Paper Title:
Effect of Constraint on the Initiation of Ductile Fracture in Shear Loading
  Abstract

Research studies for mode I cracks have shown that fracture toughness or the critical value of J for fracture initiation, Jcrit is not merely a material property but depends also on the geometry and loading configurations. The geometry dependency of fracture toughness can be attributed to the effect of the crack tip constraint. In this paper, the constraint effect is studies for the initiation stage in mode II ductile crack growth. Two major mechanisms of ductile fracture: 'void growth and coalescence' and 'shear band localization and de-cohesion' are considered. A boundary layer model is simulated using the finite element method and the effect of far-filed T-stress on the relevant stress parameters near the crack tip is studied. It is shown that the initiation of the ductile crack growth in mode II is influenced significantly by T for the mechanism of void growth and coalescence and is insensitive to T for the mechanism of shear localisation and de-cohesion.

  Info
Periodical
Key Engineering Materials (Volumes 261-263)
Edited by
Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka
Pages
183-188
DOI
10.4028/www.scientific.net/KEM.261-263.183
Citation
M. R. Ayatollahi, D. J. Smith, M.J. Pavier, "Effect of Constraint on the Initiation of Ductile Fracture in Shear Loading", Key Engineering Materials, Vols. 261-263, pp. 183-188, 2004
Online since
April 2004
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Price
$32.00
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