In this paper, we have developed a linear stability analysis to predict the formation of necking instabilities in porous ductile plates subjected dynamic biaxial stretching. The mechanical behavior material is described with Gurson–Tvergaard–Needleman constitutive relation for progressively cavitating solids (Gurson 1977; Tvergaard 1981, 1982; and Needleman 1984) which considers voids be spheri...

A welded rectangular hollow section (RHS) X-joint exposed to tension loading has three typical fracture-related failure modes: Punching shear (PSF), Brace (BF), and Chord side wall (CSWF). Prediction of these modes by finite element (FE) simulations requires modelling the material damage. An appropriate damage model accurately predicts behaviour fracture zone provides necessary information impr...

Abstract The objective of this work is to investigate the plastic deformation and associated microstructural evolution damage in a martensitic steel at multiple length scales, using combination finite-element (FE) modelling experimental measurements. A multiscale model developed predict necked region uniaxial tensile test specimen. At macroscale, von Mises plasticity FE conjunction with Gurson-...

Ductile failure prediction is essential to avoid loss of structural integrity or control crack propagation during forming processes. One the main difficulties complex paths. This study proposes a nonlocal extension local Gurson–Tvergaard–Needleman (GTN) ductile damage model at finite strains able capture cup–cone slant fracture. The proposed based on an implicit gradient formulation which enabl...

Mechanical properties of alloys have a strong relation with microstructure and determination of their behavior can lead to multiple advantages. To obtain this goal, finite element method )FEM( is one of the best ways. In this study a series of experiments were carried out on the produced Ti-6Al-4V to obtain its mechanical characteristics and to prepare it for photographing in micro dimensions. ...

It has been shown that the plastic response of many materials, including some metallic alloys, depends on the stress state. In this paper, we describe a plasticity model for isotropic materials, which is a function of the hydrostatic stress as well as the second and third invariants of the stress deviator, and present its finite element implementation, including integration of the constitutive ...

The present work addresses the micromechanical modeling and simulation of crack initiation propagation in ductile materials failing by void nucleation, growth coalescence. A cohesive–volumetric approach is used overall material behavior characterized both a hardening bulk constitutive law softening surface traction–separation embedded between each mesh finite element discretization. sums up acr...

The use of high strength steel (HSS) cold-formed hollow section is significant interest in the construction sector due to competitive costs. accurate simulation ductile fracture failure at micro and macro scale critical for improving validity predicting structural behaviour HSS sections welded joints. In this study, S700 material studied using Gurson-Tvergaard-Needleman (GTN) damage model. Repr...