A time-variant reliability approach for mechanical structures for non-linear behaviour

Assessing efficiently the lifetime of aging mechanical components structures needs taking into account the random and temporal character of material properties, environmental conditions and loads. Time-variant reliability methods are a way to deal with this source of concern. Combined with the theory of reliability design and the method durability, computation method of time-dependent reliability of mechanical components is set based on models of time-dependent reliability. A realistic prediction of the durability of industrial-type structures also requires considering non-linear material behavior induced by plasticity, damage, etc. Therefore this paper has presented the PHI2 method for solving time-variant reliability problems and is illustrated on the example of a side beam submitted to a random load.