A cyclically pressurized hydraulic component made of compacted graphite iron (CGI) is examined in fatigue design. This CGI component has a notch, formed at the intersection of two drilling channels. This notch causes the stress to be locally elevated and may potentially serve as a fatigue initiation site. Traditional fatigue design approaches calculate the maximum stress/strain range acting at the notch and apply the Neuber correction when calculating fatigue life. It is, however, found that the fatigue life is dramatically underestimated by this method. This prompts the use of the critical distance method because the stresses are concentrated in a relatively small volume. When using the critical distance method, the fatigue life is correctly predicted. Finally, a fracture mechanics model of the crack check the reasonableness of the critical distance method results. The fracture mechanics model predicts that even if a crack were present, it would not propagate, which is consistent with the critical distance fatigue calculation.
FEA-Based Fatigue Life Prediction of a Notched CGI Component
Sae Int. J. Engines
Commercial Vehicle Engineering Congress ; 2011
Sae International Journal of Engines ; 4 , 3 ; 2756-2766
2011-09-13
11 pages
Conference paper
English
FEA-Based Fatigue Life Prediction of a Notched CGI Component
British Library Conference Proceedings | 2011
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