| Citation: | YU Linfeng, REN Quanbin, SONG Xueyu, et al. Refined modeling and damage failure analysis of a large T800 shell structure[J]. Journal of Aerospace Power, 2025, 40（1）：20230097 doi: 10.13224/j.cnki.jasp.20230097
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Using the method of Python’s secondary development of ABAQUS, a refined shell back head structure model was established. According to the characteristics of the fiber winding angle and thickness of the composite shell head, the calculation program was compiled to accurately calculate the winding angle of each longitudinal winding layer and the thickness of the winding layer varying with the radius. The finite element analysis model of the rear head structure of the solid rocket motor composite shell was established, and the strain was analyzed under certain internal pressure load. The accuracy of the model was verified by comparing the analysis results with the experimental results. The UMAT （user-defined material） subroutine was used to introduce the damage failure criterion to analyze the shell structure, and the failure position and failure form of the structure were further obtained when the internal pressure load gradually increased. Finally, it was concluded that the final failure form of the winding layer structure was the fiber fracture failure near the equatorial position of the head, helping to provide a basis for the design of the composite shell structure in the future.
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