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根据实验测量得到的钢靶表面能量耦合系数随温度的变化规律,考虑金属材料的物性参数随温度的变化及表面发生的熔凝过程,建立了连续激光作用下金属/炸药结构内部三维温度场分布的有限元计算模型,分析了金属壳体厚度对计算结果的影响及炸药热爆炸的可能性。计算结果表明,金属壳体越厚,炸药能够获得的温升越小,其热引爆也就越发困难。在有限的辐照时间内,炸药仅在与金属接触的一个小区域内温升明显,其他部分温升不大,停止激光辐照后,由于结构内部有温度梯度存在,会继续发生热传导,使得整个结构朝着热平衡的方向发展,从而对炸药的温升有利。
Based on the experimentally measured energy coupling coefficient of steel target surface with temperature, considering the change of physical property parameters of metal material with temperature and the surface melting process, the three-dimensional temperature field distribution of metal / explosive structure under continuous laser was established The finite element calculation model was used to analyze the influence of the thickness of the metal shell on the calculation results and the possibility of explosive thermal explosion. The calculation results show that the thicker the metal shell, the smaller the temperature rise the explosive can obtain, and the more difficult it is for the thermal detonation. Within a limited irradiation time, the explosives only have a significant temperature rise in a small area in contact with the metal, and have little temperature rise in other parts. After the laser irradiation is stopped, the heat conduction will continue due to the temperature gradient inside the structure, so that the whole The structure is moving in the direction of thermal equilibrium, thus benefiting the temperature rise of the explosives.