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为延长透气砖的使用寿命,对其吹氩引起的热梯度应力场进行了模拟分析,以确定狭缝在其截面上的合理位置。首先根据透气砖工作特点和研究目的,在适当简化其结构和边界条件的基础上,建立了它的二维平面应变有限元模型。然后在保持狭缝规格一定的前提下(0.20 mm×20 mm×24),研究了其相对位置对透气砖热梯度应力场的影响。研究结果表明:1)透气砖中心为等应力区,高应力则区位于狭缝周围;2)狭缝径向位置对透气砖最大热应力的影响不大;3)对于本次分析,当狭缝径向位置为5~10 mm、透气砖直径为140 mm、狭缝偏转角度为30°~45°时,透气砖的热梯度应力较低。
In order to prolong the service life of the breathable brick, the thermal gradient stress field caused by argon blowing was simulated to determine the reasonable position of the slit in its cross section. First of all, based on the characteristics and research purposes of the ventilation brick, a two-dimensional plane strain finite element model of the brick was established based on the simplified structure and boundary conditions. Then the influence of the relative position on the thermal gradient stress field of the brick was studied under the premise of certain slit size (0.20 mm × 20 mm × 24). The results show that: 1) the center of the brick is equal stress zone, and the high stress area is located around the slit; 2) the radial position of the slit has little effect on the maximum thermal stress of the brick; 3) For this analysis, When the radial position is 5 ~ 10 mm, the diameter of the ventilation brick is 140 mm, and the deflection angle of the slit is 30 ° ~ 45 °, the thermal gradient stress of the breathable brick is lower.