固黑铝炸药的流变性能及本构方程研究

Research on Rheological Properties and Constitutive Equation of GHL Explosive

为了获得固黑铝炸药流变性能变化规律和本构方程,采用旋转流变仪对RDX/Al/HTPB/DOA药浆在不同固含量、不同温度下的动态流变性能和稳态流变性能进行了系统测试,考察了固含量和温度对固黑铝炸药流变性能影响,并对典型配方的本构方程进行计算。结果表明:在小剪切应力作用下储能模量、损耗模量和复数粘度均随固含量的增加而变大。当固含量为84%且在低角频率下,模量之间差值达27.046 Pa,此时药浆的流动性能最佳。在大剪切应力作用下的表观粘度在不同固含量下都呈现剪切变稀的状态,随着固含量提高至88%后,表观粘度在0.1~10 s^(-1)的剪切速率下明显增大。随着温度升高,药浆的稠度系数和非牛顿指数分别呈下降和上升趋势,流变综合性能提高。此外,在20~60℃,84%固含量固黑铝炸药本构方程为:η=0.00747 exp(2839.09695/T)γ^(-0.33957)。

In order to obtain the change law and constitutive equation of the rheological properties of GHL explosives,the dynamic rheological properties and steady-state rheological properties of RDX/Al/HTPB/DOA slurry at different solid contents and different temperatures were measured by a rotary rheometer.Systematic tests were carried out to investigate the influence of solid content and temperature on the rheological properties of GHL explosives,and the constitutive equations of typical formulations were calculated.The results show that the storage modulus,loss modulus and complex viscosity all increase with the increase of solid content under small shear stress.When the solid content is 84%and at a low angular frequency,the difference between the moduli reaches 27.046 Pa,and the flow performance of the slurry is the best.The apparent viscosity under the action of large shear stress shows a state of shear thinning at different solid content.As the solid content increases to 88%,the apparent viscosity is obvious at a shear rate of 0.1~10 s^(-1) increase.As the temperature rises,the consistency coefficient and non-Newtonian index of the slurry show a downward and upward trend respectively,and the overall rheological properties increase.In addition,in the range of 20~60℃,the constitutive equation of 84%solid black aluminum explosive is:η=0.00747 exp(2839.09695/T)γ^(-0.33957).