基于Voronoi细观数值模型预测PBX的有效弹性模量

为探讨高聚物粘接炸药(PBX)细观结构对其有效弹性模量的影响,采用有限元方法分析对比了六边形颗粒、不同分布形式的圆形颗粒、基于Voronoi方法建立的不规则多边形颗粒等细观数值模型。结果表明,颗粒形貌和分布对PBX的有效模量影响显著。Voronoi细观数值模型不仅可以实现PBX材料颗粒的高填充度(85%),也可以通过不规则多边形颗粒更好地刻画PBX的细观结构,其杨氏模量预测结果为1.41 GPa,与实验值接近;杨氏模量、体积模量、剪切模量随颗粒含量增加近似指数上升,而泊松比随颗粒含量的增加快速下降。

Predicting the Effective Elastic Modulus of PBX Based on Voronoi Meso-scale Numerical Model

To investigate the influence of meso-structure of polymer bonded explosive(PBX) on the effective elastic modulus of PBX,several meso-scale numerical models were analyzed and compared by finite element method,including hexagonal particle models,circular particle models in different particle distributions and irregular polygonal particle models established by Voronoi method.Results indicate that particle shape and distribution have remarkable influences on the effective modulus of PBX.Voronoi numerical model can not only achieve the high filling degree(>85%)of particle for PBX material,but also the meso-structure of PBX can be better resembled by irregular polygonal particle.Young′s modulus predicted by Voronoi model is 1.41 GPa,which is close to the experimental value.With increasing the particle content,Young′s modulus,bulk modulus and shear modulus increase in approximate exponent,while Poisson′s ratio decreases rapidly.