In order to study the mechanical behavior of solid rocket motor charge bonding interface under uniaxial tensile loading, the bonding interface of HTPB propellant/liner/insulator during uniaxial tensile process was scanned and reconstructed based on micro-CT in-situ loading, and the variation of porosity and interface debonding rate with strain was analyzed. A damage-containing constitutive model based on the evolution of meso-characteristic parameters was established for bonded interfacial components. The experimental analysis shows that the initial defects have a great influence on the location and evolution direction of the interface damage, and the interface damage can be quantitatively characterized by the interface debonding rate and porosity, and the interface debonding rate can better reflect the damage evolution process of micro-pores and cracks near the propellant/liner interface. The damage-containing constitutive model based on the evolution of mesoscopic characteristic parameters can effectively establish the structure-activity relationship between mesoscopic parameters and macroscopic mechanical properties, and can predict the mechanical behavior of charge interface.

中文翻译：

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单轴拉伸载荷下 HTPB 推进剂键合界面的微观力学行为

为研究固体火箭发动机装药结合界面在单轴拉伸载荷下的力学行为，基于micro-CT原位加载对HTPB推进剂/衬套/绝缘体单轴拉伸过程中的结合界面进行扫描重建，发现分析了孔隙率和界面剥离率随应变的变化。建立了基于细观特征参数演化的含损伤界面构件的本构模型。实验分析表明，初始缺陷对界面损伤的位置和演变方向有很大影响，界面损伤可以通过界面脱粘率和孔隙率来定量表征，界面剥离率更能反映推进剂/衬里界面附近微孔和裂纹的损伤演化过程。基于细观特征参数演化的含损伤本构模型可以有效建立细观参数与宏观力学性能之间的构效关系，并可以预测电荷界面的力学行为。