摘要
为了准确地描述固体火箭发动机端羟基聚丁二烯(HTPB)推进剂/衬层黏接界面在不同温度下的力学特性,从试验和数值仿真两方面研究了该黏接界面的Ⅰ型破坏特性。首先,通过单轴拉伸实验获取了不同温度下的载荷-位移曲线,并采用高速摄像机获取了黏接界面的破坏过程,分析了黏接界面的破坏形式,发现HTPB推进剂/衬层黏接界面的破坏形式为HTPB推进剂的内聚破坏,表明黏接界面的强度高于推进剂的强度;由-40℃升高到60℃的过程中特征位移先增大后减小,说明特征位移受温度因素影响明显。在双线性内聚力模型的基础上构建了一种损伤变量为多项式的内聚力模型,通过开展数值仿真计算,比较了不同界面模型参数在预测各温度下黏接界面力学特性的准确性,并以特征位移作为已知参数预测了不同温度下的黏接界面载荷-位移曲线,数值预测结果与实验结果保持一致,说明所建界面模型能够比双线性内聚力模型更加真实准确地反映固体火箭发动机黏接界面I型破坏的温度相关特性。
To study the mechanical properties of Hydroxyl-Terminated Polybutadience(HTPB)propellant/liner bonding interface for solid rocket motor at different temperatures accurately,the model-Ⅰ fracture properties of the interface were studied with experimental method and simulation. Firstly,the load-displacement curves of the test samples at different temperatures were obtained through uniaxial tensile tests and the failure process of the samples were also recorded with the high-speed cameras. It was found that the failure form of HTPB propellant/liner interface was cohesive failure of HTPB propellant,which indicated that the strength of bonding interface was higher than that of the propellant. From-40 ℃ to 60 ℃,the critical displacement first increased and then decreased,indicating that the effect of temperature on this parameter is obvious. And then a cohesion model with polynomial damage variable was developed,based on the bilinear cohesion law. According to the simulation data,the effects of the interface parameters on the predicted results of the interface properties at different temperatures were analyzed. Moreover,the load-displacement curves of the bonding interface at different temperatures were predicted with the critical displacement as a known parameter. It found that the predicted results by simulation were in agreement with the experimental results,which indicates that the developed interface model can more accurately reflect the temperature-dependent behavior of model-Ⅰfracture of the debonding interface for solid rocket motor than the bilinear cohesion model.
作者
丁伍
许进升
周长省
王庭钰
侯宇菲
DING Wu;Xu Jin-sheng;ZHOU Chang-sheng;WANG Ting-yu;HOU Yu-fei(School of Mechanical Engineering,Nanjing University and Technology,Nanjing 210094,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2022年第2期146-154,共9页
Chinese Journal of Energetic Materials
