Abstract
Fatigue process of bovine compact bone was investigated to clarify the effects of bone tissue on crack initiation and growth behavior during the fatigue process. Then, computer simulation of the fatigue process was performed. The main results were summarized as follows. (1) Fatigue cracks initiated mainly from havers, lacunae and volkmann in bone. (2) Crack growth rate decreased when the crack tip reached bone tissues such as havers, lacunae and volkmann due to blunting of the crack tip. When the crack tip reached the interface between the bone matrix and cement lines, crack growth direction was deflected to the direction of the cement line. (3) Computer simulation of the fatigue process of bone was conducted, in which the above-mentioned interactions between bonetissues and crack initiation and growth behavior were considered. The results coincided well with the experimental results, and showed a strong effect of bone density on the crack growth life.
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