摘要
为了更加准确地研究HTPB推进剂/绝热层界面力学性能,根据某HTPB推进剂组成设计了等效模拟推进剂,随后浇注了HTPB推进剂/绝热层界面标准试验件并开展了界面破坏试验,测得加载点的载荷—位移曲线;通过对现有模型进行改进,得到了更加符合试验结果的内聚力模型,并结合Hooke-Jeeves优化算法反演得到了更加准确的界面参数;通过编写UMAT子程序对试验过程进行了仿真模拟。结果表明,所建立的界面模型能够很好地描述界面破坏过程的典型特征,反映出HTPB推进剂/绝热层黏接界面的软化特性,准确预测了界面的失效时刻;同时试验测得的黏接强度与真实值相差不大,修正量在4%以内;而断裂能则与真实值偏离较多,修正量均大于10%,模型参数需通过反演分析确定。表明了所建立的改进型内聚力模型的正确性,可用于固体火箭发动机装药黏接界面的力学性能模拟。
In order to study the mechanical properties of the interface of HTPB propellant/insulation more accurately,an equivalent simulated propellant was designed based on the composition of a certain HTPB propellant.Subsequently,the standard test specimen of the HTPB propellant/insulation interface was prepared,the interface failure test was carried out,and the load-displacement curve at the loading point was measured.By improving the existing model,a cohesive zone model that is more in line with the test results was obtained,and combined with the Hooke-Jeeves optimization algorithm for inverse analysis,more accurate interface parameters were obtained.The test process was simulated by using a UMAT subroutine.The results show that the established interface model can well describe the typical characteristics of the interface failure process,reflecting the softening characteristics of the HTPB propellant/insulation interface,and accurately predicting the failure moment of the interface.Meanwhile,the bonding strength measured in the test is not much different from the true value,and the correction amount is within 4%.However,the fracture energy deviates significantly from the true value,with correction amounts all exceeding 10%.The model parameters need to be determined through inversion analysis.It indicates the correctness of the cohesive zone model,and it can be used for the mechanical property simulation of bonding interface in solid rocket engines charge.
作者
王旭阳
陈雄
许进升
王琛禹
姜韶宇
WANG Xu-yang;CHEN Xiong;XU Jin-sheng;WANG Chen-yu;JIANG Shao-yu(Key Laboratory of Special Engine Technology,Ministry of Education,School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《火炸药学报》
北大核心
2025年第8期770-778,I0004,共10页
Chinese Journal of Explosives & Propellants
关键词
物理化学
模拟推进剂
HTPB推进剂
内聚力模型
界面脱粘
数值模拟
physical chemistry
simulated propellant
HTPB propellant
cohesive zone model
interface debonding
numerical simulation
作者简介
王旭阳(2000-),男,博士研究生。E-mail:1014912943@qq.com;通信作者:许进升(1985-),男,博士,教授。E-mail:xujinsheng@njust.edu.cn。
