Fracture Failure Analysis of Tensioner Swing-arm of Automobile Engine
The fracture failure occurred in the tensioner swing-arm of the automobile engine during the endurance test.The fracture failure reasons of the tensioner swing-arm were analyzed by a variety of meth-ods including macroscopic inspection,fracture surface morphology analysis,chemical analysis,metallo-graphic structure observation and hardness test.The results show that the effective bearing area was re-duced by the porosity defects in the source area of the tensioner swing-arm fracture.The additional stress concentration was caused in the porosity defect area with the action of external alternating load,and it ulti-mately led to fracture failure of the tensioner swing-arm.
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