HTPB固体推进剂蠕变损伤模型研究  

Research on Creep Damage Model of HTPB Solid Propellant

作　　者：吴轩 郑健[1] 许进升[1] 李辉 罗熙斌 WU Xuan;ZHENG Jian;XU Jin-sheng;LI Hui;LUO Xi-bin(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;China Huayin Weapon Test Center,Huayin Shaanxi 714200,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]中国华阴兵器试验中心,陕西华阴714200

出　　处：《火炸药学报》2023年第3期260-265,I0010,共7页Chinese Journal of Explosives & Propellants

基　　金：国防科技卓越青年人才基金(No.2011-JCJQ-ZQ-072)。

摘　　要：为研究HTPB推进剂的蠕变特性,开展了0.15~0.35MPa应力下推进剂的单轴拉伸蠕变试验;结合线性黏弹性理论和连续损伤力学理论,建立了HTPB推进剂蠕变损伤模型;根据试验数据,确定了不同应力水平下蠕变损伤模型的参数,并获取了应力对各参数的影响规律,最后利用蠕变应力0.2MPa下的试验数据对模型进行了验证。结果表明,HTPB推进剂存在明显的衰减蠕变、稳定蠕变和加速蠕变三阶段过程;建立的蠕变损伤模型结合Burgers模型的特征和连续损伤力学理论,串联含损伤的黏壶元件,克服了Burgers模型无法反映蠕变破坏阶段特性的不足。提出的蠕变损伤模型与试验值拟合度高,误差在3%以内,可以准确地描述推进剂在不同应力水平下的全过程蠕变特性。In order to study the creep properties of HTPB propellant,the uniaxial tensile creep tests of propellant under 0.15—0.35MPa stress were carried out.The creep damage model of HTPB propellant was established by combining linear viscoelastic theory and continuum damage mechanics theory.Based on the test data,the parameters of the creep damage model under different stress levels were determined,and the influence law of stress on each parameter was obtained,finally the model was verified by using the test data under the creep stress of 0.2MPa.The results show that the HTPB propellant has obvious three-stage processes of decay creep,stable creep and accelerated creep,and the established creep damage model combines the characteristics of Burgers model and the continuous damage mechanics theory,and series the sticky pot elements with damage,which overcomes the deficiency of Burgers model that can t reflect the characteristics of creep failure stage.The creep damage model has a high fitting degree with the test value,with an error of less than 3%,and can accurately describe the creep characteristics of the propellant through the whole process under different stress levels.

关 键 词：材料力学 HTPB推进剂 蠕变性能 连续损伤模型 蠕变全过程 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] V512.3[航空宇航科学与技术—航空宇航推进理论与工程]