Experimental Investigation on Residual Stress and Fatigue Strength of Diesel Engine Connecting Rods
Connecting rod is subjected to complex loads during engine operation,and the residual stress can lead to early failure of components such as connecting rod.The residual stress measurement and analysis under two different structural design schemes and surface process conditions of a diesel engine connecting rod were carried out and the fatigue strength of the better design scheme was studied by experiment.The test results show that the residual stress distribution of the two connecting rod schemes is similar,the distri-bution is uniform,and the stress value is mainly distributed around 400 MPa,but there were still obvious differences of the residual stress values at the connection between the small head and the shaft.In the fatigue test,the fracture position of the connecting rod were easy to occur at the connection between the small head hole and the shaft,and the allowable strengthening coefficient of the connecting rod was between 1.15 and 1.20.
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