In this study, work was carried out to investigate the fatigue life of engine bearings. A mathematical model was developed which utilises Miner’s rule to work out the total damage to an engine bearing when it is subject to all sorts of operational conditions. Given the fact that bearing fatigue rating has been traditionally tested against the specific load applied to bearings in test rigs, it was appropriate to develop a model using the specific load applied to a bearing, instead of the stress values in the bearing lining material. The model was then used to compare the life of con-rod bearings of a high performance diesel engine used on the road to that tested in the lab on test beds. The analysis showed the test procedure used in lab tests induced more severe damage than in the engine bearings in normal road use for design life.

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