The sub-frame of one light commercial vehicle cracked during the road durability test,based on this problem,acquire the road load data of the ball joint of the control arm,and then calculated the pseudo-damage of the ball joint based on the virtual S-N curve.According to the Miner principle,calculated the whole life damage of the ball joint.Select the appropriate amplitude of the multi-level load spectrum,and get the cycle number of each level of load amplitude according to the principle of damage equivalence.The bench test of sub-frame and control arm is carried out based on the multi-level load spectrum that obtained by damage equivalence calculation,the result of the rig test reproduce the sub-frame crack of the road test,and the failure mode,life of the failure have a good correlation with the road test.The optimized sub-frame passes the bench test with the multi-level load spectrum,and also passes the road durability test.
维普
万方数据