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<p>A finite element model of a φ480 mm filament-wound composite solid rocket motor casing was developed to investigate progressive damage and burst behaviour. The analysis combined a Hashin-based intralaminar failure criterion, stiffness degradation, and an interlaminar cohesive damage model. For the baseline layup, damage initiated in the dome at 15.56&#xa0;MPa, expanded markedly at 22.20&#xa0;MPa, and resulted in burst at 25.57&#xa0;MPa, indicating a dome-dominated failure mode. An optimized layup based on polar-opening expansion was then introduced to improve load distribution between the dome and the cylindrical section. After optimization, damage initiation was delayed to 17.86&#xa0;MPa, the final burst pressure increased to 27.76&#xa0;MPa, and the burst location shifted from the dome to the cylindrical section. At the same time, the structural efficiency increased significantly, with the pressure–volume-to-weight ratio (PV/W) increasing from 38.9 to 46.1. Hydrostatic burst tests agreed well with the numerical predictions, and the error in burst pressure was less than 5%. The results show that the optimized layup can improve both burst resistance and structural efficiency, while promoting a more rational failure mode for the composite casing.</p>

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Progressive Damage Analysis and Experimental Validation of Failure-Path Transition in Filament-Wound Composite Solid Rocket Motor Casings

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Yonghao Li,
  • Yi Wang,
  • Jingyu Zhao,
  • Zhixu Zhang,
  • Zhipeng Xu,
  • Yang Zhang,
  • Decheng Li,
  • Bo Yang,
  • Jianyu Liu,
  • Xinyue Leng,
  • Yue Kong,
  • Shuohan Shen,
  • Song Lin,
  • Linan Xu,
  • Yilei Yue

摘要

A finite element model of a φ480 mm filament-wound composite solid rocket motor casing was developed to investigate progressive damage and burst behaviour. The analysis combined a Hashin-based intralaminar failure criterion, stiffness degradation, and an interlaminar cohesive damage model. For the baseline layup, damage initiated in the dome at 15.56 MPa, expanded markedly at 22.20 MPa, and resulted in burst at 25.57 MPa, indicating a dome-dominated failure mode. An optimized layup based on polar-opening expansion was then introduced to improve load distribution between the dome and the cylindrical section. After optimization, damage initiation was delayed to 17.86 MPa, the final burst pressure increased to 27.76 MPa, and the burst location shifted from the dome to the cylindrical section. At the same time, the structural efficiency increased significantly, with the pressure–volume-to-weight ratio (PV/W) increasing from 38.9 to 46.1. Hydrostatic burst tests agreed well with the numerical predictions, and the error in burst pressure was less than 5%. The results show that the optimized layup can improve both burst resistance and structural efficiency, while promoting a more rational failure mode for the composite casing.