Failure Analysis Based on Weakest Link Concepts

This Chapter begins with the study of statistical effects in failure analysis of springs. The procedure for dimensional analysis of helical spring failures is presented. The dimensional analysis spring element is examined using the weakest link concept. This concept is applicable to the extremely brittle material in which the failure of one link causes the complete destruction of the entire structural element. The stress variation over the wire surface is considered for the analytical calculation of Weibull failure probability. Chapter provides analytical formulas for failure probability of helical springs. The derived solution clarifies the effects of spring index and wire diameter on fatigue life. The methodology is valid for different types of springs or basic structural elements. This Chapter is the third section of the third part, which studies the life cycle of elastic elements.