PBX有效弹性性能研究进展

Progress in Predicting the Effective Elastic Properties of PBX

高聚物粘结炸药(PBX)是一种颗粒高度填充的含能复合材料,其单质炸药晶体的体积百分含量通常达到了85%以上。在室温和低应变率条件下,炸药晶体与粘结剂两相模量对比可达3～4个数量级,PBX的这两个特点使传统复合材料相关理论不再适用。因此,PBX有效弹性性能的模拟与预测对复合材料力学和细观力学提出了巨大挑战。本文介绍了国内外在PBX有效弹性性能模拟与预测方面所进行的工作,对各种预测方法的优缺点以及应用前景进行了简要的评述,指出了PBX有效性能模拟与预测需要解决的问题以及下一步工作的重点。

Polymer bonded explosives are particulate composites containing elastic particles in a viscoelastic binder. The particles occupy an extremely high fraction of the volume, often greater than 85%. Under low strain rate loading and at about room temperature,the elastic modulus of the particles can be four order of magnitude higher than that of the binder. These two characteristics make effective elastic properties predict more difficultly. As a result, PBXs provide unique challenges for micromechanical modeling. Some mieromechanical-based methods for the determination of mechanical properties of PBX were introduced, the advantages/disadvantages and the prospects of these methods were reviewed briefly. Three-dimensional models with damage,using computed tomography images and simulating manufacturing process are suggested to be the key point of future work.