Instability of dilutely voided material in uniaxial tension

✍ Scribed by Stefan Jansson; Ulf Stigh

• Book ID: 103068967
• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 639 KB
• Volume: 25
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(86)90027-5

✦ Synopsis

A continuum mechanical study is made of the deformation and damaging of a bar in u&axial tension. Attention is paid to instability as caused by loss of equilibrium. The material is assumed to deform due to creep and tim~independent plasticity. The damage is modelled with spherical voids, which are assumed to nucleate at a rate proportional to the strain rate. The voids are assumed to undergo self-similar expansion. The damage parameter o is defined through the Rabotnov creep law, B = S[u/(l -o)]", where C is determined by continuum mechanical analysis of the voided material. A damage growth law is derived. It is then used to investigate the influence of initial damage, hardening exponent and nucleation rate on the critical stress and strain.