Visco-hyperelastic constitutive modeling of the dynamic mechanical behavior of HTPB casting explosive and its polymer binder
Visco-hyperelastic constitutive modeling of the dynamic mechanical behavior of HTPB casting explosive and its polymer binder
复制标题
HTPB铸造炸药及其聚合物粘结剂动态力学行为的粘超弹本构模型
DOI：
10.1007/s00707-020-02655-1
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发表时间：
2020-06-01
期刊：
影响因子：
2.7
通讯作者：
Sun, Yi
中科院分区：
文献类型：
--
作者：
Xiao, Youcai;Fan, Chenyang;Sun, Yi
建立了一个新的粘-超弹性本构模型，用于描述聚合物粘结炸药（60wt%RDX，16wt%Al，24wt%HTPB）及其粘结剂的动态压缩行为。本构关系包括两部分：一部分是表征大变形的应变能函数，另一部分是描述动态粘弹性行为的粘弹性模型。超弹性模型参数的曲线拟合使用准静态压缩试验数据下的应变率。通过不同温度下的松弛试验，研究了基于时间-温度叠加原理的主模量曲线，通过拟合主模量曲线，得到了其压缩松弛时间和压缩松弛模量。为了获得合理的动态压缩结果，设计了一种改进的分离式Hopkinson压杆装置，使试件处于动态应力平衡状态，并在近似恒定的应变率下均匀变形。与实验结果的本构关系的比较显示了良好的协议，并表明其潜力来描述PBX及其聚合物粘结剂的动态力学行为。
A new visco-hyperelastic constitutive model is developed to describe the dynamic compressive behavior of polymer-bonded explosive (60 wt% RDX, 16 wt% aluminum, and 24 wt% HTPB) and its polymer binder. The constitutive relationship comprises two parts: a component with a strain-energy function to characterize large deformation and a viscoelastic model to describe dynamic viscoelastic behavior. The hyperelastic model parameters are curve-fitted using quasi-static compressive test data under a strain rate of. The time–temperature superposition principle master modulus curves are studied using relaxation tests at different temperatures, and their compressive relaxation time and modules are obtained by fitting the master modulus curves. To obtain the rational dynamic compressive results, a modified split-Hopkinson compressive bar setup is designed such that the specimens are in dynamic stress equilibrium and deformed homogeneously at nearly constant strain rates. A comparison of the constitutive relationship with the experimental results revealed a good agreement and demonstrates its potential to describe the dynamic mechanical behavior of the PBX and its polymer binder.