Study of crack propagation behavior during low cycle fatigue in spheroidal graphite cast iron based on observation of surface and fracture sections |
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| Authors: | F Nishimura K Morino H Nisitani |
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| Affiliation: | (1) Department of Mechanical and Electrical Engineering, Tokuyama College of Technology, 3538 Takajo, 745-8585 Kume, Tokuyama, Yamaguchi, Japan;(2) Department of Mechanical Engineering, Kyushu Sangyo University, 2-3-1 Matsukadai, 813-8503 Higashi-ku, Fukuoka, Japan |
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| Abstract: | In this paper, in order to clarify the effect of crack coalescence for crack growth rate, low cycle fatigue tests were carried
out using two kinds of spheroidal graphite cast iron (SGI). Crack propagation behavior from crack initiation to fracture was
investigated by observing the surface of specimens and their fracture section. The main results obtained are as follows: (1)
The variation range in the crack growth curves in SGI is larger than that in its matrix material. This tendency is caused
by the occurrence of crack coalescence and the difference in crack initiation length. (2) In most of the cases where the crack
growth rate accelerated, there was microshrinkage on the neighboring surface. (3) Crack coalescence is not the main factor
in accelerating crack growth rate. |
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| Keywords: | fatigue low cycle fatigue spheroidal graphite cast iron crack propagation crack coalescence microshrinkage SEM |
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