University of Illinois Urbana-Champaign

Potential flow model of cavitation-induced interfacial fracture in a confined ductile layer

Zhang, Sulin; Hsia, K. Jimmy; Perlstein, Arne J.

Permalink

https://hdl.handle.net/2142/112668

Description

Title
Potential flow model of cavitation-induced interfacial fracture in a confined ductile layer
Author(s)
  • Zhang, Sulin
  • Hsia, K. Jimmy
  • Perlstein, Arne J.
Issue Date
2000-11
Keyword(s)
  • Cavity Growth
  • Fracture Toughness
  • Ideally Plastic Material
Abstract
Fracture of a thin ductile layer sandwiched hetween stiff substrates often results from grow th and coalescence of microscopic cdv1ties ahead of an extending crack. Cavitation induced by plastic flow in a confined, ductile layer is analyzed here to evaluate the interfacial fracture toughness of such sandwich structures. For rigid-plastic materials, a new method is proposed in which the potential flow field of a fluid is used to approximate the plastic deformation. The principle of virtual work rate is applied to determine the equivalent traction-separation law. The method is demonstrated and validated for spherically symmetric cavity growth, for which an exact solution exists. We then study in detail growth of an initially spherical cavity in a cylindrical bar of finite length subject to uniform traction at its ends. The results show that the stress-separation curves depend strongly on initial cavity size and the strain-hardening exponent, and weakly on the ratio of yield strength to Young's modulus. The method has clear advantages when dealing with large plastic deformation and post-instability behavior.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 960
  • 2000-6035
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112668
Sponsor(s)/Grant Number(s)
US Department of Energy
Copyright and License Information
Copyright 2000 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.