In order to accurately predict the swing fatigue life of flexible joint,the cracking energy density(CED)was used as the damage parameter to drive the fatigue crack growth of elastomers.The swing fatigue life prediction model of flexible joint was established by means of fatigue crack growth test and uniaxial tensile fatigue test.The CED of flexible joint under 12.3 MPa and 6° swing angle was calculated by using the finite element analysis results,and then the swing fatigue life of flexible joint was predicted.The results showed that the predicted swing fatigue life of the flexible joint under the test condition was 107 cycles,which was consistent with the measured fatigue life of 120 cycles,and the predicted crack location and crack plane were in good agreement with the failure position of test.The ratio of predicted life to measured life was 1/1.12 within the double dispersion factor,which was acceptable in engineering.
关键词
疲劳寿命预测/柔性接头/开裂能密度/裂纹扩展/有限元分析/固体火箭发动机
Key words
fatigue life prediction/flexible joint/cracking energy density/crack propagation/finite element analysis/solid rocket motor
维普
万方数据