Application of New Fatigue Damage Theory in Reliability Design of Automobile Components

A new cumulative fatigue damage theory is established in this paper. Under the premise that the known conditions and the convenience of application are the same as Miner theory, which is the most widely used at present, the new theory successfully solves two basic problems of fatigue: (Measure the load spectrum block of the component in a certain period of working time. ① Calculate the failure probability of the component when it works to the specified time. That is, the failure probability of the component subjected to the specified cycle period of the load spectrum block. ② Calculate the working time of the component under the specified failure probability. That is, the number of cycles of the load spectrum block that the component can bear under the specified failure probability). The new theory has been applied to the fatigue life prediction of various automobile load bearing components, and satisfactory results have been obtained.