DNAN 基高固含量熔铸炸药力学性能研究

为了解2,4-二硝基苯甲醚(DNAN)基高固含量熔铸炸药(20%DNAN/15%HMX/32.5%NTO/31%Al/1.5% 功能助剂，固含量78.5%)的动态力学性能，对其进行分析。使用万能材料试验机及分离式霍普金森杆(split Hopkinson pressure bar，SHPB)对DNAN 基熔铸炸药样品进行准静态与动态加载，获取炸药样品在准静态加载与动态加载条件 下的应力应变曲线；依据应力应变曲线，标定炸药的Maxwell 模型参数，并通过数值仿真对模型及标定参数进行验 证。验证结果表明：DNAN 基熔铸炸药失效应变低于1.6%，脆性大，随着加载应变率增大，材料失效应力随之增加， 机械响应应变率相关；Maxwell 模型标定参数准确，能较好地反映炸药在不同应变率加载下的力学性能。

Study on Mechanical Properties of DNAN-based High Solid Content Melt-cast Explosive

In order to understand the dynamic mechanical properties of DNAN-based high solid content melt-cast explosive (20% DNAN/15% HMX/32.5% NTO/31% Al/1.5% functional additives, solid content 78.5%), the dynamic mechanical properties were analyzed. The stress-strain curves of DNAN-based melt-cast explosive samples under quasi-static and dynamic loading conditions were obtained by using universal material testing machine and split Hopkinson pressure bar (SHPB). The Maxwell model parameters of explosive were calibrated, and the model and calibration parameters were verified by numerical simulation. The results show that the failure strain of DNAN-based melt-cast explosive is less than 1.6 %, and the brittleness of DNAN-based melt-cast explosive is high. With the increase of loading strain rate, the failure stress increases, and the mechanical response is related to strain rate. The Maxwell model calibration parameters are accurate, and can better reflect the mechanical properties of explosives under different strain rates.