B炸药慢速烤燃过程的流变特性

为进一步探究熔铸炸药在烤燃过程中内部各物理场的变化情况，以B炸药为研究对象，完整地建立了基于Bingham流体模型的B炸药黏度计算模型并应用于慢速烤燃的数值模拟。通过数值模拟得到了B炸药在整个升温过程中上中下3个内部测点处的温度变化曲线并以烤燃试验加以验证，观察了弹体内部温度场与对流场的变化特点。结果表明:升温速率为1 ℃/min时，B炸药相变后逐渐开始流动，内部的温度场分布也随之改变，炸药出现自热反应与最终响应的区域都在弹体上部；升温速率为0.055 ℃/min时，炸药相变后内部很长时间内仍表现出类固相温度场的分布特点，当炸药出现自热反应后，才逐渐开始流动，温度场也逐渐转变为典型的液相温度场，炸药最终响应点在弹体上部，但最早出现自热反应的区域在弹体中心。

Rheological properties of Composition B in slow cook-off process

In order to investigate the changes of the internal physical fields of melt-castable explosives in cook-off, Composition B was chosen as the object. A complete viscosity model of Composition B based on the Bingham flow model was first established, and then applied in the numerical simulations of slow cook-off. In this way, the temperature curves of three inner measuring pointsthat located in the upper, middle and lower respectively were obtained and further testified with cook-off experimental measurements. Moreover, the variation of the inner temperature field in the whole process was observed as well. The results showed that when the heating rate was 1 ℃/min, the viscosity flow of Composition B appeared soon after the phase change, and the inner temperature field changed with that. The self-heating and ignition occurred in the upside area of the shell. But when the heating rate was 0.055 ℃/min, the inner temperature field was still like a solid phase after the phase change was completely done for a long time, and the viscosity flow appeared after the self-heating started, the inner temperature field gradually began to change like a liquid phase just at that time. The ignition area was in the upside of the shell too, but the self-heating area was in the middle of the shell. The contradictory points of view in previous studies can be preliminarily explained by this model.