HTPB推进剂/衬层粘接试件变形破坏过程试验与数值模拟

为得到粘接界面的力学行为和破坏模式，对HTPB推进剂/衬层粘接试件进行了单向拉伸宏观观察试验，获得不同拉伸阶段的变形图片，记录了界面破坏的全过程；使用界面元模型表征推进剂/衬层界面，数值模拟了粘接界面试件在单向拉伸作用下的脱粘过程。结果表明：界面拉伸变形破坏过程表现为裂纹的起裂、扩展和失效；粘接试件的拉伸应力-应变曲线表现出明显的非线性特征；数值计算结果与试验得到的应力-应变曲线及试件宏观变形失效形态一致。为得到粘接界面的力学行为和破坏模式，对HTPB推进剂/衬层粘接试件进行了单向拉伸宏观观察试验，获得不同拉伸阶段的变形图片，记录了界面破坏的全过程；使用界面元模型表征推进剂/衬层界面，数值模拟了粘接界面试件在单向拉伸作用下的脱粘过程。结果表明：界面拉伸变形破坏过程表现为裂纹的起裂、扩展和失效；粘接试件的拉伸应力-应变曲线表现出明显的非线性特征；数值计算结果与试验得到的应力-应变曲线及试件宏观变形失效形态一致。

Experimental and Numerical Simulation on Deformation and Debonding Processes of HTPB Propellant/Liner Adhesive Specimen

In order to obtain the mechanical behavior and failure mode of interface, the uniaxial tension experiments are conducted on HTPB propellant/liner adhesive specimen. The deformation images of various stages are achieved, and the debonding process is observed macroscopically. A cohesive element model is adopted to simulate propellant/liner interface. The results show that the failure mode experiences damage initiation, damage evolution and debonding, and the stress-strain response of adhesive specimen has a distinct nonlinear characteristic. The simulated results of stress-strain response and deformation are consistent with the data obtained from experiment.