Archives of Mechanics最新文献_第6页

Selection of slip systems in confined single crystal gradient plasticity: coupled effects of slip system orientations, latent hardening, and grain boundaries 受限单晶梯度塑性中滑移系统的选择：滑移系统取向、潜在硬化和晶界的耦合效应

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-06-28 DOI: 10.24423/AOM.3079

J. Dequiedt

{"title":"Selection of slip systems in confined single crystal gradient plasticity: coupled effects of slip system orientations, latent hardening, and grain boundaries","authors":"J. Dequiedt","doi":"10.24423/AOM.3079","DOIUrl":"https://doi.org/10.24423/AOM.3079","url":null,"abstract":"In crystal plasticity under prescribed deformation, the incremental material response is potentially non-unique owing to slip system redundancy for most of the crystalline structures. Following Petryk, energy minimizing considerations give the way to select one of these solutions and the set of active systems, which depend on their more or less favorable orientation and their mutual interactions (latent hardening). This variational approach is extended here to confined plasticity in a finite volume, simulating a single crystal embedded in an aggregate. A slip gradient enhanced framework and related micro-hard boundary conditions are considered, using two defect energies introduced by Gurtin and coworkers: the first one takes the slip system polar dislocation densities as internal state variables and the second one is a quadratic potential of the dislocation density tensor. In both cases, micro-hard conditions amount to null flow for the two former quantities. For the classical one dimensional case of a strip in simple shear, the two models yield substantially different solutions, the second one coupling the gradients on the different systems. These results emphasize the necessity for a physically motivated modeling of gradient effects in the vicinity of grain boundary interfaces.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42013011","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}

引用次数: 3

Experimental determination and numerical simulation of material and damage behaviour of 3D printed polyamide 12 under quasi-static loading 准静态载荷下3D打印聚酰胺12材料与损伤行为的实验测定与数值模拟

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-06-08 DOI: 10.24423/AOM.3162

D. Schob, R. Roszak, I. Sagradov, H. Sparr, M. Ziegenhorn, A. Kupsch, Fabien Leonard, B. Müller, G. Bruno

{"title":"Experimental determination and numerical simulation of material and damage behaviour of 3D printed polyamide 12 under quasi-static loading","authors":"D. Schob, R. Roszak, I. Sagradov, H. Sparr, M. Ziegenhorn, A. Kupsch, Fabien Leonard, B. Müller, G. Bruno","doi":"10.24423/AOM.3162","DOIUrl":"https://doi.org/10.24423/AOM.3162","url":null,"abstract":"In order to characterise the material and damage behaviour of additively manufactured polyamide 12 (PA12) under quasi-static load and to implement it in a numerical model, experiments under quasi-static load as well as microstructural investigations were carried out. Selective laser sintering (SLS) was used as the manufacturing process. For the classification of the material behaviour, quasi-static cyclic tests with holding times as well as tensile tests were performed. X-ray refraction and computed tomography (CT) were used to investigate the damage behaviour. The Chaboche model, which has already been applied for metallic materials under thermomechanical loading, served as the basis for the selection of the numerical material model. The same procedure was used for the selection of the damage model, where the Gurson–Tvergaard–Needleman (GTN) model was chosen, which was already used for porous metallic materials. The Chaboche model shows very good agreement with experimental results. Furthermore, the coupling with the GTN model allows a very good modelling of the damage behaviour. Finally, it could be shown that the selected models are suitable to simulate the material and damage behaviour of 3D printed PA12.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68939086","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}

引用次数: 10

Shock compressibility and spall strength of textolite depending on fiber orientation 纤维取向对纺织石的冲击压缩性能和剥落强度的影响

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-05-28 DOI: 10.24423/AOM.3144

V. Mochalova, A. Utkin, V. Rykova, M. Endres, D. Hoffmann

引用次数: 2

Second-order two-temperature model of heat transfer processes in a thin metal film subjected to an ultrashort laser pulse 超短激光脉冲作用下金属薄膜传热过程的二阶双温度模型

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-05-28 DOI: 10.24423/AOM.3131

E. Majchrzak, J. Dziatkiewicz

{"title":"Second-order two-temperature model of heat transfer processes in a thin metal film subjected to an ultrashort laser pulse","authors":"E. Majchrzak, J. Dziatkiewicz","doi":"10.24423/AOM.3131","DOIUrl":"https://doi.org/10.24423/AOM.3131","url":null,"abstract":"Thermal processes in domain of thin metal film subjected to an ultrashort laser pulse are considered. A mathematical description of the process discussed is based on the system of four equations. Two of them describe the electrons and lattice temperature, while third and fourth equations represent the generalized Fourier law, it means the dependencies between the electrons (lattice) heat flux and the electrons (lattice) temperature gradient. In the generalized Fourier law the heat fluxes are delayed in relation to the temperature gradients which consequently causes the appearance of heat fluxes time derivatives in the appropriate equations. Depending on the order of the generalized Fourier law expansion into the Taylor series, the first- and the second-order model can be obtained. In contrast to the commonly used first-order model, here the second-order two-temperature model is proposed. The problem is solved using the implicit scheme of the finite difference method. The examples of computations are also presented. It turns out that for the low laser intensities the results obtained using the first- and the second-order models are very similar.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44111343","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}

引用次数: 3

Computational method for shaping the vibro-isolation properties of semi-active and active systems 半主动和主动系统隔振特性的计算方法

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-05-21 DOI: 10.24423/AOM.3098

T. Krzyżyński, I. Maciejewski

引用次数: 2

Exact response probability density functions of some uncertain structural systems 某些不确定结构系统的精确响应概率密度函数

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-05-21 DOI: 10.24423/AOM.3109

Giovanni Falsone, R. Laudani

引用次数: 8

Solution of the plane contact problem between a finite-thickness laterally graded solid and a rigid stamp of an arbitrary tip-profile 有限厚度横向渐变固体与任意尖端轮廓刚性印模平面接触问题的求解

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-03-12 DOI: 10.24423/AOM.3207

Onur Arslan

{"title":"Solution of the plane contact problem between a finite-thickness laterally graded solid and a rigid stamp of an arbitrary tip-profile","authors":"Onur Arslan","doi":"10.24423/AOM.3207","DOIUrl":"https://doi.org/10.24423/AOM.3207","url":null,"abstract":"A singular integral equation (SIE) approach and a finite element method are developed for the solution of the frictional sliding contact problem between a finite-thickness laterally graded solid and a rigid stamp of an arbitrary tip-shape considering the plane strain assumption. An exponential shear modulus variation is introduced through the lateral direction. The field variables are obtained applying the Fourier transformation techniques on the governing partial differential equations. A surface displacement gradient is then utilized to derive a SIE of the second kind. A numerical solution of the SIE is performed by using a collation method and the Gauss quadrature integration techniques for the flat, triangular and circular stamp profiles. Finite element analyses (FEA) of the same contact problems are also performed upon selection of the augmented Lagrange contact-solver in ANSYS. For the incomplete (triangular and circular) stamp problems, an iterative algorithm is developed in order to obtain practically computational solutions for any desired contact lengths. Successful convergence of the SIE results and excellent consistency between the SIE and FEA results are attained, that indicate the reliability of both methods. The change in the thickness is shown to alter the contact behavior of the laterally graded solid significantly.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2019-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43054058","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}

引用次数: 3

Reach of an inclined cantilever with a tip load 倾斜悬臂带顶端载荷的范围

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-03-12 DOI: 10.24423/AOM.3254

P. Singh, V. Goss

引用次数: 0

Two imperfectly bonded half-planes with an arbitrary inclusion subject to linear eigenstrains in anti-plane shear 在反平面剪切中，具有任意夹杂的两个非完美结合的半平面受线性特征应变的约束

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-03-12 DOI: 10.24423/AOM.3299

L. Sudak

引用次数: 0

Prediction of secondary flow losses in an entrance duct to a low-pressure turbine 低压涡轮入口管道二次流损失预测

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2019-02-27 DOI: 10.24423/AOM.3025

P. Jonak, T. Borzęcki, S. Kubacki

引用次数: 0