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Opening and closing fatigue life prediction of automotive hood based on transient response analysis

ZHANG Yan;MENG Fanliang;WU Zexun;WANG Changsheng;Automobile Engineering Technology Research Institute,Chery Automobile Co.,Ltd.;  
The opening and closing fatigue life of an automobile hood is predicted and analyzed by finite element method. Based on Abaqus / Explicit,the transient response is analyzed for the hood using direct integration method,and the time history of hood stress during closing is obtained; the discrete stress cycles are obtained by rain-flow counting method,and the equivalent stress spectrum is achieved by mean stress modification algorithm; according to the Miner linear fatigue damage cumulative theory,the fatigue life and the risk region of the hood are predicted. The optimized hood structure is verified by test.
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