Abstract
Probabilistic fracture mechanics is shown in this paper to provide a basis for rational material selection. A study of available statistics of defect sizes and frequency has led to the proposal of a Design Defect Distribution Curve (DDDC) which is probably conservative compared with the actual incidence of defects. The DDDC combined with an approximate analysis of failure probability enables a choice of material properties to be made to satisfy any required risk level. The effect of non-destructive examination is considered. It is shown that the lower cut off level for defect detection can be related to the probabilistic model.
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