Analysis Of The Effect Of Kmax On The Fatigue Crack Propagation Threshold
Author(s)
J. Zhang, J. Z. Zhang & S. Y. Du
Abstract
Analysis of the effect of Kmax on the fatigue
crack propagation threshold
J. zhangl, J. Z. zhang2 & S. Y. D U ~
arbin in University of Science and Technology, Harbin, China
2~chool of Aerospace Engineering and Mechanics,
Harbin Institute of Technology, Harbin, China
3 Composite Research Centre, Harbin Institute of Technology, Harbin,
China
Abstract
In-situ SEM observations have revealed that fatigue crack propagation is caused
by the shear band decohesion around the crack tip and the formation and
cracking of the shear band is mainly caused by the plasticity generated in the
loading part of a load cycle. Based on the crack tip plasticity a theoretical
analysis has been performed and a model has been set up to consider the effect of
the applied stress ratio on the fatigue crack propagation threshold. The obtained
results have been compared with published test data and a good agreement has
been achieved. This method is very easy to use and no fatigue crack closure
measurement is needed, therefo
Keywords
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