论文部分内容阅读
准静态载荷下的拉伸压缩试验中,几乎所有高聚物粘结炸药(PBX)都体现出了明显的非线性本构行为,现常用的本构模型在描述这种非线性时适应性不甚理想。针对五种典型PBX炸药(PBX-X,PBX-9502,LX-17,PBX-9501,EDC-37)应力应变曲线的非线性及非对称性,基于Boltzmann函数推导了一种拉伸和压缩一起考虑的准静态单轴非线性四参数本构模型。在讨论模型待定参数物理意义的基础上,基于文中提出的待定参数初值确定方法,采用该本构模型对五种典型PBX的应力应变曲线进行了拟合。结果表明,该本构模型可较好地描述五种典型PBX炸药不同温度和应变率下的本构行为。基于Boltzmann函数的拉压非线性本构模型,有望作为一种适用于不同PBX的通用准静态本构模型广泛运用。
In the tensile compression test under quasi-static load, almost all polymer-bound explosives (PBX) exhibit obvious nonlinear constitutive behavior. The constitutive models used in the present study describe the nonlinearity when adaptability Very ideal. Aiming at the nonlinear and asymmetric stress-strain curves of five typical PBX explosives (PBX-X, PBX-9502, LX-17, PBX-9501 and EDC-37) A quasi - static uniaxial nonlinear four - parameter constitutive model considered. Based on the discussion of the physical meaning of the model parameters to be determined, the stress-strain curves of five typical PBXs were fitted by using the constitutive model based on the method of initial value determination of the parameters to be determined. The results show that this constitutive model can describe the constitutive behavior of five typical PBX explosives under different temperatures and strain rates. Based on Boltzmann’s function, nonlinear constitutive model of tension and compression is expected to be widely used as a general quasi-static constitutive model suitable for different PBX.