Probabilistic Life Assessment Of An Impeller With Discontinuities.
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This paper discusses and presents a probalistic method to evaluate the useful life of an impeller with material imperfections. These discontinuities may be on the surface or subsurface. The method combines linear elastic fracture mechanics (LEFM) techniques with Monte Carlo simulation. Siddall (1983) provides a description of Monte Carlo technique in his book on probalistic engineering design. An example is included in this paper to demonstrate the use of fracture mechanics and Monte Carlo techniques in estimating the reliability of an impeller. It will show the information required, and will present typical results that will include stress contour plots, assumptions made relating the defects to a range of initial defect sizes, and plots of the probability of reaching a final critical defect size. A similar concept has been employed to assess reliability for various turbomachinery components (Singh, 1991; Jatla, 1990; Thacker, et al., 1990; Newell, et al., 1990; and Tipton, 1991).
Singh, Murari P.; Sullivan, William E.; Donald, George; Hudson, Jim (2004). Probabilistic Life Assessment Of An Impeller With Discontinuities.. Texas A&M University. Turbomachinery Laboratories. Available electronically from