摘要
为研究HTPB复合底排药(Composite Base Bleed Grain,CBBG)力学性能,进行了室温(28℃)下准静态单轴压缩和拉伸实验。基于对HTPB CBBG有限变形过程的非线性力学响应分析,建立了五元件黏弹-黏塑-损伤本构模型。模型预测结果表明,所建模型能够准确描述HTPB CBBG压缩和拉伸力学性能。获得的损伤演化律表明,达到屈服应变εy后,累积损伤值D和损伤因子f随应变ε近似线性增长,应变率ε降低4个量级,压应变为-0.62时、拉应变为0.24时的损伤程度分别增加了10.64倍和22.28倍,拉应力引起的材料损伤较压应力严重。结合所建模型编写了用户子程序VUMAT,利用ABAQUS/Explicit模拟了单轴拉伸实验。计算结果表明,应力应变曲线数值解与实验结果吻合良好,验证了VUMAT的正确性。
In order to achieve mechanical properties of HTPB composite base bleed grain(CBBG),quasistatic uniaxial compressive and tensile experiments were conducted at room temperature(28℃).Based on the analysis of HTPB CBBG’s nonlinear mechanical properties at finite deformation,a five-component viscoelasticviscoplastic damaged constitutive model was developed.Model predictions present that the developed model can characterize well both compressive and tensile mechanical responses of HTPB CBBG.Damage evolution curves indicate that the increment of cumulative damage value D and damage factor f is approximately linearly dependent on the increment of strain ε when ε is larger than yield strain εγ.When strain rate ε decreases by upto four orders of magnitude,the damage degree at the compressive strain of-0.62 and tensile strain of 0.24 increases by a factor of 10.64 and 22.28,respectively.Tensile stress can lead to much severer damage than compressive stress.The user subroutine VUMAT was then written according to the developed model and implemented into the finite element program ABAQUS/Explicit to simulate uniaxial tension experiments.Simulation results indicate that numerical stress-strain curves show satisfactory agreement with experimental data and the accuracy of the VUMAT is verified.
作者
武智慧
牛公杰
郝玉风
钱建平
刘荣忠
WU Zhi-hui;NIU Gong-jie;HAO Yu-feng;QIAN Jian-ping;LIU Rong-zhong(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China;Product Research and Development Center of Liaoshen Industries Group Co.Ltd.,Shenyang 110045,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2019年第12期2848-2855,共8页
Journal of Propulsion Technology
基金
国家自然科学基金(11402248)
关键词
HTPB复合底排药
黏弹性
黏塑性
损伤
本构模型
数值应用
HTPB composite base bleed grain
Viscoelasticity
Viscoplasticity
Damage
Constitutive model
Numerical implementation
