基于J积分的HTPB推进剂温度相关断裂韧性仿真研究  

Simulation study of fracture toughness of HTPB propellant with temperature-dependent J-integral

作　　者：王庭钰 陈雄[1] 许进升[1] 黄薇[1] 王金东 WANG Tingyu;CHEN Xiong;XU Jinsheng;HUANG Wei;WANG Jindong(Key Laboratory of Special Engine Technology,Ministry of Education,School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;JinXi Industries Group Co.,Ltd,Taiyuan 030027,China)

机构地区：[1]南京理工大学机械工程学院,特种动力技术教育部重点实验室,江苏南京210094 [2]晋西工业集团有限责任公司,山西太原030027

出　　处：《推进技术》2025年第4期234-242,共9页Journal of Propulsion Technology

基　　金：国家自然科学基金(52105107)。

摘　　要：针对含药柱裂纹的固体火箭发动机在其服役期间,药柱裂纹是否发生力学扩展的问题,本文基于HTPB推进剂材料,使用考虑“零时间”及三参数WLF方程的热-粘弹本构模型对单边缺口试件的拉伸过程进行仿真,并在J积分的计算中考虑了粘弹性材料的蠕变耗散能,通过与试验结果的对比,验证了理论模型的准确性。研究结果表明,针对单边缺口拉伸(SENT)试件,在使用UMAT子程序计算J积分时,需要考虑粘弹性材料的蠕变耗散能,之后便能够取得较为精确的计算结果;同时在使用了本文的本构模型后,对于宏观载荷位移曲线的平均计算误差相较于经典热-粘弹本构模型减小了10.32%;对于裂纹尖端局部J积分计算,误差减小了15.44%;对于临界断裂韧性JIC的计算,误差减小了3.58%。At present,the issue of whether cracks on a propellant grain undergo mechanical propagation during the service life of a solid rocket motor still requires in-depth study.Therefore,a thermo-viscoelastic con-stitutive model considering the“zero time”and the three-parameter WLF equation has been used for simulating the tensile process of single-edge notched specimens manufactured from a HTPB propellant material,and the creep dissipation energy of the viscoelastic material has been taken into account in the calculation.The simulation results have been compared with the experimental results hence verifying the accuracy of the theoretical model.The results show that the creep dissipation energy of the viscoelastic material needs to be taken into account when the J-integral is calculated using the UMAT subroutine for the single-edge notched tension(SENT)specimen,after which accurate results can be obtained.According to the simulation method proposed in this paper,the aver-age computational error for the macroscopic load-displacement curves is reduced by 10.32%compared to the classical thermo-viscoelastic constitutive model,the error for the localized J-integral computation at the crack tip is reduced by 15.44%,and the error for the calculation of the critical fracture toughness JIC is reduced by 3.58%.

关 键 词：HTPB推进剂 热-粘弹性 断裂 J积分 有限元法 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程] V231.95