| Citation: | ZHANG Jinyao, REN Junxue, XUE Muyao, et al. Prediction of the swing fatigue life of flexible joint based on cracking energy density[J]. Journal of Aerospace Power, 2024, 39（10）：20220826 doi: 10.13224/j.cnki.jasp.20220826
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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.
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