冲击载荷作用下典型发射药的弹性模量分析方法  

Analysis Method for Elastic Modulus of Typical Gun-propellant under Impact Loading

作　　者：刘计划 赵宏立[1] 何昌辉 靳建伟[1] 张邹邹[1] 王琼林[1] 赵宝明[1] LIU Jihua;ZHAO Hongli;HE Changhui;JIN Jianwei;ZHANG Zouzou;WANG Qionglin;ZHAO Baoming(Xi an Modern Chemistry Research Institute,Xi an 710065,Shaanxi,China)

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《兵工学报》2021年第2期289-296,共8页Acta Armamentarii

摘　　要：为获得冲击载荷作用下典型发射药弹性模量有效分析方法,进行了落锤冲击发射药的实验研究。结合高速摄像技术和数字图像相关方法,得出发射药在落锤冲击过程中的应力与应变曲线;以此为基础,采取线弹性、非线性弹性和黏弹性3种分析手段,得到DAGR125-21/19发射药在常温和低温下弹性模量随着冲击速度和冲击能量的变化规律。结果表明:随着冲击速度增加,发射药在常温和低温下弹性模量变化较小,其中黏弹性分析得到的弹性模量最小,线弹性和非线性弹性分析的结果相近,且低温下弹性模量远大于常温下弹性模量;通过对双芳-3双基发射药弹性模量的研究,可以得到相似的结论,且常温下双芳-3双基发射药弹性模量与DAGR125-21/19发射药弹性模量相当,但低温下前者远大于后者;基于数字图像相关方法的黏弹性分析,可以获得准确可靠的发射药弹性模量。The experimental research on drop hammer impacting of gun-propellant was made to obtain an effective analysis method for the elastic modulus of typical gun-propellant under impact loading.The stress and strain curves of gun-propellant during drop hammer impact test were obtained through high-speed photography and digital image correlation method.On this basis,the linear-elastic,nonlinear-elastic and viscoelastic analysis methods are used to get the change laws of elastic modulus of DAGR125-21/19 with impact energy and velocity at normal and low temperatures.The results show that the elastic modulus of gun-propellant changes slightly at normal and low temperatures with the increase in the impact velocity.Furthermore,the magnitude of elastic modulus from viscoelastic analysis is least,the results from linear elastic analysis are close to those from nonlinear elastic analysis,and the elastic modulus of gun-propellant at low temperature is much greater than that at normal temperature.The elastic modulus of SF-3 double-base gun-propellant was studied.It is found that the elastic modulus of SF-3 double-base gun-propellant is equivalent to that of DAGR125-21/19 at normal temperature,but the elastic modulus of the former is much bigger than that of the latter at low temperature.The reliable and accurate elastic modulus of gun-propellant can be derived by using viscoelastic analysis based on digital image correlation method.

关 键 词：发射药 落锤冲击 弹性模量 数字图像相关方法 

分 类 号：O343.5[理学—固体力学] TJ55[理学—力学]