内部爆炸薄圆板的变形及有效载荷

Deformation and payload of thin circular plates subjected to internal explosion

为了研究内爆炸薄圆板的失效与作用载荷特性,在双圆筒装置内开展了铝质、钢质薄圆板内爆炸实验,分析了圆板破坏模式及比冲量载荷特性,并基于相同变形下载荷相等原理,得到了钢质圆板极限变形下的有效比冲量及作用时间,提出了该工况下圆板变形的预估模型。结果表明:在内爆炸载荷作用下,薄圆板的夹持边界和几何中心是应力集中区,产生了塑性大变形、拉伸撕裂、剪切断裂3种破坏模式;圆板的比冲量载荷由初始的波浪式增长逐渐转化为线性增长,30~80 g某温压装药使1 mm厚钢质圆板产生极限变形的有效比冲量作用时间在2.26~2.93 ms之间,经验证,圆钢板变形预估模型得到的装药质量与实验装药质量偏差小于13.3%。

In order to study the relationship between the failure and action loading characteristics of thin circular plates subjected to internal explosion,the experiments on aluminum and steel thin circular plates were carried out in a doublecylinder device.The failure modes and the specific impulse characteristics of the circular plates were analyzed.Based on the principle of equal loading under the same deformation,the effective specific impulse and action time under the ultimate deformation of the circular plate were obtained,and the prediction model of the circular plate deformation under this condition was proposed.The results show that,under the action of internal explosion load,the stress concentration zone is the boundary and geometric center of the thin circular plate,which leads to the failure mode of large plastic deformation,tensile tear and shear fracture.The specific impulse on the circular plate gradually changes from the initial wave growth to linear growth,and the effective specific impulse action time is in the range of 2.26–2.93 ms for a certain thermobaric explosive charge of 30–80 g making the steel circular plate with the thickness of 1 mm produce the ultimate deformation.The empirical results show that the deviation between the charge mass obtained by the prediction model and the experimental charge mass is less than 13.3%.