Crack Closure, Crack Growth Rate And Fatigue Life Changes Due To
Compressive Overloads In Biaxial Fatigue
Author(s)
T. H. Topper and A. Vawani-Farahani
Abstract
Crack closure, crack growth rate and fatigue
life changes due to compressive overloads in
biaxial fatigue
T. H. ~opper' & A. ~arvani-~arahani~
I Department of Civil Engineering, University of Waterloo, Waterloo,
Ontario, Canada
2 Department of Mechanical, Aerospace and Industrial Engineering,
Ryerson University, Toronto Ontario, Canada
Abstract
Crack opening stresses, crack shape, crack surface asperity heights, crack growth
rates and fatigue lives were obtained at four strain ratios in a SAE 1045 steel.
Measurements for uniaxial tests were made with an optical microscope while
those for other strain ratios were made with a confocal scanning laser
microscope. Two load histories were used, constant amplitude fully reversed
straining and blocks of cycles consisting of one compressive overload cycle and
a number of constant amplitude cycles. Tests were performed on standard ASTM
axial specimens in uniaxial fatigue and on thin walled tubular specimens for
other strain ratios. The machine used for
Keywords
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