水下爆炸离心机试验中爆炸荷载的缩比关系研究

水下爆炸原型试验受到场地环境等多种因素的制约，离心机缩比试验为研究结构在水下爆炸作用下的破坏提供了新的思路。离心机缩比模型试验通过放大一定倍数的加速度对模型进行缩比，同时模型在几何布局上缩小相应的比例达到与原型试验的几何相似。文章首先建立80kgTNT装药水下爆炸数值模型，并将计算结果与原型试验进行对比，确定合理的比例爆距观测点，验证模型可靠性，继而采用相同的材料参数与建模方式建立1gRDX装药(等效1.62gTNT装药)在不同离心加速度条件下的水下爆炸缩比试验数值模型，并将计算结果与离心机试验结果进行对比，讨论相似率在水下爆炸离心机缩比试验中的应用，研究不同的物理量在离心机试验中的缩比关系以及附加离心加速度对缩比试验中水下爆炸动态荷载的影响。

Study on load scaling relationship in centrifuge test of underwater explosion

The prototype test of underwater explosion is restricted by many factors, such as site environment, etc-Centrifuge test of scale model provides a new idea of studying the damage of structures due to underwater explosion. In centrifuge test of scale model, the model is scaled by multiplying the acceleration with a certain magnification factor, and at the same time, the geometric layout of the model is reduced by the corresponding scale to achieve the geometric similarity with the prototype test. In this work, the numerical model of underwater explosion of 80kgTNT is established firstly, and the calculated results are compared with those of the prototype test, so that the reasonable observation point of proportional explosion distance is determined and the reliability of the model is validated. Then, the numerical model of underwater explosion scale test of 1g RDX charge (equivalent to 1.62g TNT charge) under different centrifugal acceleration conditions is established by using the same material parameters and modeling method, and the calculated results are compared with centrifuge test results. Furthermore, the application of similarity ratio to centrifuge scale test of underwater explosion is discussed, and the scaling relationship of different physical quantities in centrifuge test and the influence of additional centrifugal acceleration on dynamic load of underwater explosion in scaling test are studied.