立贮固体发动机黏接界面剪切破坏风险研究

目的 评估长期立贮固体发动机黏接界面因剪切变形导致破坏的风险。方法 对固体发动机黏接界面剪切试件进行高温加速老化,而后对老化剪切试样进行定速拉伸剪切试验,依据剪切试验结果,总结固体发动机黏接界面力学性能的老化规律。基于Arrhenius方程外推得到固体发动机黏接界面考虑老化的剪切变形破坏判据,采用该破坏判据对立式贮存15 a的某型固体发动机黏接界面因剪切变形发生破坏的风险进行评估。结果 黏接界面在经过15 a的老化后,其最大剪切变形为0.792 6 rad,比初始性能下降5.31%。选定某型固体发动机进行长期立贮工况计算,仿真计算结果显示,该固体发动机立贮15 s时,黏接界面危险点处的切向应变值0.463 3 rad。该值小于老化15 a后黏接界面剪切变形破坏起始点,即该发动机在立式贮存15 a后,界面剪切变形程度未达到破坏阈值。结论 该破坏判据能够较为直观地对长期立式贮存固体发动机黏接界面因剪切变形发生破坏的风险进行评估,可为长期贮存固体发动机黏接界面结构完整性评估提供借鉴参考。

Risk of Shear Failure at the Adhesive Interface of a Vertical Storage Solid Engine

The work aims to evaluate the risk of damage caused by shear deformation at the adhesive interface of long-term vertical storage solid engines. High temperature accelerated aging was performed on the shear specimens at the adhesive interface of solid engines, followed by constant speed tensile shear tests on the aged shear specimens. Based on the shear test results, the aging law of mechanical properties of the adhesive interface of solid engines was summarized. Based on the Arrhenius equation extrapolation, a shear deformation failure criterion considering aging at the adhesive interface of solid engines was obtained. This failure criterion was used to evaluate the risk of damage to the adhesive interface of a certain type of solid engine stored vertically for 15 years due to shear deformation. After 15 years of aging, the maximum shear deformation of the adhesive interface was 0.792 6 rad, which was 5.31% lower than the initial performance. A certain type of solid engine was selected for long-term vertical storage condition calculation, and the simulation results showed that the tangential strain value at the hazardous point of the adhesive interface of the solid engine after 15 years of vertical storage was 0.463 3 rad. This value was less than the starting point of shear deformation and failure of the adhesive interface after 15 years of aging, indicating that the degree of interface shear deformation of the engine did not reach the failure threshold. This failure criterion can intuitively evaluate the risk of damage to the adhesive interface of long-term vertical storage solid engines due to shear deformation, providing reference for the structural integrity assessment of the adhesive interface of long-term storage solid engines.