Then, on the basis of the expression for notch strength of brittle material and the fundamental principle of probability theory, correlations between the statistical characteristic parameters o.

Compared with the forging die steel, casting forging die steel although toughness is low, but high strength, red hardness is good, with low notch sensitivity and high resistance to thermal fatigue.

The effects of testing temperature on notch impact strength, fractographic features and fracture surface roughness of PVC have been studied.