International Journal of Mechanical Sciences最新文献

Pulsed laser remelting non-resonant vibration assisted grinding Al-Si alloy

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-04-02 DOI: 10.1016/j.ijmecsci.2025.110226

Bin Fu , Yan Gu , Jieqiong Lin , Xiaoqin Zhou , Tianyu Gao , Jiali Wang , Lingling Han , Yongliang Zhang

High silicon aluminum alloy has broad applications in high power packaging parts and automobile lightweight. However, hard and brittle Si particles make the alloy surface easily to break during machining, resulting in serious surface defects. In this paper, a pulsed laser surface remelting non-resonant vibration assisted grinding method was proposed. The advantages of high instantaneous energy and quick cooling rate of pulsed laser are applied to form a remelting layer. The machinability of the alloy is improved by refining Si particles. The periodic separation of the workpiece-tool is used to reduce grinding forces and tool wear when abrasive particles cut the modified layer with higher hardness. The influence of remelting of the alloy induced by different power pulse laser on the material mechanical properties was revealed by laser irradiation experiments and indentation experiments. The influence mechanism of pulsed laser on the crystal structure and element distribution was simulated by molecular dynamics. The validity of the grinding method was confirmed by characterizing the grinding force, residual stress, tool wear, surface roughness and surface defect. The surface roughness of Al-27 wt. %Si decreased to 26 nm under the condition of 20 W power, 2 μm amplitude and 650 Hz frequency. The study reveals the deep mechanism of pulsed laser in laser assisted manufacturing and opens up a new research idea for the precise and low-damage processing of high silicon aluminum alloy.

{"title":"Pulsed laser remelting non-resonant vibration assisted grinding Al-Si alloy","authors":"Bin Fu , Yan Gu , Jieqiong Lin , Xiaoqin Zhou , Tianyu Gao , Jiali Wang , Lingling Han , Yongliang Zhang","doi":"10.1016/j.ijmecsci.2025.110226","DOIUrl":"10.1016/j.ijmecsci.2025.110226","url":null,"abstract":"<div><div>High silicon aluminum alloy has broad applications in high power packaging parts and automobile lightweight. However, hard and brittle Si particles make the alloy surface easily to break during machining, resulting in serious surface defects. In this paper, a pulsed laser surface remelting non-resonant vibration assisted grinding method was proposed. The advantages of high instantaneous energy and quick cooling rate of pulsed laser are applied to form a remelting layer. The machinability of the alloy is improved by refining Si particles. The periodic separation of the workpiece-tool is used to reduce grinding forces and tool wear when abrasive particles cut the modified layer with higher hardness. The influence of remelting of the alloy induced by different power pulse laser on the material mechanical properties was revealed by laser irradiation experiments and indentation experiments. The influence mechanism of pulsed laser on the crystal structure and element distribution was simulated by molecular dynamics. The validity of the grinding method was confirmed by characterizing the grinding force, residual stress, tool wear, surface roughness and surface defect. The surface roughness of Al-27 wt. %Si decreased to 26 nm under the condition of 20 W power, 2 μm amplitude and 650 Hz frequency. The study reveals the deep mechanism of pulsed laser in laser assisted manufacturing and opens up a new research idea for the precise and low-damage processing of high silicon aluminum alloy.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110226"},"PeriodicalIF":7.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785941","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

Ultra-broadband acoustic metaliner for fan noise reduction

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-04-02 DOI: 10.1016/j.ijmecsci.2025.110173

Tongwei Lu , Chun Liu , Nengyin Wang, Chen Shao, Yong Li

Fan noise, characterized by its broadband nature and spatial constraints, poses a significant challenge in noise control. Traditional acoustic liners, typically local, do not sufficiently address resonance mode coupling, rendering them inadequate for modern engineering requirements. Moreover, anti-resonance effects among these modes further weaken their broadband noise attenuation capability. By contrast, nonlocal metasurface liners employ global resonance modulation, allowing precise control of resonance mode coupling for improved noise attenuation. In this paper, we introduce an ultrathin nonlocal acoustic metaliner, designed via a mode matching method, which offers global resonance modulation and effectively suppresses anti-resonance between resonance modes, thereby mitigating broadband fan noise. Operating between 1000–5000

Hz

, the metaliner achieves a deep sub-wavelength thickness of just 20

mm

(

\sim λ / 17

). Fan tests indicate a 2.4

dB

reduction in total sound pressure levels in all directions. This approach highlights the practical applications of acoustic metamaterials, broadening their utility and enhancing noise control engineering.

{"title":"Ultra-broadband acoustic metaliner for fan noise reduction","authors":"Tongwei Lu , Chun Liu , Nengyin Wang, Chen Shao, Yong Li","doi":"10.1016/j.ijmecsci.2025.110173","DOIUrl":"10.1016/j.ijmecsci.2025.110173","url":null,"abstract":"<div><div>Fan noise, characterized by its broadband nature and spatial constraints, poses a significant challenge in noise control. Traditional acoustic liners, typically local, do not sufficiently address resonance mode coupling, rendering them inadequate for modern engineering requirements. Moreover, anti-resonance effects among these modes further weaken their broadband noise attenuation capability. By contrast, nonlocal metasurface liners employ global resonance modulation, allowing precise control of resonance mode coupling for improved noise attenuation. In this paper, we introduce an ultrathin nonlocal acoustic metaliner, designed via a mode matching method, which offers global resonance modulation and effectively suppresses anti-resonance between resonance modes, thereby mitigating broadband fan noise. Operating between 1000–5000 <span><math><mi>Hz</mi></math></span>, the metaliner achieves a deep sub-wavelength thickness of just 20 <span><math><mi>mm</mi></math></span> (<span><math><mrow><mo>∼</mo><mi>λ</mi><mo>/</mo><mn>17</mn></mrow></math></span>). Fan tests indicate a 2.4 <span><math><mi>dB</mi></math></span> reduction in total sound pressure levels in all directions. This approach highlights the practical applications of acoustic metamaterials, broadening their utility and enhancing noise control engineering.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110173"},"PeriodicalIF":7.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777064","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

Reconfigurable lattice structures with programmable deformation modes under electrothermal actuation

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-04-01 DOI: 10.1016/j.ijmecsci.2025.110212

Kai Zhang , Jinyu Ji , Dengbao Xiao , Xiaogang Guo , Daining Fang

Reconfigurable structures with programmable deformation behaviors present significant promise in fields of multifunctional antennas, flexible electronic device and soft robotics, for the capability of achieving multiple mechanical responses in a single structure. However, most previous researches have focused primarily on designing some basic deformation modes for the reconfigurable structures (i.e., shrinkage, expansion and simple shear deformation modes), which limits the exploration of a broader range of complex deformation modes in the reconfigurable structures. This study reports the design strategies for a class of reconfigurable three-phase lattice composite structures with programmable deformation modes under electrothermal actuation. The effective strain matrix is defined to characterize the finite deformation of the lattice composite structures. In addition to five basic deformation modes of the lattice composite structures, several coupled deformation modes are achieved in the lattice structures via specific actuation approaches, including bidirectional programmable shrinkage and expansion deformation, the coupled deformation modes of shearing and expansion or shrinkage. The two elements, and even three elements, of the effective strain matrices of the lattice structures are designed simultaneously, significantly enriching the deformation modes of the structures. A large deformation model is developed to describe the multiple deformation behaviors of the lattice composite structures, the accuracy of which is validated by the FEA and experimental results. Moreover, the experiments demonstrate that multiple deformation behaviors could be obtained in a single lattice composite structure by different actuation approaches. Therefore, this study offers insights for further studies into reconfigurable lattice structures with programmable deformation modes, and enhance the potential applications in fields of multifunctional antennas, flexible electronic device and reconfigurable soft robotic.

{"title":"Reconfigurable lattice structures with programmable deformation modes under electrothermal actuation","authors":"Kai Zhang , Jinyu Ji , Dengbao Xiao , Xiaogang Guo , Daining Fang","doi":"10.1016/j.ijmecsci.2025.110212","DOIUrl":"10.1016/j.ijmecsci.2025.110212","url":null,"abstract":"<div><div>Reconfigurable structures with programmable deformation behaviors present significant promise in fields of multifunctional antennas, flexible electronic device and soft robotics, for the capability of achieving multiple mechanical responses in a single structure. However, most previous researches have focused primarily on designing some basic deformation modes for the reconfigurable structures (i.e., shrinkage, expansion and simple shear deformation modes), which limits the exploration of a broader range of complex deformation modes in the reconfigurable structures. This study reports the design strategies for a class of reconfigurable three-phase lattice composite structures with programmable deformation modes under electrothermal actuation. The effective strain matrix is defined to characterize the finite deformation of the lattice composite structures. In addition to five basic deformation modes of the lattice composite structures, several coupled deformation modes are achieved in the lattice structures via specific actuation approaches, including bidirectional programmable shrinkage and expansion deformation, the coupled deformation modes of shearing and expansion or shrinkage. The two elements, and even three elements, of the effective strain matrices of the lattice structures are designed simultaneously, significantly enriching the deformation modes of the structures. A large deformation model is developed to describe the multiple deformation behaviors of the lattice composite structures, the accuracy of which is validated by the FEA and experimental results. Moreover, the experiments demonstrate that multiple deformation behaviors could be obtained in a single lattice composite structure by different actuation approaches. Therefore, this study offers insights for further studies into reconfigurable lattice structures with programmable deformation modes, and enhance the potential applications in fields of multifunctional antennas, flexible electronic device and reconfigurable soft robotic.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110212"},"PeriodicalIF":7.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761119","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

Investigation of dynamic fractures under varying stress states

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-04-01 DOI: 10.1016/j.ijmecsci.2025.110177

Yi Shen, Tianbao Ma, Jianqiao Li

The dynamic fracture behaviours of metallic materials vary significantly under different stress states, and the study on them is of great significance in guiding the design of engineering structures and improving their fracture resistance. To investigate the effect of the stress state on dynamic fractures, five newly designed specimens were proposed to produce different loading states, and the investigation was conducted using the traditional Split Hopkinson Pressure Bar (SHPB) device. In this study, the macroscopic fracture behaviour and microscopic void morphology were analysed under different loading rates and stress states. Subsequently, dynamic fractures under different stress states were investigated via numerical simulations using different damage models. Finally, the effects of specimen factors on the reliability of studying dynamic fractures using the newly proposed method were analysed using both experimental and numerical methods. All the results confirmed that the proposed experimental method is effective and simple for studying dynamic fractures under shear-to tensile-dominated states. The stress states are stable and controllable by changing the specimen shape. Moreover, both the microscopic void coalescence orientation and macroscopic fracture features are determined by the competition between the tensile and shear stresses. The proposed experimental method provides a new and reliable method for testing dynamic fracture behaviour of typical metallic materials under shear- to tensile-dominated states using the traditional SHPB device.

{"title":"Investigation of dynamic fractures under varying stress states","authors":"Yi Shen, Tianbao Ma, Jianqiao Li","doi":"10.1016/j.ijmecsci.2025.110177","DOIUrl":"10.1016/j.ijmecsci.2025.110177","url":null,"abstract":"<div><div>The dynamic fracture behaviours of metallic materials vary significantly under different stress states, and the study on them is of great significance in guiding the design of engineering structures and improving their fracture resistance. To investigate the effect of the stress state on dynamic fractures, five newly designed specimens were proposed to produce different loading states, and the investigation was conducted using the traditional Split Hopkinson Pressure Bar (SHPB) device. In this study, the macroscopic fracture behaviour and microscopic void morphology were analysed under different loading rates and stress states. Subsequently, dynamic fractures under different stress states were investigated via numerical simulations using different damage models. Finally, the effects of specimen factors on the reliability of studying dynamic fractures using the newly proposed method were analysed using both experimental and numerical methods. All the results confirmed that the proposed experimental method is effective and simple for studying dynamic fractures under shear-to tensile-dominated states. The stress states are stable and controllable by changing the specimen shape. Moreover, both the microscopic void coalescence orientation and macroscopic fracture features are determined by the competition between the tensile and shear stresses. The proposed experimental method provides a new and reliable method for testing dynamic fracture behaviour of typical metallic materials under shear- to tensile-dominated states using the traditional SHPB device.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110177"},"PeriodicalIF":7.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761120","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

Multifunctional TPMS-based metastructures

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-31 DOI: 10.1016/j.ijmecsci.2025.110208

Linjie Jian , Junfeng He , Guilin Wen , Zhen-Pei Wang , Jie Yang , Yi Min Xie , Jie Liu

Addressing the dual demands of concurrent low-frequency noise suppression and superior mechanical performance in lightweight structures remains a critical engineering challenge. This study proposes an innovative design and optimization strategy for novel multifunctional TPMS-based metastructures, enabling synergistic enhancement of both acoustic and mechanical functionalities. Two types of multifunctional TPMS-based metastructures, designated as Types A and B, are constructed with thickened triple periodic minimal surfaces (TPMS), micro-perforated panels (MPP), and solid panels (SP). The acoustics and mechanical performance of the proposed metastructures are quantified by the sound absorption coefficient and the equivalent bending stiffness, respectively. Subsequently, an optimization framework integrating a non-dominated sorting genetic algorithm II (NSGA-II) is developed to optimize low-frequency sound absorption bandwidth and equivalent bending stiffness. With the optimized configuration, Type A achieves effective sound absorption at 343–579 Hz (absorption coefficient α > 0.8) and an equivalent bending stiffness of 5.96. Additionally, we reveal the sound absorption mechanism by normalized acoustic resistance and normalized acoustic reactance as well as vibration velocity and acoustic energy dissipation density of the air particles inside the micro-perforations. A sound absorption theoretical model for the multifunctional TPMS-based metastructures is developed via the electro-acoustic analogy method and verified by finite element and experimental approaches. The equivalent bending stiffness is obtained through finite element and experimental. In addition, we have investigated the effect of geometrical parameters on the sound absorption coefficient and the equivalent bending stiffness. This study offers a novel approach to the multifunctional design of lightweight structures.

{"title":"Multifunctional TPMS-based metastructures","authors":"Linjie Jian , Junfeng He , Guilin Wen , Zhen-Pei Wang , Jie Yang , Yi Min Xie , Jie Liu","doi":"10.1016/j.ijmecsci.2025.110208","DOIUrl":"10.1016/j.ijmecsci.2025.110208","url":null,"abstract":"<div><div>Addressing the dual demands of concurrent low-frequency noise suppression and superior mechanical performance in lightweight structures remains a critical engineering challenge. This study proposes an innovative design and optimization strategy for novel multifunctional TPMS-based metastructures, enabling synergistic enhancement of both acoustic and mechanical functionalities. Two types of multifunctional TPMS-based metastructures, designated as Types A and B, are constructed with thickened triple periodic minimal surfaces (TPMS), micro-perforated panels (MPP), and solid panels (SP). The acoustics and mechanical performance of the proposed metastructures are quantified by the sound absorption coefficient and the equivalent bending stiffness, respectively. Subsequently, an optimization framework integrating a non-dominated sorting genetic algorithm II (NSGA-II) is developed to optimize low-frequency sound absorption bandwidth and equivalent bending stiffness. With the optimized configuration, Type A achieves effective sound absorption at 343–579 Hz (absorption coefficient <em>α</em> > 0.8) and an equivalent bending stiffness of 5.96. Additionally, we reveal the sound absorption mechanism by normalized acoustic resistance and normalized acoustic reactance as well as vibration velocity and acoustic energy dissipation density of the air particles inside the micro-perforations. A sound absorption theoretical model for the multifunctional TPMS-based metastructures is developed via the electro-acoustic analogy method and verified by finite element and experimental approaches. The equivalent bending stiffness is obtained through finite element and experimental. In addition, we have investigated the effect of geometrical parameters on the sound absorption coefficient and the equivalent bending stiffness. This study offers a novel approach to the multifunctional design of lightweight structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110208"},"PeriodicalIF":7.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768654","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

Quantifying the influence of textile fibre characteristics on drying-induced moisture transportation in textile fibre reinforced concrete

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-31 DOI: 10.1016/j.ijmecsci.2025.110207

Hasika Dharmasooriya, Yuguo Yu, Chamila Gunasekara, Dilan J. Robert, Sujeeva Setunge

This study presents a computational framework to determine time-dependent relative humidity transport coefficients in Textile Fibre-Reinforced Concrete (TFRC) made with cement and fly ash binders. These coefficients, influenced by capillary pore (CP) connectivity, depend on porosity and microstructural changes caused by textile fibre inclusions. Porosity evolution and CP connectivity are modelled by integrating hydration analysis with mixed effective medium theory, capturing the time-dependent transport properties across hierarchical concrete scales. The intrinsic relative humidity transport coefficient is derived to represent moisture transport mechanisms. A novel percolation function that quantifies CP connectivity changes induced by textile fibres is developed. This function links fibre characteristics to microstructural modifications, providing quantitative insights into reduced pore connectivity and enhanced drying resistance in TFRC. The findings reveal that textile fibres can reduce pore connectivity by up to 75 %, with fibre volumes below 0.5 % offering optimal drying resistance. The framework also optimises fibre content to improve water retention in TFRC under environmental drying. This model lays the groundwork for analysing drying shrinkage and improving the durability of TFRC in practical applications, addressing the long-term performance requirements of fibre-reinforced cementitious composites.

{"title":"Quantifying the influence of textile fibre characteristics on drying-induced moisture transportation in textile fibre reinforced concrete","authors":"Hasika Dharmasooriya, Yuguo Yu, Chamila Gunasekara, Dilan J. Robert, Sujeeva Setunge","doi":"10.1016/j.ijmecsci.2025.110207","DOIUrl":"10.1016/j.ijmecsci.2025.110207","url":null,"abstract":"<div><div>This study presents a computational framework to determine time-dependent relative humidity transport coefficients in Textile Fibre-Reinforced Concrete (TFRC) made with cement and fly ash binders. These coefficients, influenced by capillary pore (CP) connectivity, depend on porosity and microstructural changes caused by textile fibre inclusions. Porosity evolution and CP connectivity are modelled by integrating hydration analysis with mixed effective medium theory, capturing the time-dependent transport properties across hierarchical concrete scales. The intrinsic relative humidity transport coefficient is derived to represent moisture transport mechanisms. A novel percolation function that quantifies CP connectivity changes induced by textile fibres is developed. This function links fibre characteristics to microstructural modifications, providing quantitative insights into reduced pore connectivity and enhanced drying resistance in TFRC. The findings reveal that textile fibres can reduce pore connectivity by up to 75 %, with fibre volumes below 0.5 % offering optimal drying resistance. The framework also optimises fibre content to improve water retention in TFRC under environmental drying. This model lays the groundwork for analysing drying shrinkage and improving the durability of TFRC in practical applications, addressing the long-term performance requirements of fibre-reinforced cementitious composites.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110207"},"PeriodicalIF":7.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777063","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

Brittle–ductile transition model for ultrasonic vibration–assisted blade dicing

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-31 DOI: 10.1016/j.ijmecsci.2025.110196

Hanwei Teng , Shuo Chen , Rendi Kurniawan , Shujian Li , Changping Li , Moran Xu , Jielin Chen , Tae Jo Ko

The critical machining parameters of the brittle–ductile transition (BDT) play a crucial role in enabling ductile-mode machining of brittle materials. Ultrasonic vibration–assisted blade dicing (UVABD) enhances machining quality significantly compared to conventional dicing methods. Nevertheless, radial ultrasonic vibration complicates the motion trajectories of the irregular grains on the dicing saw, making it difficult to predict the critical machining parameters. A comprehensive model that can predict critical machining parameters for BDT in UVABD has yet to be developed. In this paper, a mathematical model is proposed to predict the critical machining parameters for BDT in UVABD, considering the actual grain geometric characteristics and the interactions among multiple grains affected by ultrasonic vibration. The model was validated through experiments on single-crystal silicon wafers. A combined numerical and experimental method was used to comprehensively investigate the critical machining parameters for BDT. The results indicate that material removal in UVABD primarily involves plastic ploughing and brittle fracture. The proposed model's predictions agreed well with the experimental results, with the average relative error being 10.7 %. Finally, the model was applied to examine how machining parameters influence the critical machining parameters for BDT. Higher spindle speeds and vibration amplitudes, combined with lower feed rates and dicing depths, were found to facilitate the realization of ductile machining. This study establishes a theoretical foundation for ductile machining in UVABD and offers new insights into the BDT mechanism of brittle materials under UVABD.

{"title":"Brittle–ductile transition model for ultrasonic vibration–assisted blade dicing","authors":"Hanwei Teng , Shuo Chen , Rendi Kurniawan , Shujian Li , Changping Li , Moran Xu , Jielin Chen , Tae Jo Ko","doi":"10.1016/j.ijmecsci.2025.110196","DOIUrl":"10.1016/j.ijmecsci.2025.110196","url":null,"abstract":"<div><div>The critical machining parameters of the brittle–ductile transition (BDT) play a crucial role in enabling ductile-mode machining of brittle materials. Ultrasonic vibration–assisted blade dicing (UVABD) enhances machining quality significantly compared to conventional dicing methods. Nevertheless, radial ultrasonic vibration complicates the motion trajectories of the irregular grains on the dicing saw, making it difficult to predict the critical machining parameters. A comprehensive model that can predict critical machining parameters for BDT in UVABD has yet to be developed. In this paper, a mathematical model is proposed to predict the critical machining parameters for BDT in UVABD, considering the actual grain geometric characteristics and the interactions among multiple grains affected by ultrasonic vibration. The model was validated through experiments on single-crystal silicon wafers. A combined numerical and experimental method was used to comprehensively investigate the critical machining parameters for BDT. The results indicate that material removal in UVABD primarily involves plastic ploughing and brittle fracture. The proposed model's predictions agreed well with the experimental results, with the average relative error being 10.7 %. Finally, the model was applied to examine how machining parameters influence the critical machining parameters for BDT. Higher spindle speeds and vibration amplitudes, combined with lower feed rates and dicing depths, were found to facilitate the realization of ductile machining. This study establishes a theoretical foundation for ductile machining in UVABD and offers new insights into the BDT mechanism of brittle materials under UVABD.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110196"},"PeriodicalIF":7.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785897","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

Analytical model of CFRP cutting mechanics with strain rate effect

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-31 DOI: 10.1016/j.ijmecsci.2025.110206

Zhenghui Lu, Xiaoliang Jin

When machining carbon fiber reinforced polymer (CFRP), the effect of strain rate on chip formation as fiber orientation and cutting speed change remains unclear, although it is recognized that the mechanical properties of CFRP are sensitive to strain rate. This paper provides a new analytical model to predict chip formation and associated cutting forces for CFRP. The changing cutting strain rate and stress states of varying fiber orientations are modeled, and the variation of CFRP strength due to strain rate is incorporated into selected composite failure criteria for determining material failure mode in cutting. Orthogonal cutting experiments were conducted on CFRP workpieces with distinct fiber orientations to validate the model. It is found that the model can capture the experimental cutting forces for CFRP workpieces with different fiber orientations across the full range [0°, 180°] at different cutting speeds. The simulations show that, due to the cutting strain rate, the strengths of CFRP in different loading directions can increase by up to 2.8 times compared to corresponding quasi-static strengths for varying fiber orientations at cutting speed 100 m/min. However, the sensitivity of cutting forces with the strain rate highly depends on the fiber orientation. As the fiber orientation varies, four distinct failure cases are classified based on the simulated different situations of strain rate-induced strength enhancement and stress-based failure modes. The simulated transitions of the failure cases explain the variations of experimental cutting forces. This work provides a new understanding of the CFRP cutting mechanism with strain rate effect.

{"title":"Analytical model of CFRP cutting mechanics with strain rate effect","authors":"Zhenghui Lu, Xiaoliang Jin","doi":"10.1016/j.ijmecsci.2025.110206","DOIUrl":"10.1016/j.ijmecsci.2025.110206","url":null,"abstract":"<div><div>When machining carbon fiber reinforced polymer (CFRP), the effect of strain rate on chip formation as fiber orientation and cutting speed change remains unclear, although it is recognized that the mechanical properties of CFRP are sensitive to strain rate. This paper provides a new analytical model to predict chip formation and associated cutting forces for CFRP. The changing cutting strain rate and stress states of varying fiber orientations are modeled, and the variation of CFRP strength due to strain rate is incorporated into selected composite failure criteria for determining material failure mode in cutting. Orthogonal cutting experiments were conducted on CFRP workpieces with distinct fiber orientations to validate the model. It is found that the model can capture the experimental cutting forces for CFRP workpieces with different fiber orientations across the full range [0°, 180°] at different cutting speeds. The simulations show that, due to the cutting strain rate, the strengths of CFRP in different loading directions can increase by up to 2.8 times compared to corresponding quasi-static strengths for varying fiber orientations at cutting speed 100 m/min. However, the sensitivity of cutting forces with the strain rate highly depends on the fiber orientation. As the fiber orientation varies, four distinct failure cases are classified based on the simulated different situations of strain rate-induced strength enhancement and stress-based failure modes. The simulated transitions of the failure cases explain the variations of experimental cutting forces. This work provides a new understanding of the CFRP cutting mechanism with strain rate effect.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"293 ","pages":"Article 110206"},"PeriodicalIF":7.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785940","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

Nonlinear vibration of corrugated-honeycomb cylindrical shells in thermal environments

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-30 DOI: 10.1016/j.ijmecsci.2025.110200

Bocheng Dong, Rui Zhao, Kaiping Yu

To balance the weight-saving and mechanical compensation features of lightweight engineering structures, fresh composite sandwich cylindrical shells with three-phase hybrid composite skins and a corrugated core filled with hexagonal honeycombs are designed. A matched dynamic model is first proposed to disclose the nonlinear vibration behaviors, including the nonlinear frequency, the amplitude-frequency attribute, and the phase plane manifestation during primary, sub-harmonic, and super-harmonic resonance occurrences, while the thermal effect is taken into account. The equivalent stiffness parameters of the core are derived using the strain energy invariance principle at macro and micro scales, and the variable material properties of the three-phase hybrid composite skins incorporating material-filled defects are characterized through the Halpin-Tsai technique and mixture law. The first-order shear deformation theory merging geometric large deformations and the Euler-Lagrange equation is adopted to integrate the modeling framework, in which the thermal expansions induced by temperature climbs are given via Green-Lagrange nonlinear strains, and the static condensation and time-domain multiscale methods achieve nonlinear vibration solutions. After the model is proven to work, the nonlinear frequency and various harmonic resonance behaviors are characterized under different configuration schemes and heat impacts, with the influence mechanisms being elucidated. Some actionable guidelines for improving the dynamic capabilities of the structure are provided.

为了兼顾轻质工程结构的减重和机械补偿特性，设计了带有三相混合复合材料表皮和填充六角形蜂窝的波纹芯的新鲜复合材料夹层圆柱壳。首先提出了一个匹配的动力学模型，以揭示非线性振动行为，包括发生主谐振、次谐振和超谐振时的非线性频率、幅频属性和相位平面表现，同时考虑了热效应。利用应变能不变原理推导出了宏观和微观尺度上的核心等效刚度参数，并通过 Halpin-Tsai 技术和混合定律表征了包含材料填充缺陷的三相混合复合材料表皮的可变材料特性。采用融合几何大变形和欧拉-拉格朗日方程的一阶剪切变形理论整合建模框架，其中温度上升引起的热膨胀通过格林-拉格朗日非线性应变给出，静态凝聚和时域多尺度方法实现非线性振动求解。在证明模型可行后，对不同配置方案和热影响下的非线性频率和各种谐波共振行为进行了表征，并阐明了影响机制。为提高结构的动态能力提供了一些可行的指导原则。

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引用次数: 0

Generation of micro-textures by three-dimensional vibration-assisted fly cutting

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2025-03-30 DOI: 10.1016/j.ijmecsci.2025.110179

Guoqing Zhang , Minghua Pan , Shuaikang Cao , Zejia Huang , Yuting Ma

Micro-nano textured surfaces exhibit unique functional properties and therefore are extensively applied in the industrial fields such as healthcare and defense. Generally, ultra-precision machining is believed to be an ideal means for fabricating micro-nano textured, especially for vibration-assisted single-point diamond turning. However, vibration-assisted single-point diamond turning also presents challenges in machining micro-grooved or micro-textured surfaces, especially with high curvature properties. Therefore, the present study developed a three-dimensional vibration-assisted fly cutting system to machine micro-texture surfaces. First, a novel three-dimensional vibration platform was designed and utilized to generate the required vibration for modulation the fly cutting tool path, whereby a three-dimensional (X/Y/Z) vibration-assisted fly cutting system is developed by integrating the modified tool offset fly cutting machine tool. Then, by employing the vibration-assisted fly cutting system, sinusoidal excitation signals in the X, Y, and Z directions are generated and combined to create convex bamboo-like micro-textures, concave-convex micro-textures, concave bamboo-like micro-textures, and concave-convex bamboo-like micro-textures. Finally, an analysis of the influencing factors for the generation of concave-convex bamboo-like micro-textures was conducted, and relevant conclusions were drawn. Research results show that by varying the frequency and initial phase of the sinusoidal excitation signals, concave-convex bamboo-like micro-textures with different boundary characteristics were obtained; by adjusting the cutting depth of the tool, concave-convex bamboo-like micro-textures with varying morphologies were achieved. The micro-textured surfaces prepared in this study exhibit excellent surface morphology, proving the effectiveness and reliability of the machining system, which provides valuable insights for the fabrication of micro-textures.

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引用次数: 0