A framework for development of constitutive models based on semi-micromechanical aspects of plasticity is proposed. The resulting of this model for material employed friction type failure criterion, sub-loading surface, and associated flow rule. This model is capable of predicting effects of the rotation of principal stress/strain axes and consequent plastic flow, induced anisotropy of strength...

Void nucleation, growth, and coalescence at extreme strain rates in ductile metals with weak mechanical anisotropies, e.g., copper, iron, aluminum, have been extensively investigated. However, the atomic-scale fracture properties of strongly anisotropic metals, especially hexagonal close-packed (HCP) ultrahigh rarely studied. We investigated voids HCP-Zr under isotropic-triaxial tension using m...

Heterogeneous energetic materials (EMs) contain microstructural defects such as voids, cracks, interfaces, and delaminated zones. Under shock loading, these offer potential sites for energy localization, i.e., hotspot formation. In a porous EM, the collapse of one void can generate propagating blast waves hotspots that influence phenomena at neighboring voids. Such void–void interactions must b...

Quantitative behaviors of shock-induced dislocation nucleation are investigated by means of molecular dynamics simulations on fcc Lennard-Jones solids: a model argon. In perfect crystals, it is found that the Hugoniot elastic limit (HEL) is a linearly decreasing function of temperature: from near-zero to melting temperatures. In a defective crystal with a void, dislocations are found to nucleat...

The goal of this paper is to study the impact a differential mass loss or lack material (void) directly located into core structure matter together with possibility measuring its effect by resonant signal surface at optical frequencies. To end, focus has been on evolution effective indices eigenvalues micro-resonators as relevant models. Specific was measured way principle. Then, specific famil...

the conditional formal potential, e°′of methyldopa has been studied by cyclic voltammetry at the surface of activated glassy carbon electrode (agce) as the working electrode in different ph phosphate buffered solutions. the experimental standard redox potential, e°′, of methyldopa is obtained to be 0.72 mv versus she (standard hydrogen electrode). e°′ values have also been calculated with the a...

In this paper, a void closure model applicable to the general hot forming process has been proposed. Through representative volume element (RVE) method, influences of shape, orientation, and stress state on tendency were analysed. The was established so that it could consider these cross effects. calculates changing radius orientation during deformation by considering rate change parameters aff...

Spherical void expansion in plastics and rubber-modified plastics is investigated under radial traction conditions. The plastics are modeled as elastic-plastic pressure-sensitive materials and the rubbers are modeled as nonlinearly elastic materials. First, the growth of a spherical void in an infinite plastic matrix is investigated under remote radial traction conditions. The results show that...

class AbstractList { //@ model public int size; //@ in isEmpty; //@ model public boolean isEmpty; //@ public represents isEmpty <(size == 0); //@ public invariant size >= 0; //@ assignable isEmpty; //@ ensures isEmpty; abstract public void clear(); //@ assignable size; // but isEmpty is not assignable //@ ensures size <= \old(size); //@ ensures \old(size) > 0 ==> size > 0; abstract public void ...

Numerical modeling was carried out to investigate the responses of suction bucket foundations under vertical cyclic loading. Numerical results were compared with centrifuge experiment results. Before the capacity of the model suction bucket to resist cyclic loading could be investigated, the static pullout capacities had to be determined. The buckets with different aspect ratio are investigated...