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底排药的高应变率动态响应实验和仿真 被引量:7

Numerical Simulation and Mechanical Behavior of Base Bleed Grain at High Strain Rate
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摘要 利用直径14.5 mm铝制霍普金森压杆(SHPB),对直径为10 mm的底排药柱试样进行应变率在103s-1量级的单轴压缩试验。实验结果表明底排药具有明显的应变率效应。利用朱王唐粘弹性本构关系,采用最小二乘法,依据实验数据拟合出朱王唐本构材料参数,并利用LS-DYNA软件的二次开发功能将拟合出的朱王唐粘弹性本构嵌入LS-DYNA软件中,进行SHPB的数值仿真模拟,与实验对比表明在应变小于0.03弹性范围内仿真模型能够很好地描述底排药高应变率力学特性。 Aluminum split Hopkinson pressure bar(SHPB) with diameter of 14.5 mm was used to perform the uniaxial compres- sion tests on base bleed grain specimens with diameter of 10 mm at the strain rate of 10^3s^-1 . Results show that the base bleed grain has obvious strain rate effects. Zhu-Wang-Tang (Z-W-T) constitutive model was adopted to describe the mechanical behavior of base bleed grain and the coefficients in Z-W-T model were obtained via the least square method based on the experimental results. Using the LS-DYNA software secondary development feature, the fitted Z-W-T viscoelastic constitutive relationship was embedded into the LS-DYNA software to simulate the experiments numerically. Comparisons between experimental and caculated results show that the numerical model can simulate the high strain rate properties of the base bleed grain very well in small-strain elastic range less than 0.03.
出处 《含能材料》 EI CAS CSCD 北大核心 2014年第4期529-534,共6页 Chinese Journal of Energetic Materials
基金 国家自然科学基金资助(51278250)
关键词 冲击动力学 底排药 高应变率 朱王唐本构 霍普金森压杆(SHPB) impact dynamics base bleed grain high strain rate Zhu Wang Tang(Z-W-T) constitutive split hopkinson pressurebar( SHPB )
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