| Citation: |
MOU Xing, LIU Hao, FAN Yuhui, et al. Structural design and damage failure analysis of cone-cylinder integrated composite case[J]. Acta Materiae Compositae Sinica, 2025, 42(5): 2902-2913.
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The cone-cylinder integrated composite case is an emerging bearing structure form of the solid rocket motor, the fiber wound structure is complex compared with the straight cylindrical structure, and the failure process and the ultimate failure mode when undertaking the internal pressure load are not clear. Therefore, a cone-cylinder integrated composite case simulation model was built to study the trajectory patterns, failure mode, fracture position, and burst pressure. A significant stress mutation exists at the transition region of the straight and the cone parts, which weakens the undertaking capacity of the composite case. All fiber fracture at this region of hoop layer exhibits fracture ultimately. The study results can apply a reference when designing and failure analysis for the cone-cylinder integrated composite case.
Considering the complex stress response and damage evolution process, a cone-cylinder integrated simulation model of composite case was built to investigate the damage discipline.
The trajectory pattern of cone, cylinder and dome parts were obtained by the non-geodesic trajectory. The thickness distribution of dome was obtained by thickness prediction method. Due to the winding angle was variable at the cone and dome parts, a discrete and axis-symmetry simulation model was built describe the structural feature. The boundary condition was specified at the middle section plane of the cylindrical part. The internal pressure load was carrying put on the internal surface. The Hashin failure criterion was adopted to decide the failure state of the elements.
The simulation results indicate that the stress mutation exhibits at the transition region between the cone and cylinder parts. This phenomenon causes the matrix failure when pressure load. And ultimately contributes to the fiber tows failure ahead than the cylinder part.Conclusion: (1)Compare with the cylindrical composite case, the winding trajectories present nonlinear feature of the cone-cylinder integrated composite, and being obviously following with cone angle increase.(2)The shear in thickness direction and the bending moment along the meridian direction make the stress has discrepancy at the two side of the cone and cylinder part. The cone angle decrease the stress level compare with the original cylinder ,and makes the little polar hole part safe than the other.(3) The damage region primarily clustering at left and right equatorial circle, the intersection of the cone and cylinder. The damage velocity increase with the loading advance, which accelerating the failure process, and ultimately contribute to the fiber tows frature.
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杨元林，李英，陈丽佳，牛连斌. 钙钛矿太阳能电池中顶电极的研究进展. 功能材料. 2022(07): 7040-7057 .
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