DNP基熔铸炸药的力学性能和失效准则  

Mechanical Properties and Failure Criteria of DNP-based Melt-cast Explosives

作　　者：徐跃跃 张向荣 高家乐 刘战伟[2] 苗飞超 刘攀 周霖[1] XU Yueyue;ZHANG Xiangrong;GAO Jiale;LIU Zhanwei;MIAO Feichao;LIU Pan;ZHOU Lin(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China;School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;School of Chemical and Blasting Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Chongqing Hongyu Precision Industry Group Co.,Ltd.,Chongqing 402760,China)

机构地区：[1]北京理工大学爆炸科学与安全防护全国重点实验室,北京100081 [2]北京理工大学宇航学院,北京100081 [3]安徽理工大学化学与爆破学院,安徽淮南232001 [4]重庆红宇精密工业集团有限公司,重庆402760

出　　处：《兵工学报》2024年第9期3114-3124,共11页Acta Armamentarii

基　　金：国家自然科学基金项目(11772060);安徽省自然科学基金项目(2208085QA27);安徽理工大学高层次引进人才科研启动基金资助项目(2021yjrc38)。

摘　　要：3,4-二硝基吡唑(3,4-dinitropyrazole,DNP)基熔铸炸药由于兼具高能量和高安全性,在含能材料领域具有广阔的应用前景,研究该炸药在不同应力状态下的力学性能和失效形式,将对其工程化提供理论和试验支撑。采用美国伊斯特朗(INSTRON)5965万能材料试验机、分离式霍普金森压杆对DNP基熔铸炸药典型配方进行准静态压缩力学性能、动态压缩力学性能以及准静态拉伸力学性能测试,分析添加剂(Cellulose Acetate Butyrate,CAB)含量、应变率等因素对力学性能的影响,研究DNP基熔铸炸药在准静态压缩、动态压缩和准静态巴西劈裂条件下的失效形式。研究结果表明:DNP基熔铸炸药的抗压强度整体随应变率的升高而增加;在准静态加载下,抗压强度随着添加剂含量的增加而降低,而在动态加载下则呈相反的变化趋势,当添加剂含量达到一定值时,熔铸炸药的抗拉强度显著提高;不同加载条件下DNP基熔铸炸药满足的强度失效准则不同,其中准静态压缩符合最大剪应力准则,动态压缩符合最大拉应变准则,巴西圆盘试验符合最大拉应力准则。3,4-dinitropyrazole(DNP)-based melt-cast explosive,characterized by its high energy content and enhanced safety,holds significant promise for applications in the field of energetic materials.Research into the mechanical properties and failure modes of this explosive under various stress conditions will provide essential theoretical and experimental support for its engineering applications.In this study,the quasi-static compressive mechanical properties,dynamic compressive mechanical properties,and quasi-static tensile mechanical properties of DNP-based melt-cast explosives are test using Instron 5965 universal materials testing machine and a split Hopkinson pressure bar.The influences of factors such as the content of additive(cellulose acetate butyrate)and strain rate on the mechanical properties are analyzed.The failure modes of DNP-based melt-cast explosives under quasi-static compression,dynamic compression,and quasi-static Brazilian splitting conditions are studied.The results demonstrate that the compressive strength of DNP-based melt-cast explosives generally increases with an increase in strain rate.The compressive strength decreases with an increase in the content of the additive under quasi-static loading,while it increases with an increase in the content of the additive underdynamic loading.A significant improvement in the tensile strength of melt-cast explosives is observed when the content of the additive reaches a certain threshold.Furthermore,the applicable strength failure criteria for DNP-based melt-cast explosives differ under different loading conditions,the quasi-static compression follows the maximum shear stress criterion,the dynamic compression adheres to the maximum tensile strain criterion,and the Brazilian disc test conforms to the maximum tensile stress criterion.

关 键 词：3 4-二硝基吡唑 熔铸炸药 力学性能 添加剂 强度失效准则 

分 类 号：O385[理学—流体力学] TJ012.4[理学—力学]