Component failure model dependent on time and causes

Abstract

This paper presents a failure model in which the failure rate is a function of cause, of severity of cause acting duration, and of failure mode. This model was constructed in order to treat the effects of an extreme environmental condition and the common mode failure on system reliability. Causes were classified into two types and failure modes in three types. The expressions of failure probabilities were obtained for combinations of these cause and failure mode types. This model was compared with failure data. The time dependence was well expressed by the αth power of time. The values of α were obtained in the range from 0 to 8.