【摘要】 高能炸药材料普遍具有脆性特点,对其增韧改性有助于提高武器安全性及可靠性,因此炸药韧性的表征是亟待解决的问题。针对其他工程材料常用的两种参量(冲击韧性、断裂韧性)表征炸药韧性时存在的局限性,提出了基于应力-应变曲线断裂能量计算的韧性表征参量——断裂能,包括拉伸断裂能和压缩断裂能两种形式。一方面,由于不能测试炸药冲击韧性,从测试原理上分析了断裂能参量与冲击韧性具有比较接近的物理意义;另一方面,试验比较了室温下三种炸药之间(HMX-P1、HMX-P2、TATB-P3)和其中一种炸药(HMX-P2)在不同温度下(20,35,45,60℃)的断裂能与断裂韧性的变化趋势,结果表明,不同炸药之间以及不同温度下炸药的断裂能与断裂韧性的变化趋势具有较好的一致性;基于这两方面的对比分析,认为断裂能可以作为炸药材料的一种韧性表征参量。更多还原

【Abstract】 The impact toughness( Ak) and the fracture toughness(KⅠC) are main parameters to characterize the fracture toughness of the engineering materials. In order to solve the the limits of Akand KⅠC in characterization of explosive fracture toughness,the tensile fracture energy Wt and the compress fracture energy Wcbased on the stress-strain curve were put forward. The similarity between the physical meanings of the fracture energy parameters( Wt,Wc)and the impact toughness Ak,was found via analyzing the test principle although they could not be directly measured. Wt,Wcand KⅠ Cfor different explosives HMX-P1,HMX-P2,TATB-P3 at roomtemperature were studied by experiments as well as for HMX-P2 at 20,35,45 ℃ and 60 ℃. Results showthat the Wt,Wcand KⅠ Cof explosives have the same change trend whether for different type explosives or at different temperatures,which indicates they can be used to characterize the toughness of explosive materials.更多还原