European Journal of Mechanics A-Solids最新文献

Change of microstructure and mechanical state in nano-sized wiredrawing: Molecular dynamics simulation of pure magnesium

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-04-01 DOI: 10.1016/j.euromechsol.2025.105660

Ken-ichi Saitoh , Shin'ichiro Mibu , Masanori Takuma , Yoshimasa Takahashi , Tomohiro Sato

{"title":"Change of microstructure and mechanical state in nano-sized wiredrawing: Molecular dynamics simulation of pure magnesium","authors":"Ken-ichi Saitoh , Shin'ichiro Mibu , Masanori Takuma , Yoshimasa Takahashi , Tomohiro Sato","doi":"10.1016/j.euromechsol.2025.105660","DOIUrl":"10.1016/j.euromechsol.2025.105660","url":null,"abstract":"<div><div>Microstructural changes of single-crystal and polycrystal pure magnesium (Mg) during wiredrawing process are studied using molecular dynamics (MD). Twinning, dislocation motions and microstructural changes are discussed. Miniaturized wiredrawing simulation is realized to mimic realistic three-dimensional drawing process of Mg and Mg alloys, where a conical and tapered die is placed and the wire is introduced in the die by applying velocity at both ends of the wire. The interatomic interaction by embedded atom method (EAM) for pure Mg is used, partly modifying in order to represent a sufficient lubrication between wire and die. For single-crystal, simulations changing crystal orientation for drawing direction are performed. For polycrystal, grain size and wire diameter are changed and compared. In single crystal models, a twinning having the same orientation occurs during drawing, except for the case dominated by slips on basal planes. In polycrystal simulations, the results show that plastic deformation of Mg wire consists of three atomistic mechanisms: (1) grain boundary sliding, (2) twinning, and (3) dislocation slip on basal plane. The occurrence of these behaviors strongly depends on grain sizes and a combination of the mechanism could be summarized for grain diameter between 2–40 nm. It is also found that a microstructure showing a typical texture is obtained for polycrystal models like that experimentally observed in drawn Mg wires. These analyses are successfully conducted by helpful post-analyses for MD such as polyhedral-template-matching (PTM) method and dislocation extraction algorithm (DXA), as well as newly-introduced Neo-Eulerian mapping (NEmap).</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105660"},"PeriodicalIF":4.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759746","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 3D visco-elasto-plastic damage constitutive model of concrete under long-term loads

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-31 DOI: 10.1016/j.euromechsol.2025.105646

Gianluca Mazzucco, Beaudin Freinrich Dongmo, Beatrice Pomaro, Jiangkun Zhang, Valentina Salomoni, Carmelo Majorana

{"title":"A 3D visco-elasto-plastic damage constitutive model of concrete under long-term loads","authors":"Gianluca Mazzucco, Beaudin Freinrich Dongmo, Beatrice Pomaro, Jiangkun Zhang, Valentina Salomoni, Carmelo Majorana","doi":"10.1016/j.euromechsol.2025.105646","DOIUrl":"10.1016/j.euromechsol.2025.105646","url":null,"abstract":"<div><div>The present paper proposes a 3D coupled elasto-plastic damage model of concrete, incorporating long-term effects at the meso-scale. The model is able to capture permanent deformations, stiffness reduction and creep characteristics of concrete in a unified manner, including local confinement effects and stress concentrations of the cement matrix at the meso-scale. The modelling aspect related to plasticity is based on the pressure-dependent Menétrey–Willam plastic surface, extended to include a scalar damage variable accounting for the reduction in size of the elastic domain as concrete undergoes damage. The modelling aspect related to damage, on the other side, is inspired by the formulation of the isotropic damage by Mazars. Specifically, in the proposed formulation a stress-dependent damage variable is introduced to account for crack closure effects. The long-term effects are taken into account via the B3 creep model by Bažant and Baweja. Some challenging aspects related to the numerical implementation and interaction of the afore-mentioned models are addressed, amongst which the choice of a suitable loading scheme for the numerical implementation of the coupled model, and the mathematical derivation of the visco-elasto-plastic tangent operator. Numerical simulations are performed at the meso-scale, with the cement matrix being characterized by means of the visco-elasto-plastic damage constitutive model developed herein. The calibration of the model is discussed, and the numerical results at the meso-scale prove that the present model is fairly well capable of reproducing the creep failure of concrete materials, even when subjected to high loading levels.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105646"},"PeriodicalIF":4.4,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769305","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

Multi-scale modeling of flexible piezoresistive porous sensors

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-30 DOI: 10.1016/j.euromechsol.2025.105651

Qing Ma, Ding-Yi Xiao, Yu-Xin Xie

引用次数: 0

Material parameter estimation enabled by adaptive deformable body simulation of continuum beam models and real-time visual tracking

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-28 DOI: 10.1016/j.euromechsol.2025.105636

Seongbeen Lee , Yewon Park , Suin Kim , Joo Yong Sim

{"title":"Material parameter estimation enabled by adaptive deformable body simulation of continuum beam models and real-time visual tracking","authors":"Seongbeen Lee , Yewon Park , Suin Kim , Joo Yong Sim","doi":"10.1016/j.euromechsol.2025.105636","DOIUrl":"10.1016/j.euromechsol.2025.105636","url":null,"abstract":"<div><div>This study introduces an advanced method for adaptive deformable body simulation using the Euler–Bernoulli beam model and the Timoshenko beam model, incorporating real-time material parameter estimation and visual tracking. The approach addresses significant challenges in accurately simulating the deformation of real-world materials, particularly in the presence of variable material properties and fabrication inconsistencies. By integrating advanced numerical techniques, including the Newmark method for time integration, and removing the reliance on traditional force sensors, this method facilitates dynamic, real-time simulations that closely replicate actual material behaviors. Experimental validation was performed using various materials, demonstrating substantial improvements in the accuracy of displacement predictions and the optimization of elastic modulus values. The results underscore the method’s potential for extensive application in fields requiring precise material modeling and dynamic simulation.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105636"},"PeriodicalIF":4.4,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746654","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

Crashworthiness analysis for bio-inspired hierarchical honeycomb combined with square and circular tubes

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-26 DOI: 10.1016/j.euromechsol.2025.105658

Yifei Sun , Zhigang Xu , Siyuan Li , Xiangnan Ma , Diao Yang , Hui Wang , Jian Peng , Qiang Shen , Chuanbin Wang

{"title":"Crashworthiness analysis for bio-inspired hierarchical honeycomb combined with square and circular tubes","authors":"Yifei Sun , Zhigang Xu , Siyuan Li , Xiangnan Ma , Diao Yang , Hui Wang , Jian Peng , Qiang Shen , Chuanbin Wang","doi":"10.1016/j.euromechsol.2025.105658","DOIUrl":"10.1016/j.euromechsol.2025.105658","url":null,"abstract":"<div><div>Inspired by the microstructure of European yew, bionic hierarchical honeycomb structures combining square and circular tubes (BHSCH) is proposed in this work. Through quasi-static compression experiments and finite element analysis, the energy absorption characteristics of BHSCHs of different orders were investigated under both in-plane and out-of-plane loading. The results indicated that the in-plane energy absorption properties of BHSCH relied on the buckling and collapse between cells, with higher-order BHSCHs demonstrating better energy absorption capabilities. In out-of-plane compression, the interaction between internal units of the BHSCH structure increased with higher order, leading to significantly enhanced energy absorption and maximum crushing force. Then, a theoretical compression model was used to calculate the average crushing stress of BHSCHs of each order and analyze their energy dissipation process. Good agreements were found between the predicted and numerical results with the error of less than 10 %, proving the reliability of the proposed model. By comparing the SEA with other honeycomb structures, the BHSCH exhibited excellent mechanical and energy absorption properties. Finally, the local impact resistance of BHSCHs was investigated, exploring the energy absorption capabilities of sandwich structures with different BHSCHs under the impact of small spheres at the same velocity.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105658"},"PeriodicalIF":4.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746653","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

The in-plane elastic-plastic response of hierarchical honeycombs with sandwich walls

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-25 DOI: 10.1016/j.euromechsol.2025.105648

Omar El Khatib , Andreas Schiffer

{"title":"The in-plane elastic-plastic response of hierarchical honeycombs with sandwich walls","authors":"Omar El Khatib , Andreas Schiffer","doi":"10.1016/j.euromechsol.2025.105648","DOIUrl":"10.1016/j.euromechsol.2025.105648","url":null,"abstract":"<div><div>We examine both theoretically and numerically the in-plane elastic-plastic response of hierarchical honeycombs composed of sandwich-structured cell walls. An analytical model was developed to predict the effective collapse stress of sandwich-structured honeycombs (SSHC) under in-plane uniaxial, biaxial and shear loading. The collapse of SSHCs was shown to occur by three competing mechanisms: core shear, face yielding and elastic buckling. Collapse mechanism maps were constructed showing dominance of core shear and face yielding collapse for metallic SSHCs with practical design parameters, while elastic buckling was only observed for polymeric SSHCs. The analytical predictions of the collapse load and dominant mechanism were found in good agreement with those obtained from detailed finite element calculations for a range of geometrical and material parameters. Moreover, the analytical model was used to determine optimal architectural parameters that maximize the collapse stress for a range of relative densities, concluding that slender sandwich walls with relatively thick faces yield optimal performance for SSHCs with weak cores and low relative densities (<10 %). Lastly, it was found that SSHCs attain higher collapse stresses by up to 600 % for certain designs compared to conventional monolithic honeycombs of equal relative density.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105648"},"PeriodicalIF":4.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746659","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

Additive manufacturing of adaptive architected structures for enhanced protective equipment

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-25 DOI: 10.1016/j.euromechsol.2025.105649

Cristina Machín Llanos, Daniel Saakes, Mehrshad Mehrpouya

引用次数: 0

Effects of high-cycle fatigue on the viscoelastic properties of epoxy resin

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-22 DOI: 10.1016/j.euromechsol.2025.105641

Mahdi Tayyebati , Ali Sarhadi , Anthony Fraisse , Kristoffer Almdal , Martin A. Eder

{"title":"Effects of high-cycle fatigue on the viscoelastic properties of epoxy resin","authors":"Mahdi Tayyebati , Ali Sarhadi , Anthony Fraisse , Kristoffer Almdal , Martin A. Eder","doi":"10.1016/j.euromechsol.2025.105641","DOIUrl":"10.1016/j.euromechsol.2025.105641","url":null,"abstract":"<div><div>In this work, the effects of high-cycle fatigue on the viscoelastic properties of a commercially available epoxy resin material were investigated experimentally. Specimens produced from neat epoxy material were split into two batches designated as pristine and fatigued. The specimens of the latter batch were subjected to a high-cycle fatigue loading under different stress amplitudes with a constant stress ratio of <span><math><mrow><mi>R</mi><mo>=</mo><mi>0.1</mi></mrow></math></span> until failure. The storage and loss modulus, loss factor, and glass transition temperature (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>g</mi></mrow></msub></math></span>) of the pristine and fatigued specimens were measured using dynamic mechanical analysis. Complementary temperature-modulated differential scanning calorimetry was employed to analyze the changes in <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>g</mi></mrow></msub></math></span> of the pristine and fatigued specimens. A systematic comparison of the pristine and fatigued materials strongly indicates that changes in the viscoelastic material properties before and after fatigue loading were statistically insignificant. The findings strongly corroborate the hypothesis that, within the tested stress ratio, the viscoelastic properties of the tested epoxy resin remain independent of the mechanically applied load cycles in the high-cycle fatigue regime.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105641"},"PeriodicalIF":4.4,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696902","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

An experimental and FEA investigation of deformation characteristics of additively manufactured Ti6Al4V lattice structures

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-22 DOI: 10.1016/j.euromechsol.2025.105657

Gürkan Kaya , Fatih Yıldız , Kemal Solak , Süleyman Nazif Orhan

{"title":"An experimental and FEA investigation of deformation characteristics of additively manufactured Ti6Al4V lattice structures","authors":"Gürkan Kaya , Fatih Yıldız , Kemal Solak , Süleyman Nazif Orhan","doi":"10.1016/j.euromechsol.2025.105657","DOIUrl":"10.1016/j.euromechsol.2025.105657","url":null,"abstract":"<div><div>This study presents a comprehensive experimental and numerical investigation of the mechanical properties and deformation characteristics of additively manufactured Ti6Al4V lattice structures fabricated via Laser Powder Bed Fusion (L-PBF). Two lattice configurations, face-centred cubic (FCC-Z) and body-centred cubic (BCC-Z), both containing struts oriented along the X, Y, and Z directions, were designed with varying porosity levels of 50 %, 60 %, 70 %, and 80 %. The static compression tests were conducted to evaluate the compressive strength, deformation behaviour, and energy absorption capabilities of the lattice structures. Additionally, finite element analysis (FEA) was employed to simulate the deformation mechanisms and predict the mechanical responses under compressive loads. The results revealed that as porosity decreased, both FCC-Z and BCC-Z structures demonstrated increased compressive strength and energy absorption efficiency. Notably, the FCC-Z lattices exhibited superior mechanical performance in terms of compressive strength, specific energy absorption (SEA), and crushing force efficiency (CFE) compared to the BCC-Z lattices. The deformation mechanisms were characterised by layer-by-layer fractures in FCC-Z structures and shear band formation in BCC-Z structures. Furthermore, the FEA results closely aligned with the experimental data, validating the accuracy of the simulation in predicting peak forces, displacement trends, and failure mechanisms. This work provides new insights into the optimisation of Ti6Al4V lattice structures, particularly for applications requiring high energy absorption and mechanical efficiency, such as in the biomedical and aerospace sectors.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105657"},"PeriodicalIF":4.4,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746657","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

High-velocity impact and post-impact fatigue response of Bismaleimide resin composite laminates

IF 4.4 2区工程技术

European Journal of Mechanics A-Solids Pub Date : 2025-03-22 DOI: 10.1016/j.euromechsol.2025.105655

Zhenhua Zhao , Fengrui Liu , Xin Yang , Zhihao Xie , Lulu Liu , Wei Chen

{"title":"High-velocity impact and post-impact fatigue response of Bismaleimide resin composite laminates","authors":"Zhenhua Zhao , Fengrui Liu , Xin Yang , Zhihao Xie , Lulu Liu , Wei Chen","doi":"10.1016/j.euromechsol.2025.105655","DOIUrl":"10.1016/j.euromechsol.2025.105655","url":null,"abstract":"<div><div>Bismaleimide (BMI) resin composite is a kind of thermoplastic composite that has attracted a lot of attention for its advantages in fracture toughness and damage tolerance. The composite structures are usually exposed to the threat of foreign object impact during service; static strength and fatigue resistance of composite structures with impact damage will dramatically degrade, which can lead to catastrophic damage of composite structures. In this paper, the hard foreign objects and air cannon were used to conduct a high-speed impact test on the BMI composite laminate. The effect of impactor diameter, impact velocity, and impact angle on impact damage size and microscopic damage mechanism was investigated; respectively, the results show that damage width and length increase with the growth of impact velocity and impactor size, the impact velocity has a greater impact on damage depth, and various impact angles will significantly change the damage morphology. After impact, the step-by-step method was used to analyze the fatigue strength of composite laminates with impact damage; it was found the depth of impact damage has the biggest impact on the fatigue strength. Based on conclusions of the fatigue test, a prediction model was proposed to predict the fatigue strength of composite laminate with the impact damages; the results show that prediction results are within 1.5 times of the error band. This paper reveals the damage behavior of composite laminate under high-speed impact; the proposed fatigue strength prediction method can provide a reference for the safety evaluation of composite structures.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105655"},"PeriodicalIF":4.4,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704951","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