摘要
目的揭示拉伸加载下发动机黏接界面的损伤破坏规律,以及典型参数对该损伤破坏过程的影响规律。方法以建立的含预制宏观裂纹的硝酸酯增塑聚醚(NEPE)推进剂装药的黏接界面结构的细观有限元模型为基础,开展发生推进剂内聚损伤破坏、推进剂/衬层黏接界面损伤破坏和混合型损伤破坏的数值仿真计算,讨论不同损伤破坏形式下的裂纹扩展规律,以及推进剂基体强度、颗粒/基体黏接界面模量和强度、推进剂/衬层黏接界面模量和强度对损伤位置和损伤程度等的影响规律。结果颗粒/基体黏接界面的“脱湿”是发生推进剂内聚损伤破坏时的主要损伤形式,损伤临界应变阈值约为30%。推进剂/衬层黏接界面损伤破坏时,裂纹扩展路径与预制裂纹方向一致。混合型损伤破坏包括颗粒/基体黏接界面“脱湿”、推进剂/衬层黏接界面脱黏和推进剂基体撕裂,裂纹在推进剂/衬层黏接界面发生扩展的临界应变阈值约为20%,颗粒/基体黏接界面发生“脱湿”损伤及裂纹扩展的临界应变阈值约为60%。推进剂基体强度、颗粒/基体黏接界面强度和推进剂/衬层黏接界面强度对装药黏接界面结构损伤破坏的影响更为显著,前2个参数的增大均能导致发生“脱湿”损伤的位置向推进剂/衬层黏接界面移动,黏接界面结构损伤破坏模式发生转变的临界推进剂/衬层黏接界面强度阈值处于0.80~1.00MPa。结论NEPE推进剂装药的黏接界面结构的损伤破坏形式和损伤程度随细观结构模型材料参数的不同而发生改变。
The work aims to reveal the damage failure law of the adhesive interface structure of a motor(SRM)under tensile loading and the effect of typical parameters on the damage failure process.Based on the established micro finite element model of the adhesive interface structure for nitrate ester plasticized polyether(NEPE)propellant with prefabricated macroscopic crack,numerical simulation calculations were carried out under three forms of cohesive failure in the propellant,propellant/liner adhesive interface debonding,and mixed failure.Then,the crack propagation law under each form of damage and the effects of the matrix strength,particle/matrix adhesive interface modulus and strength,propellant/liner adhesive interface modulus and strength on the location and degree of damage were discussed.The"dewetting"between the filled particles and matrix was the main damage when propellant cohesive failure occurred,and the critical strain threshold for this damage was about 30%.When the propellant/liner adhesive interface debonding occurred,the crack propagation path was consistent with the direction of the prefabricated crack.The damage forms of mixed failure included the filled-particles/matrix“dewetting”,propellant/liner debonding and propellant matrix tearing.The critical strain for crack propagation at the propellant/liner adhesive in-terface was about 20%,and the critical strain for the“dewetting”and crack propagation was about 60%.The effects of propellant matrix strength,particle/matrix adhesive interface strength,and propellant/liner adhesive interface strength on the damage failure of the adhesive interface structure were more significant.As the first two parameters increased,the location of the“dewetting”moved towards to the propellant/liner adhesive interface.At the same time,the critical strength threshold for propellant/liner adhesive interface that changed the damage failure mode of the adhesive interface structure was between 0.80 and 1.00 MPa.The damage mode and damage degree of the adhesive interface structure for NEPE propellant changes with the different material parameters of the microstructure model.
作者
王哲君
强洪夫
王广
韩永恒
陈家兴
武锐
WANG Zhejun;QIANG Hongfu;WANG Guang;HAN Yongheng;Chen Jiaxing;WU Rui(Rocket Force University of Engineering,Xi'an,710025,China;Military Representative Bureau of Naval Armament Depart-ment in Beijing Region,Beijing 100071,China;Inner Mongolia Institute of Dynamical Machinery,Hohhot 010010,China)
出处
《装备环境工程》
CAS
2024年第4期9-16,共8页
Equipment Environmental Engineering
基金
陕西省高校科协青年人才托举计划项目(20190504)。
关键词
黏接界面结构
损伤破坏
细观有限元
内聚破坏
黏接界面脱黏
混合型破坏
adhesive interface structure
damage failure
microscopic finite element
cohesive failure
adhesive interface debonding
mixed failure
