Mechanics of Materials最新文献_第2页

Effects of grain structure inhomogeneity on dynamic deformation mechanisms and spallation of medium entropy alloy CoCrNi under ramp wave loading 斜波加载下晶粒组织不均匀性对中熵合金CoCrNi动态变形机制和裂裂的影响

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-24 DOI: 10.1016/j.mechmat.2025.105416

Liyi Zhu, Xiaoqing Zhang, Kai Wang, Shuang Qin, Zhuocheng Xie, Xiaohu Yao

{"title":"Effects of grain structure inhomogeneity on dynamic deformation mechanisms and spallation of medium entropy alloy CoCrNi under ramp wave loading","authors":"Liyi Zhu, Xiaoqing Zhang, Kai Wang, Shuang Qin, Zhuocheng Xie, Xiaohu Yao","doi":"10.1016/j.mechmat.2025.105416","DOIUrl":"10.1016/j.mechmat.2025.105416","url":null,"abstract":"<div><div>By leveraging large-scale molecular dynamics simulations, the effects of grain structure inhomogeneity on the ramp wave response and spall failure behavior of CoCrNi medium entropy alloy are thoroughly investigated, with loading velocities varying between 800 m/s and 1400 m/s. In the uniform nanocrystalline (UNC) models with homogeneous grain size distribution, the Hugoniot elastic limit (HEL) initially increases as the grain size grows from 3 nm to 9 nm but decreases as the grain size further increases to 12 nm. This behavior suggests a transition in the dominant deformation mechanism from intergranular grain boundary (GB) deformation to intragranular activities. For comparison, gradient nanocrystalline (GNC) models, featuring a linear grain size variation along the loading direction from 3 nm to 12 nm, and the heterogeneous nanocrystalline (HNC) models, exhibiting an abrupt grain size change from 3 nm to 12 nm, are also examined. Both GNC and HNC models exhibit a combination of intragranular defect multiplications (involving dislocation slip, stacking fault (SF), and twin boundary (TB) expansion) and intergranular GB movement during the plastic deformation, resulting in shear strain homogenization, especially at the GBs. Consequently, the pronounced strain delocalization caused by grain structure inhomogeneity promotes cooperative deformation between GBs and grain interiors, effectively hindering void nucleation and expansion. This leads to enhanced spall strength in both the GNC and HNC models. This study provides a strategy of grain structure engineering for designing polycrystalline MEA under dynamic loading conditions.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105416"},"PeriodicalIF":3.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502581","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 gradient plasticity model for porous metals with random spheroidal voids: Theory and applications 具有随机球体孔洞的多孔金属的梯度塑性模型：理论与应用

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-24 DOI: 10.1016/j.mechmat.2025.105413

S. Xenos , K. Danas , N. Aravas

{"title":"A gradient plasticity model for porous metals with random spheroidal voids: Theory and applications","authors":"S. Xenos , K. Danas , N. Aravas","doi":"10.1016/j.mechmat.2025.105413","DOIUrl":"10.1016/j.mechmat.2025.105413","url":null,"abstract":"<div><div>This work deals with the development of a rate-independent, implicit gradient plasticity model for porous metallic materials comprising microstructures with an isotropic distribution of randomly oriented spheroidal voids. We take into account void shape effects via a single constant, the void aspect ratio, which can be used as a calibration parameter for the model. The non-local formulation introduces a characteristic material length, which serves as a regularization parameter and can be estimated by association to a microstructural dimension of the material at hand. The mathematical character of the resulting non-local problem and the conditions for loss of ellipticity are carefully examined. We show, both analytically and numerically, that the proposed model retains the elliptic properties of the governing equations and can provide mesh-independent numerical solutions in the post-bifurcation (softening) regime. This analysis also indicates that the critical localization strain is an increasing function of the void shape. Implementation of the model in the finite element software ABAQUS allows to investigate the effects of the various parameters through the numerical simulation of industrially relevant problems such as the cup-and-cone fracture of cylindrical bars and the Charpy V-notch test. By revisiting the first Sandia Fracture Challenge, we showcase the capability of the model to sufficiently reproduce real-world experimental results while maintaining a manageable number of calibrated parameters.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105413"},"PeriodicalIF":3.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502582","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

Design and optimization of high-performance 3D Euplectella aspergillum-like truss lattices insensitive to brittle material properties 对脆性材料性能不敏感的高性能三维曲霉样欧普莱克菌桁架结构的设计与优化

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-24 DOI: 10.1016/j.mechmat.2025.105420

Yuna Sang , Yichen Zhou , Yushun Zhao , Chao Sui , Jingxuan Zhang , Chao Wang

{"title":"Design and optimization of high-performance 3D Euplectella aspergillum-like truss lattices insensitive to brittle material properties","authors":"Yuna Sang , Yichen Zhou , Yushun Zhao , Chao Sui , Jingxuan Zhang , Chao Wang","doi":"10.1016/j.mechmat.2025.105420","DOIUrl":"10.1016/j.mechmat.2025.105420","url":null,"abstract":"<div><div>Lattice structures have emerged as a class of lightweight metamaterials with exceptional properties, however, low structural efficiency creates a dilemma to achieve simultaneously lightweight and strong. Here, we innovatively propose a novel truss lattice inspired by glass sponge. The optimal topology of ceramic lattice is proven to be insensitive to material parameters, via theoretical predictions and multi-objective optimization. Following the designed topology, ceramic lattices are fabricated via a digital light processing (DLP) system and uniaxial compression tests prove that lattice concurrently possesses high specific strength and superior energy absorption at low weight, surpassing the majority of macroscopic ceramic lattices. These excellent performance stems from the optimized topological design, which enhances buckling resistance. The ingenious design leads to reasonable compromise and provides a balance between mechanical properties. Our study demonstrates a feasible route to design geometries with programmable properties.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105420"},"PeriodicalIF":3.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517712","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

Coupled effects of dispersions in interface sliding stress and fiber strength on tensile response of ceramic composites 界面滑动应力和纤维强度分散对陶瓷复合材料拉伸响应的耦合影响

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-21 DOI: 10.1016/j.mechmat.2025.105421

Madeleine McAllister, E. Benjamin Callaway, Frank W. Zok

{"title":"Coupled effects of dispersions in interface sliding stress and fiber strength on tensile response of ceramic composites","authors":"Madeleine McAllister, E. Benjamin Callaway, Frank W. Zok","doi":"10.1016/j.mechmat.2025.105421","DOIUrl":"10.1016/j.mechmat.2025.105421","url":null,"abstract":"<div><div>Micromechanics models for fiber-reinforced ceramic composites consider fiber strength as stochastic but assume other material properties are deterministic. However, experimental data show considerable variability in interface sliding stress within single composite specimens. This study advances the models by integrating sliding stress dispersions with stochastic fiber strength. We use analytical models and Monte Carlo simulations to investigate the combined effects of these dispersions in two scenarios: (i) a composite containing a single matrix crack bridged by fibers, where the matrix is rigid and cannot crack away from the main crack, and (ii) a composite with a single fragmenting fiber in a matrix that is heavily-cracked, unable to bear axial load but rigid in shear. Results show that dispersion effects in the first case lead to greater strength reductions than in the second. Dispersion effects are attributed to differences in characteristic fiber strengths, uniformity of fiber loading, and fractional lengths of slipped fibers. Analytical formulations describing the combined dispersion effects are also developed and evaluated. Finally, examination of the results reveals a deficiency in the single fiber composite model, highlighting a flaw due to the absence of kinematic constraints on fiber extension across matrix cracks.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105421"},"PeriodicalIF":3.4,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480610","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

Two competitive ignition mechanism for dynamic extrusion-shear loaded high-energy propellant 动态挤压-剪切加载高能推进剂的两种竞争点火机制

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-20 DOI: 10.1016/j.mechmat.2025.105419

Liying Dong, Yanqing Wu, Kun Yang, Junwu Zhu, Xingzhong Wu

{"title":"Two competitive ignition mechanism for dynamic extrusion-shear loaded high-energy propellant","authors":"Liying Dong, Yanqing Wu, Kun Yang, Junwu Zhu, Xingzhong Wu","doi":"10.1016/j.mechmat.2025.105419","DOIUrl":"10.1016/j.mechmat.2025.105419","url":null,"abstract":"<div><div>Tactical missiles frequently experience accidental drops, impacts, and other events during maintenance and battlefield operations, subjecting their internal high-energy propellants to complex loads like extrusion-shear, which can trigger ignition and pose safety hazards. This study aims to elucidate the ignition mechanism of high-energy propellants under extrusion-shear and establish a predictive method. Firstly, a visualized extrusion-shear experiment was designed to directly observe the whole process of deformation, damage and ignition of GRT propellant. By adjusting the gap size, the correlation between overall flow deformation and local ignition mechanisms was explored. Secondly, a thermo-mechanical coupling model and a macro-micro perspective ignition criterion were integrated into the LS-DYNA subroutine to simulate local ignition responses under extrusion-shear loading and compare them with other ignition criteria. The results show that the fracture surface extending from the gap divides the sample into flow and stagnant regions, forming a slip surface at the boundary. As the gap size decreases from <em>Φ</em>3 × 23 mm to <em>Φ</em>1 × 1 mm, the ignition mechanism transitions from viscous external friction to viscous internal friction, altering the viscous frictional heating rate and resulting in distinct threshold velocities. The macro-micro-scale ignition criterion based on the viscous internal friction mechanism effectively describes the ignition behavior of GRT propellant under narrow gaps, and compared to other ignition criteria, provides the closest match with experimental results, demonstrating excellent universality.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105419"},"PeriodicalIF":3.4,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144469915","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

Material extrusion additive manufacturing of Acrylonitrile-Butadiene-Styrene: Experiments and anisotropic model for the orientation angle 丙烯腈-丁二烯-苯乙烯材料挤压增材制造：实验及取向角的各向异性模型

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-14 DOI: 10.1016/j.mechmat.2025.105408

Wilco M.H. Verbeeten, Miriam Lorenzo-Bañuelos

{"title":"Material extrusion additive manufacturing of Acrylonitrile-Butadiene-Styrene: Experiments and anisotropic model for the orientation angle","authors":"Wilco M.H. Verbeeten, Miriam Lorenzo-Bañuelos","doi":"10.1016/j.mechmat.2025.105408","DOIUrl":"10.1016/j.mechmat.2025.105408","url":null,"abstract":"<div><div>The yield stress as a function of both strain rate and orientation angle was measured for material extrusion additively manufactured (ME-AM) Acrylonitrile-Butadiene-Styrene (ABS). Unidirectional test specimens were extracted by waterjet-cutting at different orientation angles from ME-AM processed plates. By printing rectangular plates, a strand trajectory of constant length can be applied. Thus, the thermo-mechanical history of the material was as similar as possible across the plate. By determining an average sample porosity using Archimedes’ principle, yield stress values could be compensated for the voids present in ME-AM specimen. A time- and orientation-dependent model, which combines an Eyring flow rule with Hill anisotropy, was used to describe the yield stresses as a function of strain rate and orientation angle. The model uses a factorizable approach, <em>i.e.</em> both effects are decoupled, which simplifies the determination of model parameters. This anisotropic continuum-based viscoelastic Eyring-Hill model is able to adequately predict the complex experimental yield stress behavior, which is a challenging task. Scanning Electron Microscope fractography revealed macroscopically more ductile behavior due to failure in the strand direction. Macroscopically brittle behavior was related to inter-strand failure. The present study is an important step towards the prediction of structural integrity of ME-AM parts, as time- and orientation-dependency are also important in creep and fatigue behavior.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105408"},"PeriodicalIF":3.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313196","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 physically-based thermo-viscoelastic constitutive model of phantom and entangled networks in amorphous shape memory polymers 基于物理的非晶态形状记忆聚合物的幻影和纠缠网络的热粘弹性本构模型

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-12 DOI: 10.1016/j.mechmat.2025.105417

Jianwei Deng , Haibao Lu , Yong Qing Fu

{"title":"A physically-based thermo-viscoelastic constitutive model of phantom and entangled networks in amorphous shape memory polymers","authors":"Jianwei Deng , Haibao Lu , Yong Qing Fu","doi":"10.1016/j.mechmat.2025.105417","DOIUrl":"10.1016/j.mechmat.2025.105417","url":null,"abstract":"<div><div>Amorphous shape memory polymers (SMPs) are one of the most prominent smart and intelligent materials, whose constitutive models play important roles for their engineering designs and applications. Over the past decades, various thermo-viscoelastic constitutive models have been developed to simulate their shape memory behaviors, but these models are mostly phenomenological and often unable to explain the underlying mechanisms of their viscoelasticity and shape memory effects. Herein we propose a physically-based thermo-viscoelastic constitutive model to describe SMPs’ shape memory behaviors. We propose that the SMPs are composed of both hard and soft phase chains. The hard phase chains form a backbone network showing strong elastic responses, which can be modeled with a phantom network model. Whereas the soft phase chains form transient networks and entangled networks exhibiting viscoelastic behaviors, which can be explained using contour length relaxation and disentanglement relaxation phenomena. Time-temperature superposition principle is then incorporated to capture critical time-temperature dependence of the viscoelasticity and thermally induced shape memory effect. The proposed model has been implemented numerically and validated using shape memory experimental results at different recovery temperatures and heating rates, during the shape memory processes of amorphous SMPs. This work presents a good understanding of the viscoelasticity and shape memory effects of amorphous SMPs at the polymer chain level, and also provides an effective constitutive model for practical applications.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105417"},"PeriodicalIF":3.4,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291418","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 of glass-fiber-reinforced 3D-printed filaments using micro-computed tomography data 利用微计算机断层扫描数据对玻璃纤维增强3d打印长丝进行建模

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-11 DOI: 10.1016/j.mechmat.2025.105396

E. Polyzos, Y. Zhu, L. Pyl

引用次数: 0

STAMS 2023 / SEMTA-MECAMAT COLLOQUIUM Mechanics Across the Scales 《跨越尺度的力学》研讨会

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-11 DOI: 10.1016/j.mechmat.2025.105414

M.P. Ariza , C. Czarnota , L. Stainier , J.A. Rodríguez-Martínez

引用次数: 0

Multi-field induced reconfigurable point defect state of flexural waves in magnetostrictive phononic crystals plates 磁致伸缩声子晶体板中弯曲波的多场诱导可重构点缺陷态

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-06-10 DOI: 10.1016/j.mechmat.2025.105415

Shunzu Zhang, Lichao Su

{"title":"Multi-field induced reconfigurable point defect state of flexural waves in magnetostrictive phononic crystals plates","authors":"Shunzu Zhang, Lichao Su","doi":"10.1016/j.mechmat.2025.105415","DOIUrl":"10.1016/j.mechmat.2025.105415","url":null,"abstract":"<div><div>Point defect state of phononic crystals (PCs) has attracted increasing interest owing to the unique characteristics of wave localization. However, the effectively and dynamically multi-field realization of point defect state of elastic waves in complex environments is still a challenge. We propose a magnetostrictive PC plate aiming to dynamically achieve the reconfigurable point defect state of flexural waves by adjusting magnetic, mechanical and thermal loadings. The controllable band gap can be successfully induced by changing the multi-field loadings. Subsequently, we design three Schemes to induce the reconfigurable point defect without altering the structure, i.e., magnetic-induced, thermal-induced and multi-field (magnetic and thermal) induced Schemes, respectively. The numerical and experimental results show that for the magnetic and thermal-induced Schemes, the frequency of point defect state increases monotonically with the increase of the defect magnetic field and temperature, respectively. By adjusting the magnetic and thermal distributions, the reconfigurable location of point defect can be obtained, the frequency decreases as the number of cells increases. This study provides a guidance for realizing the reconfigurable point defect state of elastic waves, which can be beneficial for the customized requirement of wave localization devices like wave guiding, monitoring and energy harvesting.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105415"},"PeriodicalIF":3.4,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271417","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