X線フラクトグラフィを用いたコネクティングロッド疲労破面の解析

抄録

Stress analysis by using fractography is already established technology as means for seeking cause of fracture and has been widely employed. In actually broken machine parts, however, sufficient analytical results may not always be obtained by the technique of fractography due to oxidation, stain or damage of the fracture surface. On the other hand, the fracture analysis method applying the X-ray diffraction method, that is, the X-ray fractography comes to be used as effective fracture surface analysis. In the X-ray diffraction method, the change in the values related to plastic deformation and residual stress near the fracture surface may be determined, and information of internal structure of material can be obtained.
In the present study, based on the information from the fracture surface obtained by fatigue test, the correlation of X-ray parameter and fracture mechanics parameter was determined, and application to actual broken machine parts was studied.