Crack propagation under constant amplitude loading

A crack propagation law is derived on the concept that net energy released in one cycle in the vicinity of crack tip is absorbed in cyclic plastic zone incorporating the concept of crack closure. Further, the derived law is modified by introducing some more material properties, as an attempt towards generalization. The finally developed law is dimensionally correct. The crack growth rates predicted by the developed crack growth rate law are compared with the experimental data of 16 materials and a good correlation is achieved.