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为了提高大长径比发动机药柱结构完整性水平,基于三维黏弹性有限元法,计算某大长径比固体发动机在温度和内压荷载联合作用下的结构响应;研究伞盘结构及其位置对药柱最大Von Mises应变的影响规律;讨论当伞盘位于药柱中部时,伞盘最大Von Mises应变随伞盘宽度、深度以及顶部圆弧半径比的变化规律。结果表明,伞盘位于药柱中部时可以有效地降低大长径比药柱的最大Von Mises应变,增加伞盘宽度、深度或选取合适的半径比均可降低伞盘结构的最大Von Mises应变。所得结论可为固体发动机设计提供参考。
In order to improve the structural integrity of large aspect ratio engine pellets, the structural response of a large aspect ratio solid engine under the combined action of temperature and internal pressure was calculated based on the three-dimensional viscoelastic finite element method. The structure and position of the deck The maximum Von Mises strain on the column is discussed. The maximum Von Mises strain of the disk when the column is located in the middle of the column is discussed with the variation of the width, the depth and the radius of the top arc. The results show that the maximum Von Mises strain can be effectively reduced when the tray is in the middle of the column, and the maximum Von Mises strain of the tray structure can be reduced by increasing the width and depth of the tray or choosing the proper radius ratio. The conclusions can provide a reference for solid engine design.