A Probabilistic Approach in Virtual CAE Fatigue Life Prediction for Components of Exhaust System

Paper #:
  • 2018-01-1397

Published:
  • 2018-04-03
Abstract:
Bushing such as converter inlet and outlet, muffler inlet and outlet is one of most important components of exhaust system. Durability performance of bushing fatigue impacts durability of exhaust system directly. One effective method to predict bushing fatigue life accurately is very critical to optimize bushing design, and to reduce bushing fatigue life validation cycle and cost. It is well known that fatigue is not deterministic phenomenon but statistical phenomenon. Prediction of reliability of bushing fatigue life makes more sense for bushing fatigue life validation and verification. In this study, different methods such as traditional stress analysis method and Verity method are used to predict busing fatigue life. Both parent material and weld failures are considered. Prediction results by different method are compared to correlate test results. Weibull distribution is used to calculate reliability of bushing fatigue life. Key parameters of Weibull distribution are discussed for proper representative of manufacturing and testing process. Based on the study results, one prediction method for reliability of bushing fatigue life is proposed.
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