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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1232-1235

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1232 - 1235 Next article>>

Inclined Fatigue Crack Growth Mechanism from Notch

Chiaki IHARA1) and Takeyuki TANAKA2)
1) Prof. Emeritus of Kyoto Univ.
2) Center for arts and sciences, Fukui Prefectural Univ.

Recently the relation between the fatigue crack propagation and slip behavior around the crack tip has been researched by means of an Atomic Force Microscope (AFM). In the previous paper, we explained Mode I fatigue crack propagation using a stochastic damage accumulation model for crack propagation based the observation results by AFM. In this paper, the inclined fatigue crack growth process from the notch is analyzed by the use of the method introduced in above model. As the result, the following were found. (1) The inclined crack grows in mixed mode of Mode I and II by continued destruction owing to the equal release rate g. (2) When the crack changes its direction, it continues to propagate in mode I, because ΔKeff in mode I obtained from above g is beyond ΔKeff th.

Inclined fatigue crack, Mixed mode of Mode I and II crack growth, Mode I fatigue crack propagation, AFM image

Received: December 20, 2007
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan



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