Journal Published Online: 01 November 1998
Volume 26, Issue 6

Effect of Loading Parameters on Post-Overload Fatigue Crack Closure



The tensile overload cycle has a significant effect on fatigue behavior, resulting in an enhanced crack closure level and reduced fatigue crack growth rate. The present investigation studies the effect of opening mode tensile overload on crack closure in 2024-T3 aluminum alloy and 4130 Cr-Mo steel sheets. It is found that the overload-induced closure parameter KopOLincreases with basic stress intensity range ΔK and overload level. The result further indicates that the significant closure effect can be obtained only beyond a limiting level of overloading ratio (OLR)=1.30 in both the alloys, where OLR is the ratio of the maximum stress-intensity factor in the overloading cycle to the maximum stress-intensity factor in the constant-amplitude loading cycle.

Author Information

Verma, BB
R. E. College, India
Pandey, RK
I.I.T. Delhi, New Delhi, India
Chinnadurai, R
Technical Centre, Civil Aviation Department, New Delhi, India
Pages: 7
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Stock #: JTE12159J
ISSN: 0090-3973
DOI: 10.1520/JTE12159J