SYMPOSIA PAPER Published: 01 January 1985
STP36223S

Δ -Dependency of Fatigue Growth of Single and Mixed Mode Cracks Under Biaxial Stress

Source

A comprehensive fracture mechanics study has been carried out on the fatigue crack growth under various biaxial stress conditions. Fatigue tests have been conducted on a high-cycle biaxial fatigue test facility and a cruciform flat specimen of a weldable structural steel with a center crack parallel to one load axis or a slant crack.

The effects of biaxial stresses have been investigated on the fatigue crack growth properties ΔKI-da/dN, the threshold conditions ΔKIth, and the crack closure behavior.

If a crack is large and stress level is low, no effect of biaxial stress appears. However significant effects of biaxial stress appear where a crack is small and stress level is high.

The mixed mode cracks were realized by a series of fatigue tests started from a slant crack in a cruciform specimen, where a longer bent crack or a branched crack appeared. It is found that such a nonstraight crack follows along the direction where ΔKII = 0 and the ΔKI-da/dN relations coincide with those for a straight crack under single KI mode.

Author Information

Kitagawa, H
Yokohama National University, Yokohama, Japan
Yuuki, R
Institute of Industrial Science, University of Tokyo, Tokyo, Japan
Tohgo, K
Nagoya University, Nagoya, Japan
Tanabe, M
Toyota Motor Co., Ltd., Toyota, Japan
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Details
Developed by Committee: E08
Pages: 164–183
DOI: 10.1520/STP36223S
ISBN-EB: 978-0-8031-4921-2
ISBN-13: 978-0-8031-0444-0