颗粒炸药撞击加载下能量输运和再分配机理研究

Investigation of impact ignition of granular explosives is crucial to solve the issues related to the safety of energetic materials. During the process of impact ignition, based on the dynamic mechanical response of granular explosives, dynamic transportation and reallocation of energy, including translation, transfer, and deposition can be realized due to mechanical-thermal-chemical coupling. Unfortunately, the understanding to those key processes is still insufficient. Based on the micro and mesoscale information of granular materials, the project intends to establish the multi-physics model embedded with complicated dynamic response via combing peridynamics and discrete element method and coupling mechanical, thermal, and chemical processes. By using large scale simulations, the project will study dynamic processes such as deformation and breakage, collision and jetting, and temperature increase and ignition, explore the influence of granular properties and impact conditions on dynamic processes mentioned above. Moreover, the project will also analyze mechanisms of dynamic energy transportation and reallocation, and eventually boost understanding for impact ignition of granular explosives. The characteristics of this project are to combine microstructure of granular explosives and its macro response and to combine mechanical response and thermal evolution. The new mechanism and new criterion about impact ignition of granular explosives can be achieved based on this research, which have scientific significance for the research of non-shock ignition of energetic materials.

颗粒炸药撞击点火的研究对加深理解含能材料安全性问题有重要意义。撞击点火过程中，颗粒炸药在动态力学响应基础上，由力学-热学-化学反应耦合，实现能量的转化、传递、及沉积等动态输运和再分配。目前对这些关键过程的理解不足。该项目试图从颗粒炸药微细观结构出发，结合近场动力学和离散元方法，耦合力学-热学-化学反应等多物理过程，构建含复杂动态响应的多物理耦合计算模型。通过大规模数值计算模拟，研究颗粒炸药在撞击加载下变形破碎、碰撞抛射、及温升点火等动态过程，探索颗粒炸药物性参数、撞击条件对上述结果影响，分析能量动态输运和再分配机理，推进对颗粒炸药撞击点火过程和规律的认识。该项目将颗粒炸药微细观结构与宏观响应结合，将动态力学响应与温升演化结合，可望得到颗粒炸药撞击点火的新机制和建立新准则，这对含能材料非冲击点火的研究有重要的科学意义。