Mechanics of Materials最新文献

英文中文

3D auxetic metamaterials with tunable multistable mechanical properties

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105217

Bojian Zhang , Zhiqiang Meng , Yifan Wang

Multistable mechanical metamaterials have been extensively studied for their unique mechanical behaviors, including snap-through capability, variable stiffness, and recoverable cushioning properties. Similarly, auxetic metamaterials, known for their ability to uniformly distribute stress, absorb energy efficiently, and withstand complex loading conditions, offer significant potential for the development of safer, more durable, and efficient materials. Despite significant progress in the field, a key challenge remains unaddressed: the effective integration of both multistability and auxetic properties in 3-dimensional (3D) mechanical metamaterials. This integration has not been fully explored, particularly regarding the realization of programmable, directionally tunable behaviors that combine the advantages of a negative Poisson's ratio and multiple stable states. Here, we introduce a 3D mechanical metamaterial composed of isotropic bistable auxetic blocks (BABs) fabricated using bi-material 3D printing technology. Mechanical models are developed to assess the influence of geometrical parameters on the mechanical responses of BAB, which are validated through both numerical simulation and experimental results. By assembling these proposed BABs, we demonstrate that 3D mechanical metamaterials with multistable auxetic behavior can be designed and fabricated. Our results show that these metamaterials exhibit sequential deformation under applied loading and possess programmable mechanical properties. These findings open new avenues for the design and development of 3D multistable auxetic metamaterials with programmable mechanical behaviors, offering promising applications in areas such as energy absorption, deployable structures, soft robotics, and more.

{"title":"3D auxetic metamaterials with tunable multistable mechanical properties","authors":"Bojian Zhang , Zhiqiang Meng , Yifan Wang","doi":"10.1016/j.mechmat.2024.105217","DOIUrl":"10.1016/j.mechmat.2024.105217","url":null,"abstract":"<div><div>Multistable mechanical metamaterials have been extensively studied for their unique mechanical behaviors, including snap-through capability, variable stiffness, and recoverable cushioning properties. Similarly, auxetic metamaterials, known for their ability to uniformly distribute stress, absorb energy efficiently, and withstand complex loading conditions, offer significant potential for the development of safer, more durable, and efficient materials. Despite significant progress in the field, a key challenge remains unaddressed: the effective integration of both multistability and auxetic properties in 3-dimensional (3D) mechanical metamaterials. This integration has not been fully explored, particularly regarding the realization of programmable, directionally tunable behaviors that combine the advantages of a negative Poisson's ratio and multiple stable states. Here, we introduce a 3D mechanical metamaterial composed of isotropic bistable auxetic blocks (BABs) fabricated using bi-material 3D printing technology. Mechanical models are developed to assess the influence of geometrical parameters on the mechanical responses of BAB, which are validated through both numerical simulation and experimental results. By assembling these proposed BABs, we demonstrate that 3D mechanical metamaterials with multistable auxetic behavior can be designed and fabricated. Our results show that these metamaterials exhibit sequential deformation under applied loading and possess programmable mechanical properties. These findings open new avenues for the design and development of 3D multistable auxetic metamaterials with programmable mechanical behaviors, offering promising applications in areas such as energy absorption, deployable structures, soft robotics, and more.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105217"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An FFT based chemo-mechanical framework with fracture: Application to mesoscopic electrode degradation

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105211

Gabriel Zarzoso , Eduardo Roque , Francisco Montero-Chacón , Javier Segurado

An FFT based method is proposed to simulate chemo-mechanical problems at the microscale including fracture, specially suited to predict crack formation during the intercalation process in batteries. The method involves three fields fully coupled, concentration, deformation gradient and damage. The mechanical problem is set in a finite strain framework and solved using Fourier Galerkin for non-linear problems in finite strains. The damage is modeled with Phase Field Fracture using a stress driving force. This problem is solved in Fourier space using conjugate gradient with an ad-hoc preconditioner. The chemical problem is modeled with the second Fick’s law and physically based chemical potentials, is integrated using backward Euler and is solved by Newton–Raphson combined with a conjugate gradient solver. Buffer layers are introduced to break the periodicity and emulate Neumann boundary conditions for incoming mass flux. The framework is validated against Finite Elements the results of both methods are very close in all the cases. Finally, the framework is used to simulate the fracture of active particles of graphite during ion intercalation. The method is able to solve large problems at a reduced computational cost and reproduces the shape of the cracks observed in real particles.

{"title":"An FFT based chemo-mechanical framework with fracture: Application to mesoscopic electrode degradation","authors":"Gabriel Zarzoso , Eduardo Roque , Francisco Montero-Chacón , Javier Segurado","doi":"10.1016/j.mechmat.2024.105211","DOIUrl":"10.1016/j.mechmat.2024.105211","url":null,"abstract":"<div><div>An FFT based method is proposed to simulate chemo-mechanical problems at the microscale including fracture, specially suited to predict crack formation during the intercalation process in batteries. The method involves three fields fully coupled, concentration, deformation gradient and damage. The mechanical problem is set in a finite strain framework and solved using Fourier Galerkin for non-linear problems in finite strains. The damage is modeled with Phase Field Fracture using a stress driving force. This problem is solved in Fourier space using conjugate gradient with an ad-hoc preconditioner. The chemical problem is modeled with the second Fick’s law and physically based chemical potentials, is integrated using backward Euler and is solved by Newton–Raphson combined with a conjugate gradient solver. Buffer layers are introduced to break the periodicity and emulate Neumann boundary conditions for incoming mass flux. The framework is validated against Finite Elements the results of both methods are very close in all the cases. Finally, the framework is used to simulate the fracture of active particles of graphite during ion intercalation. The method is able to solve large problems at a reduced computational cost and reproduces the shape of the cracks observed in real particles.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105211"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Symmetry breaking and nonreciprocity in nonlinear phononic crystals: Inspiration from atomic interactions

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105231

Seyed Mohammad Hosein Abedy Nejad, Mir Masoud Seyyed Fakhrabadi

Symmetry breaking is an emerging trend in metamaterial research. To date, studies have primarily focused on breaking spatial or temporal symmetries through active interactions, leading to promising applications in waveguiding and manipulation. In this paper, we explore symmetry-breaking mechanisms by implementing the Morse-type potential function, resulting in asymmetric stiffness with different behaviors in tension and compression. We further answer whether this type of asymmetric stiffness leads to nonreciprocal behavior. Hence, our research focuses on wave propagation in nonlinear one- and two-dimensional phononic crystals using the Morse potential function. Our methodology then involves extracting dispersion curves using the semi-analytic method of multiple scales and numerical Spectro-spatial analysis. Our findings reveal interesting characteristics, including the formation of a bandgap at lower wave numbers (low-frequency waves), asymmetric wave propagation, and wave amplification. These results hold substantial potential for the design of advanced waveguides and wave filters.

{"title":"Symmetry breaking and nonreciprocity in nonlinear phononic crystals: Inspiration from atomic interactions","authors":"Seyed Mohammad Hosein Abedy Nejad, Mir Masoud Seyyed Fakhrabadi","doi":"10.1016/j.mechmat.2024.105231","DOIUrl":"10.1016/j.mechmat.2024.105231","url":null,"abstract":"<div><div>Symmetry breaking is an emerging trend in metamaterial research. To date, studies have primarily focused on breaking spatial or temporal symmetries through active interactions, leading to promising applications in waveguiding and manipulation. In this paper, we explore symmetry-breaking mechanisms by implementing the Morse-type potential function, resulting in asymmetric stiffness with different behaviors in tension and compression. We further answer whether this type of asymmetric stiffness leads to nonreciprocal behavior. Hence, our research focuses on wave propagation in nonlinear one- and two-dimensional phononic crystals using the Morse potential function. Our methodology then involves extracting dispersion curves using the semi-analytic method of multiple scales and numerical Spectro-spatial analysis. Our findings reveal interesting characteristics, including the formation of a bandgap at lower wave numbers (low-frequency waves), asymmetric wave propagation, and wave amplification. These results hold substantial potential for the design of advanced waveguides and wave filters.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105231"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling stress evolution during fiber oxidation

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105225

Isaac Duan, Victoria L. Christensen, Matthew R. Begley, Frank W. Zok

The paper examines stress evolution in oxidizing ceramic fibers, specifically focusing on silica scales growing on silicon carbide (SiC) fibers. Oxidation leads to the formation of oxide scales that induce significant stresses due to the molar volume expansion during oxidation. These stresses can lead to cracking of the oxide scale and reduction in fiber strength. To model these phenomena, an analytical framework is developed to describe stress evolution in cylindrical fibers. The elastic-creep behavior of the oxide is represented by a viscoelastic Maxwell model. By solving the governing ordinary differential equations (ODEs) and applying material properties relevant to the oxidation of SiC fibers, the study provides insights into the interplay between oxide growth, stress relaxation, and fiber geometry. The findings show that a single material parameter—encompassing fiber radius, oxidation rate, and oxide viscosity—dominates the stress evolution. The study also reveals approximate closed-form solutions for hoop and axial stresses, which match well with results from finite element analyses. These stresses are found to depend strongly on environmental conditions, with higher stress developing in steam compared to dry air. The results provide new insights into potential stress-induced fracture in oxidizing SiC fibers, with implications for high-temperature applications of ceramic materials.

{"title":"Modeling stress evolution during fiber oxidation","authors":"Isaac Duan, Victoria L. Christensen, Matthew R. Begley, Frank W. Zok","doi":"10.1016/j.mechmat.2024.105225","DOIUrl":"10.1016/j.mechmat.2024.105225","url":null,"abstract":"<div><div>The paper examines stress evolution in oxidizing ceramic fibers, specifically focusing on silica scales growing on silicon carbide (SiC) fibers. Oxidation leads to the formation of oxide scales that induce significant stresses due to the molar volume expansion during oxidation. These stresses can lead to cracking of the oxide scale and reduction in fiber strength. To model these phenomena, an analytical framework is developed to describe stress evolution in cylindrical fibers. The elastic-creep behavior of the oxide is represented by a viscoelastic Maxwell model. By solving the governing ordinary differential equations (ODEs) and applying material properties relevant to the oxidation of SiC fibers, the study provides insights into the interplay between oxide growth, stress relaxation, and fiber geometry. The findings show that a single material parameter—encompassing fiber radius, oxidation rate, and oxide viscosity—dominates the stress evolution. The study also reveals approximate closed-form solutions for hoop and axial stresses, which match well with results from finite element analyses. These stresses are found to depend strongly on environmental conditions, with higher stress developing in steam compared to dry air. The results provide new insights into potential stress-induced fracture in oxidizing SiC fibers, with implications for high-temperature applications of ceramic materials.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105225"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel elastoplastic impact contact model for thin orthotropic layer

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105214

Si-Yu Wu, Xu-Hao Huang

A complex stress state is often an obstacle in obtaining analytical solutions to elastoplastic contact problems of orthotropic structural materials. In this study, an analytical model is presented for investigating the impact contact between a rigid body and a thin orthotropic layer situated on a rigid foundation. By assuming that the local indentation during impact contact is due to the elastoplastic deformation, a theoretical study is carried out to predict the contact response of the orthotropic layer, which obeys an elastic-perfectly plastic stress-strain law. A relationship between contact force and indentation is derived, and the coefficient governing the rebound response is determined. The presented results show generally good agreement with the experimental and numerical results available in the literature. The impact contact model can also be utilized in the impact response analysis of coated structures. Parametric analysis results indicate that the elastic model tends to overestimate the impact resistance of thin layers. The elastoplastic contact law can accurately account for the decrease in contact force due to plastic indentation and permanent deformation. Moreover, the yield strength significantly influences the impact contact time and the permanent indentation deformation of the thin-layer structure.

{"title":"A novel elastoplastic impact contact model for thin orthotropic layer","authors":"Si-Yu Wu, Xu-Hao Huang","doi":"10.1016/j.mechmat.2024.105214","DOIUrl":"10.1016/j.mechmat.2024.105214","url":null,"abstract":"<div><div>A complex stress state is often an obstacle in obtaining analytical solutions to elastoplastic contact problems of orthotropic structural materials. In this study, an analytical model is presented for investigating the impact contact between a rigid body and a thin orthotropic layer situated on a rigid foundation. By assuming that the local indentation during impact contact is due to the elastoplastic deformation, a theoretical study is carried out to predict the contact response of the orthotropic layer, which obeys an elastic-perfectly plastic stress-strain law. A relationship between contact force and indentation is derived, and the coefficient governing the rebound response is determined. The presented results show generally good agreement with the experimental and numerical results available in the literature. The impact contact model can also be utilized in the impact response analysis of coated structures. Parametric analysis results indicate that the elastic model tends to overestimate the impact resistance of thin layers. The elastoplastic contact law can accurately account for the decrease in contact force due to plastic indentation and permanent deformation. Moreover, the yield strength significantly influences the impact contact time and the permanent indentation deformation of the thin-layer structure.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105214"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of heat treatment parameters and grain sizes on mechanical response of amorphous/crystalline CuZr composites

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105233

Menghan Yin , Mengye Duan , Tao Fu , Jie Wang , Shayuan Weng , Xiang Chen , Xianghe Peng

The amorphous phase proportion in nanocrystalline/amorphous CuZr samples was tailored using heat treatment processes under a fast-dynamic regime by varying temperature and time. It was revealed that using molecular dynamics simulations of tension tests, the samples with a larger fraction of crystalline phase exhibit superior mechanical properties. During tension, a dual-slope phenomenon was observed, driven by grain boundary behaviors and subsequent phase transition in the crystalline phase. The plastic deformation was mainly dominated by slip bands generated from dislocation nucleation in the crystalline phase, rather than embryonic shear bands in the amorphous phase. In contrast, the samples with a higher fraction of amorphous phase exhibit softening, leading to reduced mechanical properties. Plastic deformation in these samples is initiated by shear band nucleation in the amorphous phase, which expands within the amorphous phase and induces the formation of slip bands in the crystalline phase, though deformation remains predominantly governed by shear bands. These results can provide insight into the deformation behavior of nanoscale amorphous/crystalline dual-phase CuZr composites and guidance for the structural optimization of high-strength and high-plasticity amorphous/crystalline composites.

{"title":"Effects of heat treatment parameters and grain sizes on mechanical response of amorphous/crystalline CuZr composites","authors":"Menghan Yin , Mengye Duan , Tao Fu , Jie Wang , Shayuan Weng , Xiang Chen , Xianghe Peng","doi":"10.1016/j.mechmat.2024.105233","DOIUrl":"10.1016/j.mechmat.2024.105233","url":null,"abstract":"<div><div>The amorphous phase proportion in nanocrystalline/amorphous CuZr samples was tailored using heat treatment processes under a fast-dynamic regime by varying temperature and time. It was revealed that using molecular dynamics simulations of tension tests, the samples with a larger fraction of crystalline phase exhibit superior mechanical properties. During tension, a dual-slope phenomenon was observed, driven by grain boundary behaviors and subsequent phase transition in the crystalline phase. The plastic deformation was mainly dominated by slip bands generated from dislocation nucleation in the crystalline phase, rather than embryonic shear bands in the amorphous phase. In contrast, the samples with a higher fraction of amorphous phase exhibit softening, leading to reduced mechanical properties. Plastic deformation in these samples is initiated by shear band nucleation in the amorphous phase, which expands within the amorphous phase and induces the formation of slip bands in the crystalline phase, though deformation remains predominantly governed by shear bands. These results can provide insight into the deformation behavior of nanoscale amorphous/crystalline dual-phase CuZr composites and guidance for the structural optimization of high-strength and high-plasticity amorphous/crystalline composites.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105233"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing strength-ductility synergy of multilayer metals by periodic necking: Experiments and simulations

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105210

Jianfeng Zhao , Baoxi Liu , Wenxing Yu , Zengmeng Lin , Xiaochong Lu , Xu Zhang , Hui Chen

Multilayer metals are typical heterostructured materials where superior strength-ductility synergy is sought by combining materials with significant mismatches in mechanical properties. Strain delocalization has been identified as a pivotal mechanism for improving their ductility. However, the strategy for achieving this enhancement through manipulating the critical geometrical and mechanical factors pertaining to multilayer materials remains unclear. In this study, the uniaxial tensile behavior of multilayer TWIP/maraging steels is investigated through experiments, which unveil periodic necking-assisted plasticity regulated by the properties of constituent materials, rendering the multilayer steel both strong and ductile (Ultimate strength∼1.5 GPa, fracture straiñ15%). To explore optimized strategies for enhancing this advantage, detailed finite element simulations are performed on the tensile deformation of multilayer TWIP/maraging steels with varying geometrical and mechanical parameters. The formation of periodic necks observed in experiments is successfully reproduced by employing a ductile damage model for the constituent material and a cohesive zone model for the interface. Comprehensive simulation results revealed that within the parameter range studied in this work, the layer thickness ratio is the most relevant factor dominating the strength-ductility synergy, while the layer thickness, interface strength, interface thickness, and strain hardening ability of the TWIP steel mainly affect the ductility rather than strength. This research contributes to our understanding of ductility mediated by strain delocalization and provides valuable insights for the design of multilayer metals.

{"title":"Enhancing strength-ductility synergy of multilayer metals by periodic necking: Experiments and simulations","authors":"Jianfeng Zhao , Baoxi Liu , Wenxing Yu , Zengmeng Lin , Xiaochong Lu , Xu Zhang , Hui Chen","doi":"10.1016/j.mechmat.2024.105210","DOIUrl":"10.1016/j.mechmat.2024.105210","url":null,"abstract":"<div><div>Multilayer metals are typical heterostructured materials where superior strength-ductility synergy is sought by combining materials with significant mismatches in mechanical properties. Strain delocalization has been identified as a pivotal mechanism for improving their ductility. However, the strategy for achieving this enhancement through manipulating the critical geometrical and mechanical factors pertaining to multilayer materials remains unclear. In this study, the uniaxial tensile behavior of multilayer TWIP/maraging steels is investigated through experiments, which unveil periodic necking-assisted plasticity regulated by the properties of constituent materials, rendering the multilayer steel both strong and ductile (Ultimate strength∼1.5 GPa, fracture straiñ15%). To explore optimized strategies for enhancing this advantage, detailed finite element simulations are performed on the tensile deformation of multilayer TWIP/maraging steels with varying geometrical and mechanical parameters. The formation of periodic necks observed in experiments is successfully reproduced by employing a ductile damage model for the constituent material and a cohesive zone model for the interface. Comprehensive simulation results revealed that within the parameter range studied in this work, the layer thickness ratio is the most relevant factor dominating the strength-ductility synergy, while the layer thickness, interface strength, interface thickness, and strain hardening ability of the TWIP steel mainly affect the ductility rather than strength. This research contributes to our understanding of ductility mediated by strain delocalization and provides valuable insights for the design of multilayer metals.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105210"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A micromechanical model to predict the effective thermomechanical behavior of one-way shape memory polymers

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-02-01 DOI: 10.1016/j.mechmat.2024.105230

M. Bakhtiari, K. Narooei

Shape memory polymers (SMPs) are a class of intelligent materials capable of recovering their original shape in response to external stimuli. This study employs a modified Mori-Tanaka (MMT) model to predict the effective thermomechanical behavior of SMPs. By utilizing a homogenization procedure, a constitutive equation describing the evolution of the effective behavior of SMPs under thermomechanical loading was proposed. The model accounted for the SMP's dual-phase structure, consisting of active and frozen phases, and determined the effective stiffness by considering each phase's shape and volume fraction. Unlike existing phase transition models, the proposed model incorporates the interaction between phases and the phase transition process throughout the thermomechanical cycle. The model was implemented in the UMAT user subroutine of the ABAQUS software to simulate the mechanical behavior of SMPs. Investigations into various inclusion phase shapes revealed that an ellipsoidal shape most accurately represents the morphology of the inclusion phase. While shape recovery is influenced by inelastic strain, the stress response of the present model showed improved agreement with experimental results due to the consideration of phase interactions during transformation. Application of the proposed model to the auxetic behavior of a re-entrant structure fabricated from PLA demonstrated that varying Poisson's ratios and cell-opening factors (CoF) can be achieved by programming different deformation magnitudes. The most negative Poisson's ratio (−0.64) was obtained at a 70° re-entrant angle induced by a 20 mm pre-displacement. Additionally, the formulation was extended to simulate particle release, highlighting its potential application in drug delivery. The findings suggested that microstructure and non-uniform deformation significantly influence the cell-opening factor.

{"title":"A micromechanical model to predict the effective thermomechanical behavior of one-way shape memory polymers","authors":"M. Bakhtiari, K. Narooei","doi":"10.1016/j.mechmat.2024.105230","DOIUrl":"10.1016/j.mechmat.2024.105230","url":null,"abstract":"<div><div>Shape memory polymers (SMPs) are a class of intelligent materials capable of recovering their original shape in response to external stimuli. This study employs a modified Mori-Tanaka (MMT) model to predict the effective thermomechanical behavior of SMPs. By utilizing a homogenization procedure, a constitutive equation describing the evolution of the effective behavior of SMPs under thermomechanical loading was proposed. The model accounted for the SMP's dual-phase structure, consisting of active and frozen phases, and determined the effective stiffness by considering each phase's shape and volume fraction. Unlike existing phase transition models, the proposed model incorporates the interaction between phases and the phase transition process throughout the thermomechanical cycle. The model was implemented in the UMAT user subroutine of the ABAQUS software to simulate the mechanical behavior of SMPs. Investigations into various inclusion phase shapes revealed that an ellipsoidal shape most accurately represents the morphology of the inclusion phase. While shape recovery is influenced by inelastic strain, the stress response of the present model showed improved agreement with experimental results due to the consideration of phase interactions during transformation. Application of the proposed model to the auxetic behavior of a re-entrant structure fabricated from PLA demonstrated that varying Poisson's ratios and cell-opening factors (CoF) can be achieved by programming different deformation magnitudes. The most negative Poisson's ratio (−0.64) was obtained at a 70° re-entrant angle induced by a 20 mm pre-displacement. Additionally, the formulation was extended to simulate particle release, highlighting its potential application in drug delivery. The findings suggested that microstructure and non-uniform deformation significantly influence the cell-opening factor.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105230"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-mechanism damage-coupled constitutive model for ratchetting-fatigue interaction of extruded AZ31 magnesium alloy

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-01-31 DOI: 10.1016/j.mechmat.2025.105277

Yu Lei , Ziyi Wang , Chao Yu , Guozheng Kang

Magnesium (Mg) alloys have attracted much attention because of their advantage in lightweight design, and a theory of fatigue damage is a key issue for their engineering applications. Therefore, to capture the failure process of extruded AZ31 Mg alloy under complex stress states, a multi-mechanism damage-coupled constitutive model is constructed to reasonably describe the ratchetting-fatigue interaction of extruded AZ31 Mg alloy in the framework of continuum damage mechanics. Based on the multi-mechanism cyclic plastic constitutive model, the so-called pure fatigue damage caused by the plastic deformation resulted from different mechanisms (i.e., dislocation slipping and twinning/detwinning) is innovatively considered. Thus, two distinct evolution rules are formulated to account for two pure fatigue damage parts, respectively, and specifically addressing the coupling of such two damage parts. In addition, in view of significant ratchetting occurred in the extruded AZ31 Mg alloy under the loading conditions with high mean stresses and at elevated temperatures, additional damage caused by ratchetting (denoted as ratchetting damage) is also introduced into the evolution rule of total damage variable. Compared with the experimental results, the multi-mechanism damage-coupled constitutive model proposed in this paper can effectively predict the whole-life ratchetting and fatigue life of extruded AZ31 Mg alloy under different deformation mechanisms and at elevated temperatures.

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引用次数: 0

Evaluation of configurational/material forces in strain gradient elasticity theory

IF 3.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Mechanics of Materials

Pub Date : 2025-01-31 DOI: 10.1016/j.mechmat.2025.105240

Prince Henry Serrao, Sergey Kozinov

Configurational mechanics enables prediction of the inhomogeneities evolution, with the added advantage of the possibility of tracking their direction of growth. It is well-established for classical elasticity but is largely unexplored for strain gradient elasticity. Until now, efforts related to strain gradient elasticity have been primarily theoretical, requiring numerical investigations. The current research is a leap forward to encompass the complexity arising due to non-intuitive higher-order gradient terms in configurational mechanics. After verifying the stability of the mixed FE solution, the concept of manufactured solutions is utilized to highlight the trustworthiness of the newly developed post-processing configurational force script. This is followed by systematic investigations of different assumptions about the Eshelby stress tensor and its corresponding outcomes. Novel results, including the cause of shielding effect of strain gradient elasticity are discussed. Current research brings in important findings from higher-order configurational mechanics, further applicable in the fracture mechanics community.

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引用次数: 0

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