球形爆炸容器应变增长现象的极限情况

Limit of strain growth in a spherical explosion vessel

应变增长现象威胁容器安全,研究应变增长现象的极限情况对爆炸容器的安全应用非常重要。本文中开展了球形容器爆炸加载实验,获得了应变增长系数达到6.1的应变数据,并利用数值模拟分析球壳弹性变形范围内振动模态叠加形成的应变增长现象的极限情况。研究表明:(1)应变增长现象符合几何相似律,影响应变增长的因素包括扰动源类型、扰动源半径与球壳半径之比、球壳厚度与球壳半径之比、第一个应变峰等,其中扰动源参数是主要影响因素。(2)当扰动源位移被完全约束、扰动源半径等于球壳半径时,球壳上可能的应变增长系数接近12。

As the strain growth poses a potential hazard for the safety of an explosion vessel,it is of great importance to figure out its limit. The experiment,which was carried out in a spherical explosion vessel,shows that the maximum strain growth factor is up to 6.1. Numerical simulation was conducted to analyze the limit of the strain growth induced by the superposition of different vibration modes in the spherical vessel with elastic deformation. The following conclusions were reached： First,the strain growth phenomenon obeys the law of geometric similarity. The strain growth factor is related to the perturbation type,the ratio of the perturbation radius to the spherical shell radius,the ratio of the spherical shell thickness to the spherical shell radius,the first strain peak and so on. The perturbation type and the ratio of the perturbation radius to the spherical shell radius are the main influencing factors. Second,the largest strain growth factor is up to 12 when the perturbation is fully constrained and the perturbation radius is equal to the spherical shell radius.