中文摘要：

从普适的热力学原理出发，研究了升华能随温度和压力的变化。结果表明，升华能随温度或压力的增加而线性减小。采用光滑粒子流体动力学方法对金属铝在脉冲X射线辐照下的汽化反冲冲量进行了数值模拟，考察了升华能的变化对冲量的影响。结果表明，考虑升华能随温度和压力的变化后，冲量明显增加。

英文摘要：

The dependence of the sublimation energy on temperature and pressure was studied based on universal thermodynamics. The result shows that the sublimation energy decreases linearly with the increasing temperature or pressure. The blow-off impulse of aluminum induced by pulsed X-ray was simulated by smoothed particle hydrodynamics （SPH） method, and the influence of sublimation energy on impulse was discussed. In contrast to the situation that sublimation energy is a constant, the numerical result shows that the blow-off impulse of aluminum will increase obviously if the change of sublimation energy with temperature and pressure is considered.