SEDL / STP / STP511-EB / STP35404S

Regression Models for the Effect of Stress Ratio on Fatigue Crack Growth Rate

Mukherjee, B
Postdoctoral fellow and professor of mechanical engineering, University of Waterloo, Ont.

Burns, DJ
Postdoctoral fellow and professor of mechanical engineering, University of Waterloo, Ont.

Pages: 18    Published: Jan 1972

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Abstract

Regression models, based on linear elastic fracture mechanics, are used to interpret the effect of stress ratio on fatigue crack growth rate in 7075-T6 aluminum alloy. It is shown that fatigue crack growth rate can be related to range and maximum values of stress-intensity factor. Statistical techniques are used to examine the error which may accumulate when regression equations are used to predict crack growth versus cycles curves.