Time variant reliability analysis under random loads

Conventional reliability models seldom consider the times of load action. The reliability calculated by these models is actually the reliability when random load acts for specified times. For general components and systems, these models can´t reflect the effect of times of load action on reliability explicitly. In this paper different types of load models and the methodology for solving the time invariant and time variant reliability problems has been discussed. These models have been developed using probability differential equations. The relationship between reliability and time is discussed in this paper. The time varying reliability model of components without strength degradation, and that with strength degradation is also discussed.