基于轴对称内聚力单元的立贮发动机黏接界面结构完整性分析

建立轴对称内聚力单元是进行立贮发动机黏接界面应力分析的重要手段。在变形后的轴对称内聚力单元上建立参考坐标系，推导了单元节点位移在参考坐标系和全局坐标系下的转换关系。基于单元分离位移推导了单元内力矢量和单元刚度矩阵。开展了旋转体的分离测试，验证了轴对称内聚力单元的准确性和高效性。针对立贮发动机，先后开展了轴向加速度以及波浪载荷作用下的发动机结构分析，重点研究了黏接界面上应力的大小以及分布规律。研究方法和结论可以为发动机黏接界面结构分析提供有利参考。

Structural integrity analysis of bonding interface of vertical storage motor based on axisymmetric cohesive element

The establishment of axisymmetric cohesive force element is an important method to conduct stress analysis of the bonding interface of vertical storage motor. The reference coordinate system was established on the deformed axisymmetric cohesive force element, and the transformation relationship between elemental node displacement in the reference coordinate system and the global coordinate system was derived. The internal force vector and the stiffness matrix of the element were derived based on the elemental separation displacement. The separation test of the axisymmetric bonding plate was carried out to verify the accuracy and efficiency of the axisymmetric cohesive force element. The structural analysis of solid rocket motor in vertical storage under axial acceleration and wave load has been carried out successively, and the magnitude and the distribution pattern of stress at the bonding interface have been studied emphatically. The research method and its conclusion can provide a useful reference for the structural analysis of bonding interface of solid rocket motor.