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Methods for an estimation of thershold values for fatique crack propagation through a bi-material interface

Nahlik L.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

2003

nr 21

179-184

elastic materials under assumptions of linear-elastic fracture mechanics. Two procedures for the estimation of threshold values for further crack propagation from bi-material interface to the second material are suggested. One of the is related to the area of the plastic zone in front of the crack tip, while the second one is based on the Sih's strain energy density concept. Special attention is devoted to a crack perpendicularly oriented to the bi-material interface. It is shown that the corresponding fatigue threshold value is strongly influenced by the existence of an interface between the two materials. Both methods are used to quantify the threshold values of the fatigue crack propagation and simultaneously compare the relative accuracy of both approaches. On the basis of the obtained results, it seems promising to use any approach in the decision on whether the crack will stop at the interface or will continue growing into the second material.