Q1. A compact tension specimen of a steel with width W=200mm,a=90mm and B=80mm was tested according to the ASTM E399 procedure. The material of the specimt n has a yield stress of 0.9GPa. If the secant load PQ was measured as 300kN, calculate the conditional KIC in MPam and test its validity for specimen dimensions a,h,W and B, given that KQ=BWPQf(), where =Wa and f()=(1)1.52+[0.886+4.6413.322+14.7235.64] [10]