Refined modeling and damage failure analysis of a large T800 shell structure
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摘要:
利用Python对ABAQUS二次开发的方法,建立了精细化的壳体后封头结构模型。针对复合材料壳体封头纤维缠角及厚度不断变化的特点,编制计算程序,精确计算出封头部位每个纵向缠绕层缠绕角的大小以及缠绕层随半径变化的层厚,较真实地建立了固体火箭发动机复合材料壳体后封头结构的有限元分析模型,在一定内压载荷下对其应变情况进行了分析。将分析的结果与试验结果比较, 验证了该模型的准确性。使用UMAT(user-defined material)子程序,引入损伤失效准则对壳体结构进行了损伤失效分析,进一步获取了该结构在内压载荷逐渐增加时,其破坏位置,破坏形式,最终得出了该缠绕层结构的最终破坏形式为封头靠近赤道位置处的纤维断裂破坏,对今后的复合材料壳体结构设计提供了依据。
Abstract: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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Key words:
- filament wound /
- composite shell /
- refined model /
- damage mechanics /
- progressive damage /
- failure mode
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表 1 试件材料性能参数
Table 1. Material performance parameters of specimen
材料 参数 数值 T800 拉伸模量/GPa 290 拉伸失效应力/MPa 5820 断裂延伸率/% 2.0 体密度/(g/cm3) 1.8 线密度/(g/km) 445.5 树脂 拉伸模量/GPa 3.33 压缩模量/GPa 3.49 弯曲模量/GPa 3.94 切变模量/GPa 1.0 拉伸失效应力/MPa 94.3 压缩失效应力/MPa 150 弯曲强度/MPa 155 表 2 T800碳/环氧复合材料性能参数
Table 2. Performance parameters of T800 carbon fiber/epoxy resin composites
参数 数值 拉伸模量/GPa E11 173 E22 11.4 E33 11.4 切变模量/GPa G12 1.91 G13 1.91 G23 1.91 泊松比 $ \mathrm{\nu } $12 0.22 $ \nu $13 0.22 拉伸失效应力/MPa Xt 3157 Yt 63.1 压缩失效应力/MPa Xc 2525.5 Yc 189.4 剪切失效应力/MPa 50 基体失效能/(MPa·mm1/2) 1 纤维失效能/(MPa·mm1/2) 12.5 黏性正则化系数 0.001 表 3 缠绕层工艺参数
Table 3. Winding layer process parameters
缠绕层 退移量/mm 起始位置/mm 纵向层1 0 环向层1~2 553 纵向层2 0 环向层3~4 553 纵向层3(退移) 25±5 环向层5~6 553 纵向层4 0 环向层7~8 553 纵向层5(退移) 30±5 环向层9~10 553 纵向层6 0 环向层11~12 553 纵向层7(退移) 50±5 环向层13~14 553 纵向层8(退移) 40±5 环向层15~16 553 纵向层9 0 环向层17~18 553 纵向层10 0 环向层19~20 553 纵向层11 0 表 4 接头、堵盖及弹性层材料性能参数
Table 4. Material properties of joint, gasket and closure
材料 参数 数值 铝 弹性模量/GPa 70 泊松比 0.3 密度/(g/cm3) 2.7 橡胶 弹性模量/GPa 0.08 泊松比 0.48 钢 弹性模量/GPa 200 泊松比 0.3 表 5 方向向量
Table 5. Direction vector
新坐标 方向向量 OX $ -\dfrac{2{x}_{0}{y}_{0}}{{b}^{2}},\dfrac{2\left({{x}_{0}}^{2}+{{{\textit{z}}}}_{0}^{2}\right)}{{a}^{2}},-\dfrac{2{y}_{0}{{\textit{z}}}_{0}}{{b}^{2}} $ OY $ {{\textit{\textit{z}}}}_{0},0,-{x}_{0} $ OZ $ \dfrac{{2}{{x}}_{{0}}}{{{a}}^{{2}}}{,}\dfrac{{2}{{y}}_{{0}}}{{{b}}^{{2}}}{,}\dfrac{{2}{{{\textit{\textit{z}}}}}_{{0}}}{{{a}}^{{2}}} $ 注:表中a、b、c为椭球形状参数。 表 6 壳体水压爆破实验结果
Table 6. Results of hydrostatic burst tests of composite cases
序号 压强/MPa 最大顺纤维应变 筒身最大环向应变 01 16.2 0.0100 0.0118 -
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