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ΔK-Dependency of Fatigue Growth of Single and Mixed Mode Cracks Under Biaxial Stress
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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.
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Title: ΔK-Dependency of Fatigue Growth of Single and Mixed Mode Cracks Under Biaxial Stress
Description:
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.
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