Experimental and numerical evaluation of geometric variation of critical SZW in 20MnMoNi55 steel

Abstract

In the present investigation variation of SZWc due to thickness, relative crack size and geometry has been explored in 20MnMoNi55 material using both experimental and numerical techniques. The results showed dependency of critical SZW on thickness and its independency on relative crack size. The critical SZW determined using SE(B) fracture specimen is 17-18% lower than C(T) and A(T) specimens. The numerical critical SZW methodology predicted the experimental results well. Importance of integral average stress measure parameter while defining minimum thickness criteria is also shown in the results.