European Journal of Mechanics A-Solids最新文献_第9页

A thermodynamic framework for ductile phase-field fracture and gradient-enhanced crystal plasticity 韧性相场断裂和梯度增强晶体塑性的热力学框架

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-12 DOI: 10.1016/j.euromechsol.2024.105418

Kim Louisa Auth , Jim Brouzoulis , Magnus Ekh

{"title":"A thermodynamic framework for ductile phase-field fracture and gradient-enhanced crystal plasticity","authors":"Kim Louisa Auth , Jim Brouzoulis , Magnus Ekh","doi":"10.1016/j.euromechsol.2024.105418","DOIUrl":"10.1016/j.euromechsol.2024.105418","url":null,"abstract":"<div><p>This study addresses ductile fracture of single grains in metals by modeling of the formation and propagation of transgranular cracks. A proposed model integrates gradient-extended hardening, phase-field modeling for fracture, and crystal plasticity. It is presented in a thermodynamical framework in large deformation kinematics and accounts for damage irreversibility. A micromorphic approach for variationally and thermodynamically consistent damage irreversibility is adopted. The main objective of this work is to analyze the capability of the proposed model to describe transgranular crack propagation. Further, the micromorphic approach for damage irreversibility is evaluated in the context of the presented ductile phase-field model. This is done by analyzing the impact of gradient-enhanced hardening considering micro-free and micro-hard boundary conditions, studying the effect of the micromorphic regularization parameter, evaluating the performance of the model in ratcheting loading and testing its capability to predict three-dimensional crack propagation. In order to solve the fully coupled global and local equation systems, a staggered solution scheme that extends to the local level is presented.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105418"},"PeriodicalIF":4.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0997753824001980/pdfft?md5=4f086ee34a79aa1f4aef62a32d394336&pid=1-s2.0-S0997753824001980-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142044925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Derivation of elastic and inelastic characteristics of non-periodic masonry using homogenization techniques and micro-modelling approaches 利用均质化技术和微观建模方法推导非周期性砌体的弹性和非弹性特性

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-11 DOI: 10.1016/j.euromechsol.2024.105416

Giulio Castori

{"title":"Derivation of elastic and inelastic characteristics of non-periodic masonry using homogenization techniques and micro-modelling approaches","authors":"Giulio Castori","doi":"10.1016/j.euromechsol.2024.105416","DOIUrl":"10.1016/j.euromechsol.2024.105416","url":null,"abstract":"<div><p>The present study is aimed to develop an ad hoc four-steps procedure, based on the use of Digital Image Processing (DIP) techniques, homogenization methods and micro-modelling approaches, able to provide an effective tool for characterizing the mechanical properties of non-periodic masonry. More in detail, after creating, through a DIP technique and automated procedures, a finite element mesh from the Red-Green-Blue (RGB) image of a real masonry wall with non-periodic texture (Step 1 and Step 2), a homogenization method, which considers the properties of each masonry constituent (stone units and mortar joints), is used to derive the main elastic characteristics of a homogeneous continuum equivalent to the random masonry (Step 3). Specifically, this estimate can be achieved following the test-windows method based on the use of least-sized partitions subjected to boundary conditions in terms of displacements or stresses until a chosen convergence criterion is fulfilled. The non-linear response is then accomplished by means of a micro-modelling approach (Step 4). To this end, a three-dimensional finite element (FE) analysis can be therefore developed to characterize the main inelastic material parameters of the random masonry. Lastly, as a benchmark of the method, the proposed procedure has been validated against the laboratory outcomes obtained from a previous experimental campaign on non-periodic masonry walls.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105416"},"PeriodicalIF":4.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0997753824001967/pdfft?md5=bf7dd3c440862f8341fc17829a9296be&pid=1-s2.0-S0997753824001967-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141992969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis on shear band development under large strain torsion of amorphous glassy polymers 无定形玻璃态聚合物在大应变扭转下的剪切带发展分析

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-08 DOI: 10.1016/j.euromechsol.2024.105415

Kaixing Li , Wujiao Xu , Peidong Wu , Yonggang Liu

{"title":"Analysis on shear band development under large strain torsion of amorphous glassy polymers","authors":"Kaixing Li , Wujiao Xu , Peidong Wu , Yonggang Liu","doi":"10.1016/j.euromechsol.2024.105415","DOIUrl":"10.1016/j.euromechsol.2024.105415","url":null,"abstract":"<div><p>Unlike the shear band development of metals generally regarded as the precursor to failure, the shear banding process in amorphous glassy polymers is known to influence both the strengthening and fracturing behaviors. Complementary to the previous experimental work in the literature on the shear band development under torsion under limited cases, the finite element (FE) analysis has been conducted to investigate the general shear banding behaviors in terms of the initiation and propagation in more detail. The FE model has been established by incorporating the Boyce-Parks-Argon (BPA) constitutive model with the full-network modification via a user material subroutine in ABAQUS. A series of nondimensional quantities were used to discuss the mesh sensitivity and the effects of predefined imperfections, specimen geometry, and torsion mode. Besides, by altering the extents of the intrinsic material softening and the strain hardening, the shear banding behaviors of typical materials under typical temperature and strain rate conditions are equivalently investigated. The validity of the simulation has been qualitatively validated by directly comparing with the experimental results from the literature.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105415"},"PeriodicalIF":4.4,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142012188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An innovative bond–based peridynamic model for fracture analysis of orthotropic materials 用于正交各向同性材料断裂分析的基于粘接的创新围动力模型

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-08 DOI: 10.1016/j.euromechsol.2024.105414

Jinwei Guan, Li Guo

{"title":"An innovative bond–based peridynamic model for fracture analysis of orthotropic materials","authors":"Jinwei Guan, Li Guo","doi":"10.1016/j.euromechsol.2024.105414","DOIUrl":"10.1016/j.euromechsol.2024.105414","url":null,"abstract":"<div><p>Fracture analysis of orthotropic materials presents a persistent challenge in computational mechanics, particularly in bond–based peridynamics (BB–PD) framework. This challenge arises from the special material properties of orthotropic materials, presenting difficulties in accurately simulating the mechanical behavior and discerning fracture modes. In particular, the neglect of fracture parameters that profoundly affect the fracture behavior has resulted in an insufficient study of the fracture mechanisms for orthotropic materials. To address this issue, a novel BB–PD model for orthotropic materials was proposed, accompanied by the development of an energy–based failure criterion. The presented BB–PD model has no material parameter limitations and can accurately capture the deformation of orthotropic materials. The energy–based failure criterion considers the variation of fracture energy in different directions and fracture modes, ensuring that the PD calculated fracture energies align with their corresponding theoretical values. To validate the effectiveness of the developed BB–PD model and failure criterion, several numerical examples were performed, including convergence analysis, deformation analysis, and three quasi-static fracture analyses. The results demonstrate that the presented model and failure criterion can accurately predict material deformation and fracture. Furthermore, analysis of fracture modes indicates that the ratio of mode I and mode II fracture energies significantly influences crack paths and fracture modes in orthotropic materials.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105414"},"PeriodicalIF":4.4,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141953829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tensile behavior of CoCrFeMnNi high-entropy alloy with intermediate strain rate included 包含中间应变率的 CoCrFeMnNi 高熵合金的拉伸行为

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-06 DOI: 10.1016/j.euromechsol.2024.105412

Bing Du , Yi Ding , Xin Bai , Muhammad Atif , Dongyang Qin , Yulong Li

{"title":"Tensile behavior of CoCrFeMnNi high-entropy alloy with intermediate strain rate included","authors":"Bing Du , Yi Ding , Xin Bai , Muhammad Atif , Dongyang Qin , Yulong Li","doi":"10.1016/j.euromechsol.2024.105412","DOIUrl":"10.1016/j.euromechsol.2024.105412","url":null,"abstract":"<div><p>High-entropy alloys (HEAs) have garnered considerable attention for their exceptional mechanical properties, positioning them as promising candidates for diverse industrial applications. This study investigates the mechanical properties of CoCrFeMnNi HEAs over a wide range of strain rates. Based on a novel electromagnetic loading device equipped with high-speed photography, intermediate strain rate tests of the HEAs are conducted. The intermediate strain rate test results show the effectiveness of the experiments. Experimental results exhibit a remarkable strain rate sensitivity of the HEA during tension tests. Microstructural analysis reveals the collaborative interplay between deformation twins and dislocations, enhancing strength-plasticity relationships under tension loading. Finally, a constitutive model (M-JCK) integrated by Johnson-cook model and KHL model is proposed to describe the mechanical behavior of HEAs. The results demonstrate that the M-JCK model outperforms traditional models, providing enhanced accuracy in capturing the complex responses of HEAs across varying strain rates.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105412"},"PeriodicalIF":4.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142002058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical modeling, solution and experimental validation of high-velocity impact properties of composite hexagonal auxetic honeycomb cylindrical shells 复合六边形辅助蜂窝圆柱壳高速冲击特性的分析建模、求解和实验验证

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-08-06 DOI: 10.1016/j.euromechsol.2024.105413

Hui Li , Yichen Deng , Zelin Li , Jin Zhou , Haijun Wang , Shaoming Wang , Haiyang Zhang , Hang Cao , Xiangping Wang , Qingkai Han , Zhongwei Guan

{"title":"Analytical modeling, solution and experimental validation of high-velocity impact properties of composite hexagonal auxetic honeycomb cylindrical shells","authors":"Hui Li , Yichen Deng , Zelin Li , Jin Zhou , Haijun Wang , Shaoming Wang , Haiyang Zhang , Hang Cao , Xiangping Wang , Qingkai Han , Zhongwei Guan","doi":"10.1016/j.euromechsol.2024.105413","DOIUrl":"10.1016/j.euromechsol.2024.105413","url":null,"abstract":"<div><p>Both theoretical and experimental studies are performed to investigate the impact properties of composite hexagonal auxetic honeycomb cylindrical shells subjected to an internal high-velocity projectile impact. Firstly, an analytical model of composite cylindrical shells with two fiber-reinforced polymer (FRP) skins and a hexagonal auxetic honeycomb core (HAHC) is built to anticipate the high-velocity impact properties, with the delamination and fracture energy absorption mechanisms of the skin and the core being considered. A strain-rate fitting function method is proposed to determine the material properties of the FRP skins and the core considering the strain-rate effect. Reddy's higher-order shear deformation theory is utilized to define the displacement of any point of the structure. Also, an improved Gibson theory is applied to derive the equivalent elastic moduli and Poisson's ratios of the HAHC. A detailed experimental validation is conducted on such shell specimens based on a high-velocity impact experimental system to validate the analytical model, in which comprehensive error analysis is discussed. Finally, the influence of critical geometric parameters of the projectile and the studied shell on its impact characteristics is evaluated and some crucial conclusions are provided to enhance impact resistance.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105413"},"PeriodicalIF":4.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141953828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A unified nonlinear yield criterion for fracture and fault slip in quasi-brittle rocks 准脆性岩断裂和断层滑移的统一非线性屈服准则

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-07-31 DOI: 10.1016/j.euromechsol.2024.105411

Tao You , Lun-Yang Zhao

引用次数: 0

Macroscopic modeling of flexoelectricity-driven remanent polarization in piezoceramics 压电陶瓷中挠曲电驱动的剩磁极化的宏观建模

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-07-29 DOI: 10.1016/j.euromechsol.2024.105410

Felix Sutter, Marc Kamlah

{"title":"Macroscopic modeling of flexoelectricity-driven remanent polarization in piezoceramics","authors":"Felix Sutter, Marc Kamlah","doi":"10.1016/j.euromechsol.2024.105410","DOIUrl":"10.1016/j.euromechsol.2024.105410","url":null,"abstract":"<div><p>This paper presents a variational modeling framework for investigating the flexoelectricity-driven evolution of remanent polarization in piezoceramics. In small-scale electromechanical systems, strain gradients can exhibit polarization in dielectric materials via the direct flexoelectric effect. In ferroelectrics, it is reasonable to expect that a sufficiently large magnitude of the flexoelectricity leads to a switching of the domain structure and thus the material becomes remanently polarized. It is interesting to note that this means that poling would be able to occur in the absence of any external electrical source. This provides the motivation to gain a better understanding of this effect for a possible technical use in e.g. sensor applications. For this purpose, a macroscopic model is presented that couples flexoelectricity and ferroelectric domain switching processes. By embedding the model in the variational framework of the generalized standard materials (GSM), a minimum-type potential structure and thus a stable and efficient numerical treatment is obtained. A mixed finite element formulation based on the Helmholtz free energy is introduced to solve the higher-order flexoelectric boundary value problem. In order to realistically predict the flexoelectric material behavior, the model response is adapted to experimental results in literature obtained for a piezoceramic in a bending test. By simulations based on the adapted model the evolution of the flexoelectricity-driven remanent polarization in the vicinity of a notch is shown.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105410"},"PeriodicalIF":4.4,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0997753824001906/pdfft?md5=1d3ed822042bb6c1c2ec56d8dad79dc2&pid=1-s2.0-S0997753824001906-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hierarchical design of auxetic metamaterial with peanut-shaped perforations for extreme deformation: Self-similar or not? 分层设计具有花生形穿孔的辅助超材料，以实现极端变形：自相似与否？

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-07-25 DOI: 10.1016/j.euromechsol.2024.105402

Jingying Qu, Yongpeng Lei, Qinxi Dong, Hui Wang

{"title":"Hierarchical design of auxetic metamaterial with peanut-shaped perforations for extreme deformation: Self-similar or not?","authors":"Jingying Qu, Yongpeng Lei, Qinxi Dong, Hui Wang","doi":"10.1016/j.euromechsol.2024.105402","DOIUrl":"10.1016/j.euromechsol.2024.105402","url":null,"abstract":"<div><p>Hierarchical designs have exhibited great potential in reducing structural weight and improving mechanical properties. However, the hierarchical design of perforated auxetic metamaterials with curved holes is rarely investigated and the choice of self-similar hierarchical design or not still confuses us. In this study, two types of hierarchical designs with self-similar and non-self-similar features for the auxetic metamaterial with peanut-shaped perforations are realized and compared. First, the printed hierarchical auxetic metamaterials via additive manufacturing technology are tested by quasi-static tension to explore their mechanical performance in different directions. Correspondingly, the computational homogenization model is established to characterize their full elastic properties and its effectiveness is verified by the experimental results. Subsequently, the deformation mechanisms of the proposed hierarchical metamaterials are numerically analyzed to address the superiority of self-similar design over the non-self-similar design. Finally, the influences of microstructural parameters and hierarchy order on the effective elastic constants of the proposed hierarchical metamaterial are considered and the optimal topology with extreme auxetic behavior is recommended. The results indicate that the proposed self-similar hierarchical design exhibits significant anisotropic feature, which can serve the multidirectional mechanical requirements, and the remarkable enhancement in auxeticity can be attributed to the synergistic deformation of tetrachiral sub-elements. Besides, the increase of hierarchy order does not continuously enhance the auxetic behavior of hierarchical metamaterial, although it can effectively change the porosity of structure. Through such investigations, a meaningful guidance of property map is provided for the hierarchical design of auxetic metamaterial perforated by curved cuts.</p></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"108 ","pages":"Article 105402"},"PeriodicalIF":4.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Schapery nonlinear viscoelastic model: A review 沙佩里非线性粘弹性模型：综述

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2024-07-22 DOI: 10.1016/j.euromechsol.2024.105403

M. Jamshidi, M.M. Shokrieh

引用次数: 0