Determination of statistical secured residual lifetime based on sensitivity analysis and stochastic crack propagation simulation
To consider uncertainties due to the scattering of input parameters common residual lifetime calculations are deduced from conservative deterministic crack propagation simulations.Conclusions about the reliability of the residual lifetime are not possible in general.Those can be obtained from stochastic crack propagation simulations.Therefore the significant input parameters have to be identified and statistically modelled.In the present investigations quantil curves of the crack propagation data of 42CrMo4 are derived.From those the fracture mechanical material parameters were statistically modelled.After identifying the significant material parameters by performing a sensitivity analysis stochastic input vectors of the relevant input parameters are generated.Using the Monte Carlo simulation and the analytical crack propagation software NASGRO stochastic residual lifetime calculations are performed and statistically analyzed.Afterwards residual lifetimes can be related to survival probabilities.
residual lifetime calculation sensitivity analysis Monte Carlo method Forman/Mettu-equation
Jens Lebahn Manuela Sander
Institute of Structural Mechanics,University of Rostock,Rostock 18059,Germany
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）