Mechanics Research Communications最新文献

{"title":"Repercussions of quasi-isotropic behavior emerging in FGMs obtained via FAST/SPS","authors":"Hassan Mohamed Abdelalim Abdalla","doi":"10.1016/j.mechrescom.2024.104360","DOIUrl":"10.1016/j.mechrescom.2024.104360","url":null,"abstract":"<div><div>The increasing use of functionally graded materials (FGMs) has propounded their careful consideration for high performance engineering applications. This interest has been largely nurturing challenging applications and prospects in various scientific and technological fields due to the increasing number of available fabrication processes. Among all, field assisted sintering technology (FAST), also known as spark plasma sintering (SPS), has been demonstrated as an efficient method for their throughput fabrication. In this regard, understanding the properties of these advanced sintered materials is critical to serve as the baseline for their development and optimization. Recently, a few peculiar experimental correlations of FGMs to their monolithic equivalents, when exclusively obtained by FAST/SPS, have been documented in the literature. In particular, a moderate anisotropic behavior of sintered samples is observed, though the existing gradient structure due to the spatial variation of volume fraction of reinforcing particles. This paper primarily aims to establish a theoretical criterion by taking advantage of the claimed moderate anisotropy of FGMs and provide a quantitative assessment tool for their effective elastic properties. Repercussions are stated, theoretically formulated, discussed and validated with reference to a set of experimental measures.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"143 ","pages":"Article 104360"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A homogenization scheme for viscoplastic composites based on the plane-wave decomposition of constitutive potentials","authors":"Martín I. Idiart ,&nbsp;Loïc Chaix ,&nbsp;Pedro Ponte Castañeda","doi":"10.1016/j.mechrescom.2024.104349","DOIUrl":"10.1016/j.mechrescom.2024.104349","url":null,"abstract":"<div><div>A homogenization scheme for nonlinear viscoplastic composites is developed on the basis of a plane-wave decomposition of the constitutive potentials and a scalar linearization of the generalized-secant type. Self-consistent predictions for rigidly reinforced blends flowing in accordance with a power law are reported and confronted to similar predictions obtained with a tensorial linearization of the same generalized-secant type. The two sets of predictions are found to agree for weak nonlinearities but to diverge for strong nonlinearities. Implications are discussed.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"142 ","pages":"Article 104349"},"PeriodicalIF":1.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing multistable metamaterials inspired by Kresling tubes","authors":"Emilio Turco ,&nbsp;Antonio Bilotta","doi":"10.1016/j.mechrescom.2024.104348","DOIUrl":"10.1016/j.mechrescom.2024.104348","url":null,"abstract":"<div><div>Multistable metamaterials have several relevant technical applications in various fields, such as soft robotics, mechanical computing, energy absorption, and wave control. These capabilities arise from the stored strain energy, characterised by a multi-well pattern. The properties determining this multistable mechanical behaviour are studied by considering metamaterials built as assemblies of unit modules constituted by Kresling tubes, <em>i.e.</em> tubes largely inspired by origami, which, when accurately designed, are bistable. Moreover, the assembly of properly designed units allows to obtain mats of Kresling tubes characterised by multiple stable states which can be maintained without providing additional energy. The present investigation exploits geometrical insights and computational modelling to highlight the most important circumstances determining the multistable mechanical response of these kind of structures.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"142 ","pages":"Article 104348"},"PeriodicalIF":1.9,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recurrent neural networks as a physics-based self-learning solver to satisfy plane stress viscoplasticity undergoing isotropic damage","authors":"Saurabh Balkrishna Tandale,&nbsp;Prashant Sharma,&nbsp;Vasileios Polydoras,&nbsp;Marcus Stoffel","doi":"10.1016/j.mechrescom.2024.104347","DOIUrl":"10.1016/j.mechrescom.2024.104347","url":null,"abstract":"<div><div>The present study introduces a new self-learning framework based on a recurrent neural network to compute the nonlinear viscoplastic response of plate structures undergoing isotropic damage. The neural network comprising Legendre Memory Unit (LMU) cells and dense transformations is pretrained with a combination of data-driven and physics-based loss functions. Once pretrained, the model is deployed in the explicit integration scheme to predict the strain increment in the thickness direction satisfying plane stress condition. This results in elimination/reduction in the iterations required to fulfill the plane stress condition and leads to faster convergence since the neural network replaces the root-finding methods. The proposed self-learning method differentiates itself from the well-known Physics-Informed Neural Networks (PINNs) since the neural network model self-learns online through the proposed physics-based loss term without the need for data. We compare the results of the Neural Network-enhanced integration scheme to validate the proposed method with those of the classical explicit integration scheme.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"142 ","pages":"Article 104347"},"PeriodicalIF":1.9,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The implementation of M-integral in cross-scale correlation analysis of porous materials","authors":"Junling Hou ,&nbsp;Jiahui Hu ,&nbsp;Xicheng Cao ,&nbsp;Xingming Peng ,&nbsp;Qun Li ,&nbsp;Chunguang Wang","doi":"10.1016/j.mechrescom.2024.104337","DOIUrl":"10.1016/j.mechrescom.2024.104337","url":null,"abstract":"<div><div>The damage analysis caused by mesoscopic pores has attracted much attention in the development and application of porous materials. In this study, a novel application of <em>M</em>-integral is presented to establish a cross-scale correlation analysis of damaged porous materials. The multiscale damage analysis featured here can be proposed in two main steps. In detail, the first step is to construct a quantitative relationship between <em>M</em>-integral and porosity, where the values of <em>M</em>-integral for different porosity are calculated numerically. Subsequently, it applies the variation of <em>M</em>-integral with the material damage represented by a decrease in effective elastic modulus, and a cross-scale correlation between porosity and effective elastic modulus of porous material can be provided. In addition, an example is discussed to illustrate the specific application of this bridging parameter <em>M</em>-integral. The results confirm that <em>M</em>-integral can be an effective parameter bridging mesoscopic porosity and macroscopic damage, and is expected benefit to propose a convenient damage model of porous material. The findings should be of value in investigating the multiscale damage analysis of porous materials.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"142 ","pages":"Article 104337"},"PeriodicalIF":1.9,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a methodology for prediction and calibration of parameters of DEM simulations based on machine learning","authors":"Nasr-Eddine Bouassale,&nbsp;Mohamed Sallaou,&nbsp;Abdelmajid Aittaleb","doi":"10.1016/j.mechrescom.2024.104336","DOIUrl":"10.1016/j.mechrescom.2024.104336","url":null,"abstract":"<div><div>This research work aims to develop a robust methodology for the global estimation of interaction parameters based on machine learning, applicable to the discrete element method (DEM) in the study of granular materials. The specific objectives include establishing a theoretical framework that relates the interaction micro-parameters with the macro-parameters and the physical behaviour of the material; performing DEM simulations for different material parameters; developing a machine learning-based model for global parameter estimation; and consolidating the methodology for obtaining micro-parameters for a given material and behaviour. The methodology will be applied specifically to the case of dry copper ore, evaluating its limitations and the possibility of extension to materials with other characteristics. This approach does not consider direct experimental tests, but focuses on the characterisation of the relationship between the input parameters of the material and its response through simulations, validating the response and sensitivity of the model in its different stages. The methodology is expected to allow the systematic estimation of interaction properties for a DEM model, considering micro-parameter duplicities and their global selection, aspects little addressed in the literature. The final verification includes mechanisms and key questions that facilitate future modifications and improvements, allowing its application to materials of different characteristics beyond the specific case study.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"141 ","pages":"Article 104336"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration response of sandwich plate reinforced by GPLs/GOAM","authors":"Vahid Motalebi,&nbsp;Mehdi Mohammadimehr,&nbsp;Fatemeh Bargozini","doi":"10.1016/j.mechrescom.2024.104334","DOIUrl":"10.1016/j.mechrescom.2024.104334","url":null,"abstract":"<div><div>Due to the improvement in the quality of life for people and the increase in the safety of structures, various industries, especially the transportation and construction industry, need to structures with lower lightweight and higher strength. Increasing the strength of structures with decreasing their weight is the motivation for studying composite sandwich structures reinforced with various types of reinforcements and different porous cores. Researchers' motivation is to try to improve the quality of these structures by integrating multiple materials in sandwich composite structures. This motivation has led to the vibration analysis of a rectangular sandwich plate with a porous core and composite face sheet reinforced by graphene platelets (GPLs) and graphene acoustic origami metamaterial (GOAM). This research hypothesizes that the structure is one fabric, and each layer is completely connected to the next and previous layers. On the other hands, it hypothesizes that the delamination phenomenon for each layer does not occur. Also, the reinforcements are completely uniformly distributed in the face sheet layer. Also, the effects of the shear deformation are considered based on the refined third-order shear deformation theory (RTSDT). There are only four unknown functions compared to other theories, while other shear deformation theories require five functions. In this study, three types of porosity distribution are hypothesized and investigated. It shows that the effect of the second type of porosity distribution on the natural frequency is more significant than the other two types. Also, the effect of a higher (<em>n</em> &gt; 2) power index on the aspect ratio is negligible, while it is noticeable for a lower power index. Moreover, it is seen that by enhancing the weight fraction of GPL/GOAM, frequency increases because of increasing the stiffness of structures.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"141 ","pages":"Article 104334"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ratcheting assessment of additively manufactured SS316 alloys at elevated temperatures within the dynamic strain aging domain","authors":"M. Servatan ,&nbsp;M. Karimi ,&nbsp;S. M. Hashemi ,&nbsp;A. Varvani-Farahani","doi":"10.1016/j.mechrescom.2024.104335","DOIUrl":"10.1016/j.mechrescom.2024.104335","url":null,"abstract":"<div><div>The present study has evaluated the accumulation of plastic strain in additively manufactured (AM) stainless steel 316 samples undergoing asymmetric loading cycles at elevated temperature range where the dynamic strain aging (DSA) phenomenon occurred. The ratcheting response of AM steel samples were assessed through the use of the combined isotropic-kinematic hardening framework. The dynamic strain aging was introduced into the dynamic recovery term of the Ahmadzadeh-Varvani (A-V) kinematic hardening rule by an exponential function ψ(<em>p, T</em>). This function enabled the hardening framework to evaluate the ratcheting of AM steel samples at operating temperatures within the DSA domain. The DSA temperature range for AM SS316 samples fell between 700 K to 1140 K. Within this temperature domain, the interaction between solute atoms and dislocations led to an increase in material strength and suppressed the magnitude of ratcheting over the loading cycles. The influence of DSA on the backstress evolution and the yield surfaces translated in the deviatoric stress space and their subsequent influence on the ratcheting of samples using the A-V model were further discussed. The predicted ratcheting curves at the DSA temperature domain were found in close agreement with those of measured values.</div></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"141 ","pages":"Article 104335"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transformation of surface H-forces in high grade elasticity","authors":"Roberto Fedele","doi":"10.1016/j.mechrescom.2024.104331","DOIUrl":"10.1016/j.mechrescom.2024.104331","url":null,"abstract":"<div><p>The expression of the elastic energy, postulated for a given material, specifies through the principle of virtual work which external loadings turn out to be admissible. For the elastic bodies, the energy of which depends on the gradients of the placement higher than <span><math><mrow><mo>(</mo><mi>H</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow></math></span> (or, equivalently, on the derivatives of the deformation gradient higher than <span><math><mi>H</mi></math></span>), external force densities can be prescribed over the boundary surface, which do work on the <span><math><mi>H</mi></math></span>-th derivative of the virtual displacements along the normal direction. Such generalized forces with <span><math><mrow><mi>H</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn><mspace></mspace></mrow></math></span> have been dealt with in the literature, referred to as <em>double</em> and <em>triple forces</em>: when <span><math><mi>H</mi></math></span> is increased, however, the analytical evaluation of these work terms may become prohibitive. Each Eulerian <span><math><mi>H</mi></math></span>-force density of this kind, acting on the current boundary surface, turns out to be equivalent to a set of diverse actions defined in the Lagrangian configuration. These actions include: (i) surface terms doing work on the virtual displacement vector; (ii) surface terms doing work on the higher order derivatives of the virtual displacement along the normal direction; (iii) edge terms, doing work on the virtual displacement or on its higher order gradients, which may be further reduced. In this study, a recursive algorithm is utilized to generate all these Lagrangian contributions for any <span><math><mi>H</mi></math></span>. Such an approach rests on the binomial expansion of the tensor products of complementary surface projectors, symmetrized in the work duality, and on the integration by parts combined with the generalized divergence theorem.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"141 ","pages":"Article 104331"},"PeriodicalIF":1.9,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0093641324000910/pdfft?md5=b956b1a0e91599b0aca7aa16be779ade&pid=1-s2.0-S0093641324000910-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of circumferential SH-wave interaction with a piezoelectric cylinder having pre-stressed viscoelastic imperfect coating","authors":"Mohammad Arif,&nbsp;Parvez Alam","doi":"10.1016/j.mechrescom.2024.104323","DOIUrl":"10.1016/j.mechrescom.2024.104323","url":null,"abstract":"<div><p>In this study, the circumferential interaction behaviour of the SH-wave with a piezoelectric cylinder coated with a viscoelastic material is investigated. The coating interface is imperfect and the viscoelastic material is subjected to pre-stress. By applying mathematical methods to the dynamical governing equations, expressions for displacement components and electric potential is obtained. Utilizing the set of boundary conditions, dispersion and damping equations are established for this model. The impacts of perfect &amp; imperfect interfaces, piezoelectric &amp; dielectric constants, initial stress, dissipation factor, attenuation coefficient and radial thickness ratio of materials on the phase and damped velocities of SH-wave are observed by numerical examples and graphical visuals.</p></div>","PeriodicalId":49846,"journal":{"name":"Mechanics Research Communications","volume":"141 ","pages":"Article 104323"},"PeriodicalIF":1.9,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142163707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}