Mechanics of Materials最新文献

Bandgap characteristics of rib-stiffened plates with fluid–structure interaction: A finite element approach

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

Mechanics of Materials

Pub Date : 2025-02-03 DOI: 10.1016/j.mechmat.2025.105260

L.B. Hu , X. Zhou , R.Z. Zhang , Z.-Q. Xiao , Y. Cong , S.T. Gu

This work offers a comprehensive investigation into the vibration band gaps of periodically rib-stiffened plates, incorporating the effects of fluid–structure interaction (FSI). By coupling the Mindlin plate theory with Timoshenko beam theory, the proposed model enables flexible arrangements of ribs within the plate structure, enhancing its design versatility. The inertial effects of the surrounding fluid are rigorously accounted for through an augmented mass matrix, which includes Bloch periodic boundary conditions, providing a robust framework for capturing the FSI phenomena. Numerical validations confirm the accuracy of both the rib-stiffened plate model in the absence of fluid and the FSI-integrated model. A systematic exploration of vibration band gaps is conducted, emphasizing the influence of various rib configurations under fluid–structure interaction. Detailed parametric analysis of orthogonally rib-stiffened plates reveals that specific rib designs play a crucial role in tuning the band gaps, offering valuable insights for optimizing vibro-acoustic performance in engineering applications.

{"title":"Bandgap characteristics of rib-stiffened plates with fluid–structure interaction: A finite element approach","authors":"L.B. Hu , X. Zhou , R.Z. Zhang , Z.-Q. Xiao , Y. Cong , S.T. Gu","doi":"10.1016/j.mechmat.2025.105260","DOIUrl":"10.1016/j.mechmat.2025.105260","url":null,"abstract":"<div><div>This work offers a comprehensive investigation into the vibration band gaps of periodically rib-stiffened plates, incorporating the effects of fluid–structure interaction (FSI). By coupling the Mindlin plate theory with Timoshenko beam theory, the proposed model enables flexible arrangements of ribs within the plate structure, enhancing its design versatility. The inertial effects of the surrounding fluid are rigorously accounted for through an augmented mass matrix, which includes Bloch periodic boundary conditions, providing a robust framework for capturing the FSI phenomena. Numerical validations confirm the accuracy of both the rib-stiffened plate model in the absence of fluid and the FSI-integrated model. A systematic exploration of vibration band gaps is conducted, emphasizing the influence of various rib configurations under fluid–structure interaction. Detailed parametric analysis of orthogonally rib-stiffened plates reveals that specific rib designs play a crucial role in tuning the band gaps, offering valuable insights for optimizing vibro-acoustic performance in engineering applications.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105260"},"PeriodicalIF":3.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160603","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

Tailored energy dissipation with viscoelastic architectured materials

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.2024.105216

Aliae Welander , Isak Kinnunen , Anders Daneryd , Jan Hajek , Kiran Sahu , Mahmoud Mousavi

A family of architectured materials (AMs) is studied for viscous damping. A computational methodology is employed to capture the energetic behavior of the AM. While the presented approach is generic for any symmetry class of AMs, the selected Representative Volume Elements (RVEs) have cubic symmetry. In particular, the set of truss structures including simple cubic, body-centered cubic and face-centered cubic and the set of Triply Periodic Minimal Surfaces (TPMS) including Gyroid, Diamond and Schoen IWP are analyzed. First, a homogenization method is implemented to extract the effective viscoelastic behavior of the chosen AMs, verified based on the correspondence principle. Second, the energetic behavior including the storage and loss factors are extracted for different anisotropy directions of the lattices. And finally, in order to showcase the application of such tailored energy response under a class of loadings, the energy dissipation of the homogenized models of the different RVEs are elaborated under hydrostatic, tensile and shear modes. Interestingly, for the same base material and the same relative density, the different AMs show different energy dissipation behavior in hydrostatic, tensile and shear modes. This opens up an excellent library of materials for a tailored energy dissipation.

{"title":"Tailored energy dissipation with viscoelastic architectured materials","authors":"Aliae Welander , Isak Kinnunen , Anders Daneryd , Jan Hajek , Kiran Sahu , Mahmoud Mousavi","doi":"10.1016/j.mechmat.2024.105216","DOIUrl":"10.1016/j.mechmat.2024.105216","url":null,"abstract":"<div><div>A family of architectured materials (AMs) is studied for viscous damping. A computational methodology is employed to capture the energetic behavior of the AM. While the presented approach is generic for any symmetry class of AMs, the selected Representative Volume Elements (RVEs) have cubic symmetry. In particular, the set of truss structures including simple cubic, body-centered cubic and face-centered cubic and the set of Triply Periodic Minimal Surfaces (TPMS) including Gyroid, Diamond and Schoen IWP are analyzed. First, a homogenization method is implemented to extract the effective viscoelastic behavior of the chosen AMs, verified based on the correspondence principle. Second, the energetic behavior including the storage and loss factors are extracted for different anisotropy directions of the lattices. And finally, in order to showcase the application of such tailored energy response under a class of loadings, the energy dissipation of the homogenized models of the different RVEs are elaborated under hydrostatic, tensile and shear modes. Interestingly, for the same base material and the same relative density, the different AMs show different energy dissipation behavior in hydrostatic, tensile and shear modes. This opens up an excellent library of materials for a tailored energy dissipation.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105216"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the role of the matrix in the strength of carbon fiber-reinforced ceramics

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.2024.105227

Andrea Vigliotti , Ferdinando Auricchio , Damiano Pasini

Fiber-reinforced ceramic matrix composites (CMCs) are known for being able to preserve their mechanical properties at much higher temperatures than metal alloys. CMCs low mass density and superior mechanical strength, compared to plain monolithic ceramics, make them candidate materials for high-temperature applications when a significant load-bearing capacity is also required. In this paper, we use a phase field damage model combined with a multiscale approach to explore the mechanical strength of a unidirectional C-SiC composite under a range of uniaxial and biaxial stress conditions. In contrast to existing approaches that propose analytical solutions, restricted to specific load cases and given initial damage configurations, our approach is quite general and does not make any assumption on the type of damage. Starting from a damage free material, the resulting model is capable of reproducing the different failure mechanisms observed in the literature such as bridging of isolated matrix crack, delamination and fiber fragmentation. With this methodology, we can predict the strength and failure mechanics of composites under complex boundary conditions expressed in terms of the components of a macroscopic deformation field acting on the material. Interestingly, we find that under a wide range of cases we investigated, the composite damage consistently initiates in the matrix, far away from the interface with the fibers.

{"title":"On the role of the matrix in the strength of carbon fiber-reinforced ceramics","authors":"Andrea Vigliotti , Ferdinando Auricchio , Damiano Pasini","doi":"10.1016/j.mechmat.2024.105227","DOIUrl":"10.1016/j.mechmat.2024.105227","url":null,"abstract":"<div><div>Fiber-reinforced ceramic matrix composites (CMCs) are known for being able to preserve their mechanical properties at much higher temperatures than metal alloys. CMCs low mass density and superior mechanical strength, compared to plain monolithic ceramics, make them candidate materials for high-temperature applications when a significant load-bearing capacity is also required. In this paper, we use a phase field damage model combined with a multiscale approach to explore the mechanical strength of a unidirectional C-SiC composite under a range of uniaxial and biaxial stress conditions. In contrast to existing approaches that propose analytical solutions, restricted to specific load cases and given initial damage configurations, our approach is quite general and does not make any assumption on the type of damage. Starting from a damage free material, the resulting model is capable of reproducing the different failure mechanisms observed in the literature such as bridging of isolated matrix crack, delamination and fiber fragmentation. With this methodology, we can predict the strength and failure mechanics of composites under complex boundary conditions expressed in terms of the components of a macroscopic deformation field acting on the material. Interestingly, we find that under a wide range of cases we investigated, the composite damage consistently initiates in the matrix, far away from the interface with the fibers.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105227"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151477","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 investigation into instantaneously tuning the EMI shielding characteristics of CNT-based nanocomposite biofoams in the X-band range by strain loading

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.2024.105209

Xiaodong Xia , Yang Liu , Shilin Huang , Jianyang Luo , George J. Weng

The electromagnetic interference (EMI) shielding of CNT-based nanocomposite biofoams is capable of being tailored instantaneously by mechanical loading. In contrast to tuning the EMI shielding via nanofillers or by decoration process, the strain-activated EMI tailoring characteristics possess enormous potential that still await to be explored. To reveal this tailoring mechanism, a multi-scale electro-magneto-mechanically coupled homogenization model is developed to tailor the EMI characteristics of CNT-based nanocomposite biofoams in the X-band range (8.2–12.4 GHz). In this development, the elastic moduli, complex conductivity, and complex permeability are all selected as the homogenization variables. Four categories of interface effects are considered, including imperfect interface bonding, electron tunneling, Maxwell-Wagner-Sillars polarization, and electron hopping. The predicted EMI tailoring characteristics are validated by the experiment of CNT/wheat flour nanocomposite biofoam over a wide range of stain loading. The effective EMI shielding behavior decreases with the compressive loading, but it increases with the tensile loading. It is found that a CNT content higher than the percolation threshold is necessary to tailor the EMI shielding behavior of this nanocomposite foam via strain loading. This study can provide innovative insights to tune the EMI shielding characteristics of CNT-based nanocomposite biofoams in X-band instantaneously.

{"title":"An investigation into instantaneously tuning the EMI shielding characteristics of CNT-based nanocomposite biofoams in the X-band range by strain loading","authors":"Xiaodong Xia , Yang Liu , Shilin Huang , Jianyang Luo , George J. Weng","doi":"10.1016/j.mechmat.2024.105209","DOIUrl":"10.1016/j.mechmat.2024.105209","url":null,"abstract":"<div><div>The electromagnetic interference (EMI) shielding of CNT-based nanocomposite biofoams is capable of being tailored instantaneously by mechanical loading. In contrast to tuning the EMI shielding via nanofillers or by decoration process, the strain-activated EMI tailoring characteristics possess enormous potential that still await to be explored. To reveal this tailoring mechanism, a multi-scale electro-magneto-mechanically coupled homogenization model is developed to tailor the EMI characteristics of CNT-based nanocomposite biofoams in the X-band range (8.2–12.4 GHz). In this development, the elastic moduli, complex conductivity, and complex permeability are all selected as the homogenization variables. Four categories of interface effects are considered, including imperfect interface bonding, electron tunneling, Maxwell-Wagner-Sillars polarization, and electron hopping. The predicted EMI tailoring characteristics are validated by the experiment of CNT/wheat flour nanocomposite biofoam over a wide range of stain loading. The effective EMI shielding behavior decreases with the compressive loading, but it increases with the tensile loading. It is found that a CNT content higher than the percolation threshold is necessary to tailor the EMI shielding behavior of this nanocomposite foam via strain loading. This study can provide innovative insights to tune the EMI shielding characteristics of CNT-based nanocomposite biofoams in X-band instantaneously.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105209"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Equivalent Inclusion Method (EIM) for isotropic and anisotropic spatially oriented spheroidal inhomogeneities: A unified calculation module validated via comparisons to Finite Element (FE) 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.2024.105194

Rémy Serre , Carole Nadot-Martin , Philippe Bocher

This paper is centered on the Equivalent Inclusion Method due to Eshelby (1957, 1959, 1961) to solve inhomogeneous ellipsoidal inclusion problems. The objective is to develop a unified EIM program for spatially oriented isotropic and anisotropic spheroids and validate each stage of the developments in a controlled and rigorous way. At first, the analytical calculations of spatial derivatives of the elliptic integrals, involved in the expression of the strain field in the isotropic infinite medium, are pushed as far as possible for an Oblate spheroid and coded as it was done by Vincent et al., 2014 for the Prolate shape. Then, spatial orientation of the spheroid with respect to the global axis system attached to the infinite medium is introduced. Anisotropic metal inhomogeneities are finally dealt with, with the possibility to assign different crystallographic orientations. In this final configuration involving both the spatial orientation and anisotropy, three axis systems have to be managed simultaneously. Such a complexity legitimates a progressive evaluation towards this case. Thus, each new functionality introduced in the code is carefully validated by comparisons of the results to Finite Element reference solutions both inside and outside the inhomogeneity along different paths from the interface. This is done for an isotropic inhomogeneity without and with spatial orientation at first, and for an anisotropic inhomogeneity in the same way. These evaluations are presented for different shapes, aspect ratios, property contrasts. Such a complete evaluation involving at each stage various cases and examining the fields inside and outside the inhomogeneity constitutes an original contribution of the present work and allows to be confident in the proposed code (available on request). Another contribution of the paper is to analyze the influence of various factors (shape, aspect ratio, spatial orientation) on the fields distribution when both the anisotropy and the spatial orientation of the spheroidal inhomogeneity are combined. This last part illustrates also the efficiency of the EIM to deal with such an analysis with both accuracy and a low calculation cost.

{"title":"Equivalent Inclusion Method (EIM) for isotropic and anisotropic spatially oriented spheroidal inhomogeneities: A unified calculation module validated via comparisons to Finite Element (FE) simulations","authors":"Rémy Serre , Carole Nadot-Martin , Philippe Bocher","doi":"10.1016/j.mechmat.2024.105194","DOIUrl":"10.1016/j.mechmat.2024.105194","url":null,"abstract":"<div><div>This paper is centered on the Equivalent Inclusion Method due to Eshelby (1957, 1959, 1961) to solve inhomogeneous ellipsoidal inclusion problems. The objective is to develop a unified EIM program for spatially oriented isotropic and anisotropic spheroids and validate each stage of the developments in a controlled and rigorous way. At first, the analytical calculations of spatial derivatives of the elliptic integrals, involved in the expression of the strain field in the isotropic infinite medium, are pushed as far as possible for an Oblate spheroid and coded as it was done by Vincent et al., 2014 for the Prolate shape. Then, spatial orientation of the spheroid with respect to the global axis system attached to the infinite medium is introduced. Anisotropic metal inhomogeneities are finally dealt with, with the possibility to assign different crystallographic orientations. In this final configuration involving both the spatial orientation and anisotropy, three axis systems have to be managed simultaneously. Such a complexity legitimates a progressive evaluation towards this case. Thus, each new functionality introduced in the code is carefully validated by comparisons of the results to Finite Element reference solutions both inside and outside the inhomogeneity along different paths from the interface. This is done for an isotropic inhomogeneity without and with spatial orientation at first, and for an anisotropic inhomogeneity in the same way. These evaluations are presented for different shapes, aspect ratios, property contrasts. Such a complete evaluation involving at each stage various cases and examining the fields inside and outside the inhomogeneity constitutes an original contribution of the present work and allows to be confident in the proposed code (available on request). Another contribution of the paper is to analyze the influence of various factors (shape, aspect ratio, spatial orientation) on the fields distribution when both the anisotropy and the spatial orientation of the spheroidal inhomogeneity are combined. This last part illustrates also the efficiency of the EIM to deal with such an analysis with both accuracy and a low calculation cost.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105194"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150916","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

Efficient prediction of strength and strain localisation in porous solids via microstructure-based limit analysis

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.2024.105208

Jonas Hund , Varvara Kouznetsova , Tito Andriollo

A new method is presented to predict strength and strain localisation in solids containing voids or soft particles at reduced computational cost compared to traditional micro-mechanical approaches. The method leverages the fact that strain localisation in such materials occurs in the form of narrow shear bands connecting the voids. Accordingly, the model domain is discretised with rigid triangular blocks defined by the Delaunay triangulation of the void centroids. Deformation and energy dissipation are assumed to be confined to discontinuities of the velocity field introduced along the block edges, representing the narrow zones of strain localisation within the shear bands. The block velocities are computed within the framework of plastic limit analysis by minimising the total rate of internal work while ensuring compatible deformation across the solid. Accordingly, the predicted strength represents an upper bound. The adopted microstructure-based discretisation strategy effectively limits the number of potential discontinuities compared to similar methods proposed in the literature, thereby increasing the computational efficiency. To demonstrate the capabilities of the method, predicted macroscopic strength under uniaxial tension and strain localisation patterns in 2D porous microstructures with varying porosity fractions are compared to the finite element results.

{"title":"Efficient prediction of strength and strain localisation in porous solids via microstructure-based limit analysis","authors":"Jonas Hund , Varvara Kouznetsova , Tito Andriollo","doi":"10.1016/j.mechmat.2024.105208","DOIUrl":"10.1016/j.mechmat.2024.105208","url":null,"abstract":"<div><div>A new method is presented to predict strength and strain localisation in solids containing voids or soft particles at reduced computational cost compared to traditional micro-mechanical approaches. The method leverages the fact that strain localisation in such materials occurs in the form of narrow shear bands connecting the voids. Accordingly, the model domain is discretised with rigid triangular blocks defined by the Delaunay triangulation of the void centroids. Deformation and energy dissipation are assumed to be confined to discontinuities of the velocity field introduced along the block edges, representing the narrow zones of strain localisation within the shear bands. The block velocities are computed within the framework of plastic limit analysis by minimising the total rate of internal work while ensuring compatible deformation across the solid. Accordingly, the predicted strength represents an upper bound. The adopted microstructure-based discretisation strategy effectively limits the number of potential discontinuities compared to similar methods proposed in the literature, thereby increasing the computational efficiency. To demonstrate the capabilities of the method, predicted macroscopic strength under uniaxial tension and strain localisation patterns in 2D porous microstructures with varying porosity fractions are compared to the finite element results.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105208"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The role of crystal orientation in cracking performance of HCP magnesium single crystals

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.2024.105235

Xin Lai , Siyan Ran , Xiaoyang Pei , Hao Zhang , Fang Wang

This work was committed to conducting atomistic simulations for exploring the crystal orientation dependence of fracture behavior in hexagonal close-packed (HCP) magnesium single crystals. Combined with the traction–separation (T–S) law of the cohesive zone model, microstructure evolutions with various orientations during crack propagation were investigated to probe the anisotropy of crack pattern. We discovered that stress concentrations at the crack tip led to dislocation emission, which was strongly dependent upon the Schmid factor. It was also found that for the (1_210) [10_10] crack orientation, the stress-induced phase transition occurring at the crack tip delayed the crack extension, indicative of the coupling between phase transition and crack propagation. Interestingly, there were several deformation twin types produced at various orientations, which duly affected the crack pattern. Especially for the (0001) [1_210] crack orientation, the formation and growth of {11_21} twins promoted the brittle-to-ductile cracking, which was different from other two orientations. Furthermore, the resultant T–S parameters together with microstructural evolution information revealed the contribution of crystal orientation to intrinsic fracture behavior. This study is expected to offer in-depth insights on the crack-tip behavior induced by crystal orientation, promoting the development of magnesium.

{"title":"The role of crystal orientation in cracking performance of HCP magnesium single crystals","authors":"Xin Lai , Siyan Ran , Xiaoyang Pei , Hao Zhang , Fang Wang","doi":"10.1016/j.mechmat.2024.105235","DOIUrl":"10.1016/j.mechmat.2024.105235","url":null,"abstract":"<div><div>This work was committed to conducting atomistic simulations for exploring the crystal orientation dependence of fracture behavior in hexagonal close-packed (HCP) magnesium single crystals. Combined with the traction–separation (T–S) law of the cohesive zone model, microstructure evolutions with various orientations during crack propagation were investigated to probe the anisotropy of crack pattern. We discovered that stress concentrations at the crack tip led to dislocation emission, which was strongly dependent upon the Schmid factor. It was also found that for the (1_210) [10_10] crack orientation, the stress-induced phase transition occurring at the crack tip delayed the crack extension, indicative of the coupling between phase transition and crack propagation. Interestingly, there were several deformation twin types produced at various orientations, which duly affected the crack pattern. Especially for the (0001) [1_210] crack orientation, the formation and growth of {11_21} twins promoted the brittle-to-ductile cracking, which was different from other two orientations. Furthermore, the resultant T–S parameters together with microstructural evolution information revealed the contribution of crystal orientation to intrinsic fracture behavior. This study is expected to offer in-depth insights on the crack-tip behavior induced by crystal orientation, promoting the development of magnesium.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105235"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150881","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

Mechanical effects of self-stress states in graphene membranes in multiscale modeling

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.2024.105226

Michele Curatolo , Ginevra Salerno

Graphene, an atomically thin material renowned for its exceptional properties, plays a pivotal role in several technological applications. This work elucidates critical aspects of graphene research, particularly focusing on the effects of its transfer onto suitable substrates. Indeed, from the mechanical point of view the transfer process induces self-stresses within the graphene layer. In addition, formidable applications in the field of biosensors, filtration membranes, and special electronic devices are based on precision perforated-graphene. However, perforation introduces localized stress concentrations, altering mechanical behavior and the strength of the graphene membrane.

In this paper, the effects of self-stress states on graphene membrane strength are studied through numerical models. Specifically, the mechanical strength of pristine and perforated graphene membranes subjected to different self-stress states is studied at the nanoscale, using a static molecular mechanics model. Then, a suitably calibrated hyper-elastic continuum model is formulated and correlated with the molecular mechanics model to study the mechanical strength at the micron scale, which is the actual scale of the membranes. Results give important insights on the effects of self-stress states in graphene membranes. We found out also that the interaction distance between holes is strongly influenced by the self-stress state.

{"title":"Mechanical effects of self-stress states in graphene membranes in multiscale modeling","authors":"Michele Curatolo , Ginevra Salerno","doi":"10.1016/j.mechmat.2024.105226","DOIUrl":"10.1016/j.mechmat.2024.105226","url":null,"abstract":"<div><div>Graphene, an atomically thin material renowned for its exceptional properties, plays a pivotal role in several technological applications. This work elucidates critical aspects of graphene research, particularly focusing on the effects of its transfer onto suitable substrates. Indeed, from the mechanical point of view the transfer process induces self-stresses within the graphene layer. In addition, formidable applications in the field of biosensors, filtration membranes, and special electronic devices are based on precision perforated-graphene. However, perforation introduces localized stress concentrations, altering mechanical behavior and the strength of the graphene membrane.</div><div>In this paper, the effects of self-stress states on graphene membrane strength are studied through numerical models. Specifically, the mechanical strength of pristine and perforated graphene membranes subjected to different self-stress states is studied at the nanoscale, using a static molecular mechanics model. Then, a suitably calibrated hyper-elastic continuum model is formulated and correlated with the molecular mechanics model to study the mechanical strength at the micron scale, which is the actual scale of the membranes. Results give important insights on the effects of self-stress states in graphene membranes. We found out also that the interaction distance between holes is strongly influenced by the self-stress state.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"201 ","pages":"Article 105226"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150923","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

Criteria for mode shape tracking in Micropolar-Cosserat periodic panels

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.2024.105213

S.K. Singh , A. Banerjee , A.A. Baxy , R.K. Varma

This study communicates the dispersion nature and motion of propagating waves on the periodic panels resulting from the variation of the Micropolar-Cosserat (MC) parameters such as characteristic length-scale and Cosserat shear modulus. The non-dimensionalization of the system determines the independent parameters for the MC beam model in order to examine the motion of the micro-rotational as well as flexural wave modes. A periodic boundary condition based on Bloch-Floquet’s theorem is employed on the unit cell to maintain the periodicity and assess the eigenvalue domain within the transfer matrix approach. A significant part of this enlightening theoretical comprehension regarding veering, locking, and coupling is elucidated by tracking the mode shapes within the Modal Assurance Criteria (MAC), which is the prime novelty of this research. Periodically pass-band and partial bandwidth are also examined to build up confidence concerning the complex and real wave modes, respectively. A slight variation of MC parameters can dramatically alter the emergence of veering, locking, and coupling phenomena, even 1% only. The band gap (BG) calculated through the two-dimensional (2-D) Finite Element Analysis (FEM) corroborates well with the reduced one-dimensional (1-D) MC periodic panels.

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引用次数: 0

Machine learning-boosted nonlinear homogenization

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.2024.105229

Mikhael Tannous , Chady Ghnatios , Olivier Castelnau , Pedro Ponte Castañeda , Francisco Chinesta

Previous research has established nonlinear homogenization as an efficient technique for deriving macroscopic constitutive relations and field statistics in heterogeneous (i.e. composite) materials. This method involves optimal linearization of the nonlinear composite, resulting in a best linear comparison composite that shares identical microstructure and field statistics with the nonlinear material. However, the computational time associated with this method increases as the fidelity of the material representation improves, limiting its practical implementation in commercial finite element software for large-scale structural calculations in which a Representative Volume Element must be considered at each integration point. To overcome this limitation without sacrificing precision or efficiency, machine learning can be employed to develop a digital twin of the homogenization-based constitutive law. This approach enables real-time prediction of macroscopic material behavior while maintaining accuracy. The effectiveness of this approach has been demonstrated for two-phase composites with nonlinear power-law constitutive relations, and it has been successfully extended to model the complex three-dimensional behavior of viscoplastic polycrystals. In the latter case, a significant reduction in computational time has been achieved without compromising the precision of nonlinear homogenization method outputs.

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引用次数: 0