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为评估高炉铜冷却壁工作时的热应力分布,先对铜材料进行高温拉伸试验,获得不同温度下铜的弹性模量,为铜冷却壁热力耦合数值分析提供了基础数据。通过对高炉的整体分析,得到各段铜冷却壁的位移。在此基础上计算自由膨胀时各段联络管的位移,考虑相互连接情况,最终计算得到实际工作时铜冷却壁的温度及应力分布。热膨胀导致铜冷却壁产生的热应力小于材料屈服强度,但挤压造成水管根部平均应力上升会导致疲劳失效。
In order to evaluate the distribution of thermal stress during the operation of BF stave, high temperature tensile test was conducted on the copper material to obtain the modulus of elasticity of copper at different temperatures, which provided the basic data for the numerical analysis of thermal coupling of copper stave. Through the overall analysis of the blast furnace, the displacement of each section of the stave is obtained. On this basis, the displacements of each section of the connecting pipe during free expansion are calculated. Considering the interconnection, the temperature and stress distribution of the copper stave are calculated finally. The thermal stress caused by the thermal expansion of the copper stave is less than the yield strength of the material, but the increase of the average stress at the root of the water pipe caused by the extrusion will lead to fatigue failure.