Numerical Integration Calculation Method of Cumulative Fatigue Damage
Calculation method of cumulative fatigue damage by numerical integration with Gauss-Legendre formula was present-ed,of this method,cumulative fatigue damage is calculated by numerical integration to non-integrable function including prob-ability density function of equivalent load.Took two kinds of material 16Mn and 60Si2Mn as study object,based on two common distribution forms of equivalent load Gauss distribution and Weibull distribution,the calculation method was verified by experi-mental design,the result of verification showed that,the Calculation method of cumulative fatigue damage is correct and effec-tive by numerical integration with Gauss-Legendre formula;Comparative analysis was performed to traditional 8-level load method,the analysis result showed that,under the action of continuous or approximate continuous load spectrum,cumulative fa-tigue damage calculated with 8-level load method would cause more and unstable deviation rate,Gauss numerical integration method is a Calculation method of cumulative fatigue damage superior to 8-level load method,it can improve calculation accu-racy of cumulative fatigue damage greatly.
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