fabrication of ultrafine grained materials by imposing severe plastic deformation for improvement of mechanical and physical properties of metals has been the focus of many researches over the past few years. in this process, a sheet is subjected to repetitive shear deformation conditions by utilizing asymmetrically grooved and flat dies through alternate pressing. in this study, a 2mm thick co...

Based on Rayleigh beam theory, the sub-impacts of a free-free beam struck horizontally by a round-nosed rigid mass is simulated by the finite difference method and the impact-separation conditions. In order to obtain the sub-impact force, a uniaxial compression elastic-plastic contact model is employed to analyze the local deformation field on contact zone. It is found that the horizontal impac...

Shear deformation of fault gouge or other particulate materials often results in observed strain localization, or more precisely, the localization of measured deformation gradients. In conventional elastic materials the strain localization cannot take place therefore this phenomenon is attributed to special types of non-elastic constitutive behaviour. For particulate materials however the Cosse...

As the springback of sheet metal during unloadingmay cause deviation from a desired shape, accurately predicting springback is essential for the design of sheet stamping operations. Finite-element models have not been successful in predicting springback; hence there is a need for analytical models to make such predictions. In this study, a model based on differential strains after relief from t...

Constitutive relations for two-dimensional deformations of cohesionless granular materials are considered. The granular materials are assumed to be isotropic and rate-independent. One of the current trends in modelling the behaviour of granular materials is to study constitutive relations of the hypo-elastic The general hypo-elastic constitutive relation, originally proposed by Tr~esdell ,~ is ...

We present a methodology of accurately reconstructing the deformation and surface characteristics of a scanned 3D model recorded in real-time within a Finite Element Model (FEM) simulation. Based on a sequence of generated surface deformations defining a reference animation, we illustrate the ability to accurately replicate the deformation behavior of an object composed of an unknown homogeneou...

In this paper, a research study is presented focusing on the effect of substituting brittle concrete in conventional reinforced concrete column members with a ductile engineered cementitious composite (ECC). Based on the material properties of ECC, the interaction with structural reinforcement is characterized by compatible deformations of the reinforcement and ECC matrix in the elastic and ine...

For noncentrosymmetric crystals, internal lattice relaxation must be considered for theoretical predictions of elastic properties. This paper develops a molecular dynamics approach for determination of the internal relaxation displacement in a single-layer graphene sheet under macroscopically homogeneous in-plane deformation. Based on an analytical interatomic potential, a generally nonlinear r...

Abstract The Swift cup drawing test has been adopted for evaluating sheet metal deformation properties, namely the material formability assessed through limiting ratio. Since strain path of points located on flange is between uniaxial compression and pure shear, this region subjected to thickening. If thickness drawn larger than gap punch die, wall ironing will occur. Therefore, forces can lead...

Collagen is the most important structural protein in biology and is responsible for the strength and integrity of tissues such as bone, teeth, cartilage and tendon. Here we report a systematic computational sequencing of the effect of amino acid motif variations on the mechanical properties of single tropocollagen molecules, with a particular focus on elastic deformation at varying applied stra...