Abstract:

This paper takes example for evaluating the life of the improved undercarriage beam which is a main fatigue component in a kind of plane, and describes the method about evaluating the fatigue life of the improved components in the case of lack of whole size testing. This method bases on the detail stress analysis of the main fatigue parts between the improved component and the unimproved component, and evaluates synthetically the coefficient of life increase of the improved component by analyzing the life of the simulator specimen of this component by analyzing the life of the simulator specimen of this component in the case of each load spectrum and the fatigue compare testing, and ascertains the fatigue life of this improved main component by consulting the result of the whole size testing about this unimproved component.  The life evaluating of the undercarriage beam which is a main fatigue component in a kind of plane is completed by this method.  The result was applied to this kind of plane.

Key words: ompare , testing,  , life , evaluating,  , simulator , specimen,  , crack , propagation,  , undercarriage , beam