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Effect of damage on fatigue crack propagation in polystyrene

✍ Scribed by A. Chudnovsky; W.-L. Huang; B. Kunin

Publisher: Society for Plastic Engineers
Year: 1990
Tongue: English
Weight: 637 KB
Volume: 30
Category: Article
ISSN: 0032-3888
DOI: 10.1002/pen.760302007

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

In this paper we examine a conventional approach to correlate the fatigue crack growth rate with fracture mechanics parameters such as stress intensity factor or elastic energy release rate. To simulate a complex loading history we grow a fatigue crack in a vicinity of a hole in a single edge notched specimen under tension‐tension. It is found that the correlation between the crack speed and stress intensity factor, etc. may exist only for limited experimental conditions. In general, fatigue crack growth is inseparable from the evolution of the damage zone preceding the crack, and damage evolution parameters should enter constitutive equations of fatigue crack growth. The essential role of the damage zone in determining the crack trajectory and speed is demonstrated.

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