传爆药静态压缩力学性能及损伤特性研究  

Study on mechanical properties and damage characteristics of booster explosives under static compression

作　　者：肖向东 肖有才 洪志雄 熊言义 赵慧平 王泽宇 王志军[1] XIAO Xiangdong;XIAO Youcai;HONG Zhixiong;XIONG Yanyi;ZHAO Huiping;WANG Zeyu;WANG Zhijun(College of Mechatronic Engineering,North University of China,Taiyuan 030051,Shanxi,China;713th Research Institute of China State Shipbuilding Corporation,Zhengzhou 450015,Henan,China)

机构地区：[1]中北大学机电工程学院,山西太原030051 [2]中国船舶重工集团公司第七一三研究所,河南郑州450015

出　　处：《爆炸与冲击》2022年第4期70-76,共7页Explosion and Shock Waves

基　　金：国家自然科学基金(11802273);山西省青年科学基金(201901D211279)。

摘　　要：为研究聚黑-14C(JH-14C)传爆药静态压缩力学性能及损伤特性,开展准静态压缩实验,获得了不同应变率下的应力-应变曲线,建立了描述不同应变率下JH-14C力学行为的非线性本构模型;利用扫描电镜(SEM)对回收试样进行细微形貌观测,获得了准静态压缩JH-14C损伤特性的表征。结果表明:JH-14C压缩强度随应变率的升高而提高;实验与计算结果对照验证了本构模型的有效性;准静态压缩实验中,JH-14C主要损伤模式为脱湿和穿晶断裂。In order to study the static compression mechanical properties and damage characteristics of the JH-14C booster explosive,quasi-static compressive experiments were performed on a testing machine equipped with an environmental chamber(INSTRON).According to the GJB 770B–2005 powder test method,dimensions of the cylindrical specimen were set as φ12.5 mm×12.5 mm in the static compressive experiments.During compression,only one extensometer was used.All experiments were performed at a crosshead speed of 0.0125,0.0625,0.125,0.625 and 1.25 mm/s at room temperature(25℃),which led to a nominal strain rate of 0.001,0.005,0.01,0.05 and 0.1 s^(−1),respectively.The average stress-strain values and standard deviations were calculated using five replicable experiments for each condition.The experimental results were compared with X0242 and PBX-9501,and the mechanical properties of JH-14C were analyzed.According to the mechanical properties of JH-14C at low strain rates,the original Ramberg-Osgood constitutive relationship was modified,and a nonlinear constitutive model including the strain rate term was established to describe the mechanical behavior of JH-14C at low strain rates.The micro morphologies of the recovered samples was observed by a scanning electron microscope(SEM)and compared with that of PBX-9501.The damage mode was analyzed to characterize the damage characteristics of JH-14C under quasi-static compression.The results show that the compressive strength of JH-14C increases with the increase of strain rate.The validity of the constitutive model was verified by comparing the experimental and calculated results.In the quasi-static compression experiments,the energetic particles and the binder were debonded.With the increase of the pressure,the original crack and the micro-crack formed by debonding on the energetic particles were converged and coalesced to form a macro crack,which led to the rupture and failure of the explosive.

关 键 词：JH-14C 传爆药 准静态 应变率 本构模型 损伤模式 

分 类 号：O347.3[理学—固体力学]