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Abstract:
The conventional method
of fatigue prediction under random loading traditionsily involves two
data processes of cycle counting and damage summation. This paper
introduces an effective fatigue life prediction method for the welded
structures under random loading. According to the method, the fatigue
fife prediction for welded structures under random loading can be made
directly only from a knowledge of the Power Spectral Density (PSD) of
the stress history and conventional fatigue data. Even though the
designer of structures does not know the stress-time history at the
design stage, but with the exact inputs of the structures, the fatigue
life prediction for the designed structures can still be made since the
PSD of structures response function of the structural system. The method
described in the paper is applied to an extraheavy mining truck frame.
The enlaslated fatigue life is basically the same as that with the
practice.
Key words:
Welded
structure Fatigue life Power spectral density Truck
frame
国家重大技术装备科技攻关项目. Received 19910903,
received in revised form 19920228
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