"abstract":"<div><div>Mesoscale structure characteristics of cellular solids can significantly influence their mechanical behaviors and physical properties (i.e. electrical conductivity in this study). However, there is a lack of accurate and efficient model to describe the relationship between the electrical conductivity of cellular solids and their mesoscale structure characteristics. In this paper, the electrical conductivity of the open-cell cellular solids is studied using mesoscale 3D Voronoi models with geometric parameters obtained from computed tomography statistics of real open-cell foams. The tortuosity is introduced to describe the complexity of internal connecting path and the image-based analysis is used to calculate the tortuosity and electrical conductivity of mesoscale model, which is verified by the finite element method. The results clarify the existing problems in the classic electrical conductivity model derived by Ashby et al. and the correlation between the derivation of electrical conductivity of regular mesoscale model and the analysis of tortuosity is clarified. A new and accurate relationship between relative electrical conductivity and relative density is proposed, in which the constant can be determined by tortuosity without using empirical parameters. Furthermore, it is shown that tortuosity can be used to quantify the different gradient distributions and random structural defects. The results and findings of this study offer a valuable understanding of the role of mesoscale model in the study of mechanical and physical properties of cellular solids, which facilitates the description and design of cellular solids.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113054"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical response of CFRP-reinforced hollow ultra-high strength steel circular tubes under static axial compression and bending loads: Experimental and numerical investigations

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-06 DOI: 10.1016/j.tws.2025.113046

L.T. Lee, F. Azhari, A. Heidarpour

This paper aims to investigate the mechanical performance of CFRP-reinforced hollow ultra-high strength steel (UHSS) circular tubular columns under static axial compression and three-point bending tests. Using CFRP sheets to strengthen steel members with the aid of epoxy as the bonding agent can increase the stiffness, strength-to-weight ratio, and corrosion resistance, which can extend the service life of structures while reducing maintenance requirements. Bare and CFRP-reinforced circular hollow section steel columns made of four different grades of steel, including mild steel (MS) grade 350 and UHSS grades 700, 800, and 1200, are examined. To explore the effect of shape, the results of circular hollow tubular sections are compared with square hollow sections. The load-displacement curves, strength and failure modes obtained from the large-scale experimental tests and nonlinear finite element (FE) models are discussed. Analytical predictions are also compared with experimental results. The outcome of this study will provide insights into the coupled effects of CFRP reinforcement and steel grade, in improving the static axial and lateral responses of the steel columns.

{"title":"Mechanical response of CFRP-reinforced hollow ultra-high strength steel circular tubes under static axial compression and bending loads: Experimental and numerical investigations","authors":"L.T. Lee, F. Azhari, A. Heidarpour","doi":"10.1016/j.tws.2025.113046","DOIUrl":"10.1016/j.tws.2025.113046","url":null,"abstract":"<div><div>This paper aims to investigate the mechanical performance of CFRP-reinforced hollow ultra-high strength steel (UHSS) circular tubular columns under static axial compression and three-point bending tests. Using CFRP sheets to strengthen steel members with the aid of epoxy as the bonding agent can increase the stiffness, strength-to-weight ratio, and corrosion resistance, which can extend the service life of structures while reducing maintenance requirements. Bare and CFRP-reinforced circular hollow section steel columns made of four different grades of steel, including mild steel (MS) grade 350 and UHSS grades 700, 800, and 1200, are examined. To explore the effect of shape, the results of circular hollow tubular sections are compared with square hollow sections. The load-displacement curves, strength and failure modes obtained from the large-scale experimental tests and nonlinear finite element (FE) models are discussed. Analytical predictions are also compared with experimental results. The outcome of this study will provide insights into the coupled effects of CFRP reinforcement and steel grade, in improving the static axial and lateral responses of the steel columns.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113046"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel test designs for assessing the shear fracture forming limit in thin-walled tubes

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-06 DOI: 10.1016/j.tws.2025.113048

C. Suntaxi , J.A. López-Fernández , G. Centeno , C. Vallellano

Thin-walled tubes are used for the manufacturing of essential components in several industries. Indeed, the characterization of their formability and failure is vital for tool design, product quality and safety. In the recent years, the number of procedures and test designs for characterizing tubes in forming has experienced a significant development. This progress has been achieved in combination with the use of digital image correlation techniques and finite element analysis, making use of different plastic anisotropy criteria. Nevertheless, most of those tests are aimed at the assessment of failure in mode I of fracture mechanics, being the analysis of fracture under in-plane shear, i.e. mode II of fracture mechanics, reduced to a very limited number of research works based in the adaptation of the corresponding sheet metal forming tests inducing shear. To this regard, this work presents two new procedures based on the specific thin-walled tube geometry for characterizing formability in-plane shear and failure in mode II of fracture mechanics, addressing the absence of specific experimental methods for evaluating the shear fracture forming limit (SFFL) for tubes. The results, based on a combined numerical modelling and experimental analysis of the proposed tests, show that the SFFL can be accurately evaluated by controlling a set of geometrical parameters in the specimens designed to generate shear in tubes by applying either tensile or compressive forces. These proposed tests provide a valuable tool for characterizing the SFFL of thin-walled tubes.

{"title":"Novel test designs for assessing the shear fracture forming limit in thin-walled tubes","authors":"C. Suntaxi , J.A. López-Fernández , G. Centeno , C. Vallellano","doi":"10.1016/j.tws.2025.113048","DOIUrl":"10.1016/j.tws.2025.113048","url":null,"abstract":"<div><div>Thin-walled tubes are used for the manufacturing of essential components in several industries. Indeed, the characterization of their formability and failure is vital for tool design, product quality and safety. In the recent years, the number of procedures and test designs for characterizing tubes in forming has experienced a significant development. This progress has been achieved in combination with the use of digital image correlation techniques and finite element analysis, making use of different plastic anisotropy criteria. Nevertheless, most of those tests are aimed at the assessment of failure in mode I of fracture mechanics, being the analysis of fracture under in-plane shear, i.e. mode II of fracture mechanics, reduced to a very limited number of research works based in the adaptation of the corresponding sheet metal forming tests inducing shear. To this regard, this work presents two new procedures based on the specific thin-walled tube geometry for characterizing formability in-plane shear and failure in mode II of fracture mechanics, addressing the absence of specific experimental methods for evaluating the shear fracture forming limit (SFFL) for tubes. The results, based on a combined numerical modelling and experimental analysis of the proposed tests, show that the SFFL can be accurately evaluated by controlling a set of geometrical parameters in the specimens designed to generate shear in tubes by applying either tensile or compressive forces. These proposed tests provide a valuable tool for characterizing the SFFL of thin-walled tubes.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113048"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143323027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal vibration of stiffened FGM plates with cutouts using Nitsche-based isogeometric approach

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2025-02-05 DOI: 10.1016/j.tws.2025.113026

Yuan Wang , Bo Liu , Junjie Zhu , Wangfan Zhou , Libo Jiang , Chaofeng Pan , Jiangping Xu

Based on the integration of first-order shear deformation concept and the principle of Timoshenko’s beam theory, we develop an isogeometric analysis (IGA) framework for the study of free vibration characteristics in stiffened functionally graded material (FGM) plates, both with and without stiffeners and cutouts, under three typical thermal loads. The framework introduces a physical neutral surface for a precise description of the material properties of FGM plate along the thickness direction. Initially, the stiffened FGM plates with or without cutouts, are modeled employing non-overlapping NURBS patches. The stiffeners are strategically positioned along the shared boundaries of neighboring patches, utilizing the identical control points that define these boundaries. Subsequently, the distinct patches are seamlessly integrated through the Nitsche method. Initially, the convergence of the proposed methodology is verified by the rectangular FGM plate without any stiffener and cutout under uniform temperature field. Consequently, we present an in-depth analysis of the free vibration of rectangular, skew, and elliptical FGM plates, exploring the effects of the stiffener orientation, the number and shape of cutouts, the boundary conditions of the plates, the gradient factor, temperature rise, and the type of thermal load on the free vibration characteristics. Through comparative analysis, the computed results are highly consistent with the data in existing literature, further validating the robustness of the proposed method.

{"title":"Thermal vibration of stiffened FGM plates with cutouts using Nitsche-based isogeometric approach","authors":"Yuan Wang , Bo Liu , Junjie Zhu , Wangfan Zhou , Libo Jiang , Chaofeng Pan , Jiangping Xu","doi":"10.1016/j.tws.2025.113026","DOIUrl":"10.1016/j.tws.2025.113026","url":null,"abstract":"<div><div>Based on the integration of first-order shear deformation concept and the principle of Timoshenko’s beam theory, we develop an isogeometric analysis (IGA) framework for the study of free vibration characteristics in stiffened functionally graded material (FGM) plates, both with and without stiffeners and cutouts, under three typical thermal loads. The framework introduces a physical neutral surface for a precise description of the material properties of FGM plate along the thickness direction. Initially, the stiffened FGM plates with or without cutouts, are modeled employing non-overlapping NURBS patches. The stiffeners are strategically positioned along the shared boundaries of neighboring patches, utilizing the identical control points that define these boundaries. Subsequently, the distinct patches are seamlessly integrated through the Nitsche method. Initially, the convergence of the proposed methodology is verified by the rectangular FGM plate without any stiffener and cutout under uniform temperature field. Consequently, we present an in-depth analysis of the free vibration of rectangular, skew, and elliptical FGM plates, exploring the effects of the stiffener orientation, the number and shape of cutouts, the boundary conditions of the plates, the gradient factor, temperature rise, and the type of thermal load on the free vibration characteristics. Through comparative analysis, the computed results are highly consistent with the data in existing literature, further validating the robustness of the proposed method.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113026"},"PeriodicalIF":5.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143322999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Thin-Walled Structures

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀