Pub Date : 2023-10-20DOI: 10.1142/s1758825124500170
Lei Liu, Bo Zhou, Xiuxing Zhu, Haijing Wang, Yun Huang
{"title":"Thermodynamic constitutive model of the gas hydrate bearing sediments considering anisotropy","authors":"Lei Liu, Bo Zhou, Xiuxing Zhu, Haijing Wang, Yun Huang","doi":"10.1142/s1758825124500170","DOIUrl":"https://doi.org/10.1142/s1758825124500170","url":null,"abstract":"","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"36 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1142/s1758825124500182
S. W. Yuan, J. X. Hou, H. C. Zhu, J. L. Liao
{"title":"Acoustic characteristics of a plate silencer with a flexible back cavity under arbitrary boundary conditions","authors":"S. W. Yuan, J. X. Hou, H. C. Zhu, J. L. Liao","doi":"10.1142/s1758825124500182","DOIUrl":"https://doi.org/10.1142/s1758825124500182","url":null,"abstract":"","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-19DOI: 10.1142/s1758825124500078
Yan Lu, Yibo Li, Qiang Yue, Jingsong Liu, Yong Zhang, Lei Dong
An anisotropic visco-hyperelastic constitutive model for rate-temperature-dependent deformation during one-step hot stamping forming simulation of unidirectional (UD) CF/PEEK prepregs is presented. This constitutive model is based on strain energy decomposition and a multiplicative decomposition of the deformation gradient. Two simple Maxwell models are used to characterize the viscoelastic behavior of the melted PEEK matrix and longitudinal shear deformation, respectively, and a shear invariant of [Formula: see text] is proposed to calculate the shear deformation. Moreover, the fiber stretching deformation is modeled by an anisotropic hyperelastic model. To obtain the model parameters, tensile tests at different strain rates and temperatures above the melt temperature of PEEK are performed on [Formula: see text], [Formula: see text], and [Formula: see text] CF/PEEK prepreg specimens, respectively. In parallel, the [0] 8 and [45] 8 curved beam specimens are experimentally fabricated to validate the constitutive model. The VUMAT subroutine is developed according to the proposed constitutive model and applied for a [Formula: see text] off-axis tensile simulation and hot-stamping forming simulation of CF/PEEK prepregs. The experimental and simulation results show that the materials flow, distribution of strain and stress, forming defects (wrinkles and overlap) of CF/PEEK curved beam can be captured by the proposed model.
{"title":"A Rate-temperature-dependent Visco-hyperelastic Constitutive Model for UD CF/PEEK Prepregs During a One-Step Hot Stamping Forming Process","authors":"Yan Lu, Yibo Li, Qiang Yue, Jingsong Liu, Yong Zhang, Lei Dong","doi":"10.1142/s1758825124500078","DOIUrl":"https://doi.org/10.1142/s1758825124500078","url":null,"abstract":"An anisotropic visco-hyperelastic constitutive model for rate-temperature-dependent deformation during one-step hot stamping forming simulation of unidirectional (UD) CF/PEEK prepregs is presented. This constitutive model is based on strain energy decomposition and a multiplicative decomposition of the deformation gradient. Two simple Maxwell models are used to characterize the viscoelastic behavior of the melted PEEK matrix and longitudinal shear deformation, respectively, and a shear invariant of [Formula: see text] is proposed to calculate the shear deformation. Moreover, the fiber stretching deformation is modeled by an anisotropic hyperelastic model. To obtain the model parameters, tensile tests at different strain rates and temperatures above the melt temperature of PEEK are performed on [Formula: see text], [Formula: see text], and [Formula: see text] CF/PEEK prepreg specimens, respectively. In parallel, the [0] 8 and [45] 8 curved beam specimens are experimentally fabricated to validate the constitutive model. The VUMAT subroutine is developed according to the proposed constitutive model and applied for a [Formula: see text] off-axis tensile simulation and hot-stamping forming simulation of CF/PEEK prepregs. The experimental and simulation results show that the materials flow, distribution of strain and stress, forming defects (wrinkles and overlap) of CF/PEEK curved beam can be captured by the proposed model.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135667439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-14DOI: 10.1142/s1758825124500054
Han Dong, Han Wang, Zhenwei Cai, Weizhe Wang, Yingzheng Liu
A coupling model of peridynamics and finite element method is proposed to study the interfacial delamination influenced by vertical crack density in thermal barrier coating (TBC) systems. Specifically, the progressive failure progress under static and fatigue loads in TBCs, including vertical cracks propagation, the evolution of vertical cracks to interfacial cracks, and interfacial delamination, is simulated by the proposed model. The difference between static failure mechanism and fatigue failure mechanism of TBCs is numerically elucidated. The simulated fracture morphology is in good agreement with the experiential observation. In both static and fatigue loads, a higher vertical crack density is found to correspond to a shorter delamination length, and there is no interfacial delamination when the vertical crack density is high enough. The results provide important insight of vertical crack density on interfacial delamination, and the durability of TBCs can be enhanced by ensuring an appropriately high vertical crack density.
{"title":"Peridynamics–FEM coupling for interfacial delamination effected by vertical crack density in thermal barrier coatings","authors":"Han Dong, Han Wang, Zhenwei Cai, Weizhe Wang, Yingzheng Liu","doi":"10.1142/s1758825124500054","DOIUrl":"https://doi.org/10.1142/s1758825124500054","url":null,"abstract":"A coupling model of peridynamics and finite element method is proposed to study the interfacial delamination influenced by vertical crack density in thermal barrier coating (TBC) systems. Specifically, the progressive failure progress under static and fatigue loads in TBCs, including vertical cracks propagation, the evolution of vertical cracks to interfacial cracks, and interfacial delamination, is simulated by the proposed model. The difference between static failure mechanism and fatigue failure mechanism of TBCs is numerically elucidated. The simulated fracture morphology is in good agreement with the experiential observation. In both static and fatigue loads, a higher vertical crack density is found to correspond to a shorter delamination length, and there is no interfacial delamination when the vertical crack density is high enough. The results provide important insight of vertical crack density on interfacial delamination, and the durability of TBCs can be enhanced by ensuring an appropriately high vertical crack density.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135767372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper investigates the effects of a foundation movement on the vibration instability of axial-field permanent magnet motors (AFPMM). Different from previous studies focusing on the effects of the rotor’s rotation on its vibration instability, this paper introduces a revolution around a space axis as the foundation movement and investigates its effect on the vibration characteristics of the rotor. For an annular rotor with this foundation movement and a rotation around an axis passing through its own geometrical center, a dynamic model is established in this paper. Magnet-field-synchronous frame is introduced to describe the out-of-plane displacement. Hamilton’s principle and Galerkin method are involved to obtain dynamic mode. Closed-form expressions of eigenvalues and the boundaries of flutter and divergent instabilities are determined. The analytical results claim that the instabilities can be suppressed. Particularly, the divergent instabilities can even be eliminated by adjusting combinations of parameters. To verify the results, the stability analyses and numerical calculations regarding the revolution are given for a sample AFPMM revolving around a space axis at different speeds. Based on these analytical boundaries, the unstable regions of a sample motor with different parameter combinations are plotted in terms of foundation movement, which can be used to suppress the vibration instabilities with the design of parameters such as rotation speed, web thickness, magnetization thickness, air-gap length and remanence. Six states of instabilities are summarized as a guidance to determine the range of the stable operation of the motor.
{"title":"Vibration Instability of a Rotor in Axial-Field Permanent Magnet Motors with a Foundation Movement","authors":"Chunhua Xia, Shiyu Wang, Jixiang Wang, Zhenhang Wei","doi":"10.1142/s1758825124500042","DOIUrl":"https://doi.org/10.1142/s1758825124500042","url":null,"abstract":"This paper investigates the effects of a foundation movement on the vibration instability of axial-field permanent magnet motors (AFPMM). Different from previous studies focusing on the effects of the rotor’s rotation on its vibration instability, this paper introduces a revolution around a space axis as the foundation movement and investigates its effect on the vibration characteristics of the rotor. For an annular rotor with this foundation movement and a rotation around an axis passing through its own geometrical center, a dynamic model is established in this paper. Magnet-field-synchronous frame is introduced to describe the out-of-plane displacement. Hamilton’s principle and Galerkin method are involved to obtain dynamic mode. Closed-form expressions of eigenvalues and the boundaries of flutter and divergent instabilities are determined. The analytical results claim that the instabilities can be suppressed. Particularly, the divergent instabilities can even be eliminated by adjusting combinations of parameters. To verify the results, the stability analyses and numerical calculations regarding the revolution are given for a sample AFPMM revolving around a space axis at different speeds. Based on these analytical boundaries, the unstable regions of a sample motor with different parameter combinations are plotted in terms of foundation movement, which can be used to suppress the vibration instabilities with the design of parameters such as rotation speed, web thickness, magnetization thickness, air-gap length and remanence. Six states of instabilities are summarized as a guidance to determine the range of the stable operation of the motor.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135767365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-13DOI: 10.1142/s1758825124500169
Huili Guo, Fulin Shang, Tianhu He
{"title":"Fractional-Order Rate-Dependent Piezoelectric Thermoelasticity Theory Based on new Fractional Derivatives and its Application in Structural Transient Responses Analysis of Smart Piezoelectric Composite Laminates","authors":"Huili Guo, Fulin Shang, Tianhu He","doi":"10.1142/s1758825124500169","DOIUrl":"https://doi.org/10.1142/s1758825124500169","url":null,"abstract":"","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135918020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-13DOI: 10.1142/s1758825124500157
Asesh Kumar Patra, Aman Khurana, Deepak Kumar
{"title":"Modeling and analysis of a thermo-electro-magneto-viscoelastic actuator","authors":"Asesh Kumar Patra, Aman Khurana, Deepak Kumar","doi":"10.1142/s1758825124500157","DOIUrl":"https://doi.org/10.1142/s1758825124500157","url":null,"abstract":"","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135918161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-06DOI: 10.1142/s175882512450011x
Guo-Peng Bai, Guo-Kang Er, Vai Pan Iu, Chi Chiu Lam
{"title":"Optimization-oriented EPC approach for analyzing the stochastic nonlinear oscillators with displacement-multiplicative and additive excitations","authors":"Guo-Peng Bai, Guo-Kang Er, Vai Pan Iu, Chi Chiu Lam","doi":"10.1142/s175882512450011x","DOIUrl":"https://doi.org/10.1142/s175882512450011x","url":null,"abstract":"","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135303336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, by breaking the structural six-fold symmetry and isotropy, we propose a simple design to drastically improve the elastic deformability and stiffness of gardenia-shaped honeycomb (GSH) structures, with a lower structural relative density. In the developed structural design, the enhancement of the mechanical response is achieved by locally shortening the beams that caused the intracellular extrusion. Studies that focused on simultaneously strengthening the two above-mentioned characteristics are rarely seen. Unlike the isotropy of the previous GSH structures, the elastic modulus of the reinforced GSH (RGSH) structures in both two principal directions is investigated via performing a complete parametric study. To visualize the utterly different mechanical response between the GSH and RGSH structures, the elastic properties-comparison are presented theoretically, numerically, and experimentally. The developed structural reinforcing method, combining the stiffness and deformability regulation, provides a valuable way to redesign multifunctional lattice structures for meeting the various requirements regarding mechanical characteristics.
{"title":"An anisotropy honeycomb structure with reinforced deformability and stiffness","authors":"Ning Feng, Shangbin Wang, Yuanhao Tie, Andras Biczo, Chongfu Huang, Weibo Xie","doi":"10.1142/s1758825124500066","DOIUrl":"https://doi.org/10.1142/s1758825124500066","url":null,"abstract":"In this work, by breaking the structural six-fold symmetry and isotropy, we propose a simple design to drastically improve the elastic deformability and stiffness of gardenia-shaped honeycomb (GSH) structures, with a lower structural relative density. In the developed structural design, the enhancement of the mechanical response is achieved by locally shortening the beams that caused the intracellular extrusion. Studies that focused on simultaneously strengthening the two above-mentioned characteristics are rarely seen. Unlike the isotropy of the previous GSH structures, the elastic modulus of the reinforced GSH (RGSH) structures in both two principal directions is investigated via performing a complete parametric study. To visualize the utterly different mechanical response between the GSH and RGSH structures, the elastic properties-comparison are presented theoretically, numerically, and experimentally. The developed structural reinforcing method, combining the stiffness and deformability regulation, provides a valuable way to redesign multifunctional lattice structures for meeting the various requirements regarding mechanical characteristics.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136271687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：