Abstract
Today for much expensive and complex mechanical system the stringent reliability requirements are one of the major equipment developmental factors.
The frequently used concept of predicting mechanical component reliability is by applying the interference theory. This theory is based the fact that when the strength of a material, a component or device is less than the imposed stress on it, the failure occurs.
The strength is defined as the ability of the component, a device or a material to accomplish its required mission satisfactorily without a failure when subject to the external loading and environment
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