| dc.description.abstract | This thesis mainly regards as the theoretical foundation with SSI. Strength degradation in view of composite, the supposition original strength distribution and the stress distribution are a normal distribution, and the dynamic equation of strength degradation is Monte Carlo to simulate the actual use in the situation, the residual strength the phenomenon which degradation along with the time. Again further analyze Weibull Model and Eta Model by fitting. Describes its behavior and discusses reliability degradation and the composite the residual strength distributed change.
Then according to the theory that the stress applied of the first stage, derive the dynamic equation of strength degradation at second stage, consider regarding as the stress adjustment the exchange point with the reliability and doing Monte Carlo to simulate, can find the exchange points of two stages will be different to some extent because it is different to applied the order in the stress. Transformed the low stress by the high stress, appear section of approximate free failure time period the phenomenon, And this section increases greatly because of the height stress’s disparity, derive out this section according to this phenomenon, and compare their accuracy in order to simulated results. If further come to do the discussion, only discuss the range of 1>R>0.99, can regard this period as warranty period.
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