Tim Furlan , Markus Schewe , Philipp Scherm , Philipp Retzl , Ernst Kozeschnik , Andreas Menzel
{"title":"Modelling and finite element simulation of martensite and bainite phase transformations during quenching under consideration of carbon repartitioning","authors":"Tim Furlan , Markus Schewe , Philipp Scherm , Philipp Retzl , Ernst Kozeschnik , Andreas Menzel","doi":"10.1016/j.mechmat.2025.105275","DOIUrl":"10.1016/j.mechmat.2025.105275","url":null,"abstract":"<div><div>Control of the microstructure of steel components during their processing is a crucial factor for reaching desired product properties. Realistic simulations of the microstructure evolution during processing can facilitate the improvement of existing processes as well as the design of new ones by reducing the need for time- and cost-intensive experimental investigations. This work focuses on the modelling and advanced simulation of quenching of components made of the high-carbon bearing steels 100Cr6 and 100CrMnSi6-4, during which transformations from austenite to martensite and bainite are considered. Special attention is given to the carbon-enrichment of the austenite phase during the formation of carbide-free bainite, since the change in carbon content also changes the martensite start temperature. A novel model based on the widely used Koistinen–Marburger and Johnson–Mehl–Avrami–Kolmogorov models is proposed, which explicitly takes into account the carbon contents of the remaining austenite and its influence on the kinetics of both transformations. The proposed model is implemented as a user material for the commercial finite element software Abaqus. Our source code and calibration data are available at <span><span>https://github.com/InstituteOfMechanics/Phase_Trafos_Carbon_Repartitioning</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"204 ","pages":"Article 105275"},"PeriodicalIF":3.4,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430215","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}
{"title":"Plastic behavior of additively manufactured Ti6Al4V ELI: Mechanical characterization, engineering scale modeling, and validation using free-end torsion tests","authors":"Luca Corallo , Oana Cazacu , Raffaele Barbagallo , Giuseppe Mirone","doi":"10.1016/j.mechmat.2025.105291","DOIUrl":"10.1016/j.mechmat.2025.105291","url":null,"abstract":"<div><div>This paper is devoted to the study of Ti6Al4V ELI (Extra Low Interstitials) processed by electron beam melting (EBM). The experimental investigation includes quasi-static uniaxial tension and compression tests and free-end torsion tests. It was found that the horizontally and vertically printed specimens have the same yield stresses and similar overall stress-strain response. Irrespective of the printing direction the material displays strength differential effects. During monotonic compression tests, a slight anisotropy in plastic strains in compression was revealed by online optical measurements. This slight anisotropy was confirmed by conducting interrupted compression tests and further measuring the deformed cross-sections. Although the material anisotropy is weak, the torsional response cannot be captured with the von Mises yield function. On the other hand, using the isotropic Cazacu and Barlat (2004) yield function that involves only one additional parameter that can be determined solely from uniaxial tension and compression tests, both strength differential effects and the material's torsional response are predicted with accuracy. Furthermore, a transversely isotropic extension of this yield criterion involving only two additional anisotropy coefficients that can be determined using analytical formulas from uniaxial data, enables to account for both the mild anisotropy and the material's tension compression asymmetry and to obtain good predictions for all test conditions investigated.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105291"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378016","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}
{"title":"Effective strain in simple shear deformation considering material anisotropy","authors":"Kanghwan Ahn","doi":"10.1016/j.mechmat.2025.105290","DOIUrl":"10.1016/j.mechmat.2025.105290","url":null,"abstract":"<div><div>The effective strain in simple shear was explored with material anisotropy by providing its mathematical expression. Based on large deformation theory, the kinematics of simple shear was analyzed with discretization of the deformation process and decomposition of the deformation gradient, from which expressions that can be practically utilized for evaluating effective strain were derived for simple shear. Material anisotropy was considered by using the quadratic anisotropic yield function with Lankford values. It was found that the effective strain in simple shear can be accurately estimated as the number of the discretized deformation steps approaches infinity. It was verified that the derived expression can also be obtained from other approaches based on the co-rotational rate of deformation tensor and the plastic work equivalence, respectively. To demonstrate its application, the effective strains of several anisotropic metals made of steel alloys and aluminum alloys were evaluated using the developed expression. It was found that the effective strain of the extruded aluminum profile differs significantly from those of the other metals due to its strong planar anisotropy. This result demonstrates that the effective strain in simple shear can be significantly influenced by material anisotropy. Further investigations were conducted on the evaluation of effective strain in cases where simple shear is approximated by a finite number of increments, deriving relevant expressions for effective strain. Effective strains calculated from these expressions showed good correlations with those obtained from the incremental computations using the commercial finite element software Abaqus/Standard.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"205 ","pages":"Article 105290"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681514","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}
{"title":"Constitutive modeling of diffusion-limited oxidation coupled with a large deformation theory for polymer degradation","authors":"Hossein Naderi, Roozbeh Dargazany","doi":"10.1016/j.mechmat.2025.105270","DOIUrl":"10.1016/j.mechmat.2025.105270","url":null,"abstract":"<div><div>The influence of oxidation on the degradation of polymers is one of the most critical aging processes. The oxidation is usually limited to the sample’s surface, commonly called diffusion-limited oxidation (DLO). DLO occurs through the competition of simultaneous oxygen absorption, diffusion transport, and the reaction of oxygen in the elastomers. A new kinetics-based oxygen absorption model is developed and validated against multiple experimental data. In addition, the diffusion-reaction equation is extended in 3 dimensions and solved by the Alternating Direction Implicit (ADI) method. Various reaction rate functions are considered for chain scission and network reformation reactions to describe non-uniform degradation. An enhanced model is utilized to simulate the heterogeneous oxidation and to demonstrate the influence of contributing factors on the oxidation behavior of nitrite rubber. Our proposed model’s results agree with the empirical data on polymers’ oxidation degree. In addition, a constitutive model is developed that incorporates the coupling between diffusion, chemical reaction, and large deformation of polymers. The finite element implementation of the coupled multi-physics is explained in detail. The proposed constitutive model illustrates the effect of diffusion-limited oxidation (DLO) on the mechanical properties of cross-linked polymers. It numerically analyzes the coupled diffusion–reaction and mechanical behavior of polymers undergoing DLO.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105270"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387418","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}
{"title":"Process-structure-mechanical property relationships in Cu-Zr nanoglass: Insights from molecular dynamics","authors":"Alireza Edalatmanesh, Maryam Mahnama","doi":"10.1016/j.mechmat.2025.105274","DOIUrl":"10.1016/j.mechmat.2025.105274","url":null,"abstract":"<div><div>Nanoglasses (NGs) as a novel type of amorphous material with tunable microstructure have paved the way for engineering the structure of amorphous materials with tailored performance. Central to this effort is modifying microstructural features (through altering processing routes), which is made possible by a comprehensive understanding of process-structure-properties relationships. Research on NGs has frequently limited its scope to specific processing parameters or focused solely on identifying trends. This study provides a comprehensive investigation of the process-structure-mechanical property relationships in Cu-Zr NGs by employing molecular dynamics simulations. It focuses on how main process parameters like temperature, glass quenching rate, core grain size, and composition affect NGs' structural characteristics and mechanical behavior. The findings indicate that process parameters such as temperature, glass quenching rate, and composition substantially affect atomic volume profiles and the formation of Voronoi clusters. Conversely, grain size specifically influences the volume fractions of the constituent phases. Analysis of NGs’ mechanical responses under diverse processing parameters reveals that generally, any process parameters that induce excess free volume along with loosely-packed clusters result in lower ultimate strength and a softer elastic response. Additionally, the post-ultimate tensile strength behavior and degree of homogeneous plasticity in NGs are primarily influenced by the grain size. Moreover, investigation of deformation mechanisms reveals three phases: the nucleation of shear-activated atoms, the activation of shear transformation zones, and the shear localization. The findings lay the groundwork for the material design of NGs with enhanced mechanical performance through controlling processing conditions, offering practical applications in harsh environments.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105274"},"PeriodicalIF":3.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420341","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}
Weilin Shi , Yuheng Liu , Haibao Lu , Yong-Qing Fu
{"title":"Force-induced length-change effect of macromolecular chains undergoing mechanochemical coupling and mechanical behaviors under uniaxial tension in soft hydrogels","authors":"Weilin Shi , Yuheng Liu , Haibao Lu , Yong-Qing Fu","doi":"10.1016/j.mechmat.2025.105276","DOIUrl":"10.1016/j.mechmat.2025.105276","url":null,"abstract":"<div><div>Study on length-change effect in macromolecular chains is of critical importance for understanding mechanical behaviors of soft hydrogels, but mechanisms of force-induced transitions in macromolecular chains in soft hydrogels have not been fully understood due to their complex thermodynamics and kinetics. Herein, a globule-coil transition model is proposed to describe the force-induced length-change effect in macromolecular chains, of which the rubber elasticity and stiffening principles in hydrogels are investigated. A molecular model is firstly formulated to capture the microscopic physical mechanisms of the length-change effect based on the renormalized blob theory, and a free-energy equation is then proposed to characterize the globule-coil transition of macromolecular chains and rubber elasticity of polymer networks, based on the Flory-Huggins theory, entropic elasticity model, tube model and linear spring model. A kinetic equation for the force-induced globule-coil transition in macromolecular chains is further developed to describe the length-change effect, solved by finite difference method (FDM). Finally, quantitative comparisons have been conducted and good agreements have been achieved between the analytical results of proposed model and experimental data reported in literature. Our study provides a new perspective towards fully understanding of the length-change effect in macromolecular chains, rubbery elasticity, and stiffening principles in soft hydrogels undergoing mechanochemical coupling.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105276"},"PeriodicalIF":3.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387254","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}
L.B. Hu , X. Zhou , R.Z. Zhang , Z.-Q. Xiao , Y. Cong , S.T. Gu
{"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}
Aliae Welander , Isak Kinnunen , Anders Daneryd , Jan Hajek , Kiran Sahu , Mahmoud Mousavi
{"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}
Andrea Vigliotti , Ferdinando Auricchio , Damiano Pasini
{"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}
Xiaodong Xia , Yang Liu , Shilin Huang , Jianyang Luo , George J. Weng
{"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}