Numerical simulation of effects of cladding and superimposed hydrostatic pressure on fracture in metals under tension.

Abstract

<p>In this study, detailed numerical works are carried out to investigate cladding<br />and superimposed hydrostatic pressure on fracture in metals under tension by using<br />finite element software ABAQUS/Explicit. It is concluded that both cladding and<br />superimposed hydrostatic pressure delay void nucleation and void growth, which<br />results in increasing fracture strain in metals under tension.<br />The influence of cladding on delaying fracture in metals under tension is<br />numerically studied by employing Gurson-Tvergaard-Needleman (GTN) damage<br />model. It is found that cladding has a significant effect on enhancement in materials'<br />ductility due to the fact that cladding increases necking strain which in tum delays the<br />void nucleation and growth. Topological arrangement of cladding in axisymmetric<br />tensile round bars shows no noticeable effect on necking but significantly affects<br />fracture strain.<br />The influence of superimposed hydrostatic pressure is numerically<br />investigated on sheet metals under plane strain tension by using GTN damage model.<br />It is found that superimposed hydrostatic pressure has no noticeable effect on necking<br />but significantly delays fracture initiation due to the fact that superimposed<br />hydrostatic pressure delays or completely eliminates the nucleation, growth and<br />coalescence of microvoids or microcracks.</p>