透气砖稳态热梯度应力场的数值模拟

Numerical Simulation on Steady-state Thermal Gradient Stress Fields of Purging Plug

根据钢包用透气砖的特点,通过对其结构和边界条件进行适当简化,建立了它的二维平面应变有限元模型。然后在考虑钢包换热系数和所涉及材料物理性能参数随温度变化的情况下,对透气砖稳态热梯度应力场进行了数值模拟,并研究了其结构对应力场的影响。结果表明:当透气砖处于热稳定状态时,其底面中心部位的拉应力最大,底部侧面的压应力最大,但其上半部的热梯度应力要小得多;透气砖长度的缩短、底角的减小和直径的增加,均会使其热梯度应力增大。

Based on the properties of purging plug used in ladle,its two-dimensional plane strain finite element model was built by simplifying its structure and boundary conditions.Then the purging plug＇s steady-state thermal gradient stress fields were simulated,and the influence of structure to its stress fields was also studied.In the simulation,the change of heat convection-radiation coefficient of the ladle and the physical parameters of the materials related with temperature were taken into account.The results shown that the maximum tensive stress is in the center of its bottom,and the maximum compressive stress is on the side of its basal part,but the thermal gradient stress of its top semi-partial is much lower,and with the purging plug＇s length＇s shortening,bottom angle＇s decreasing and diameter＇s increasing,its thermal gradient stress increases when the purging plug is in an thermal steady-state.