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狭缝规格对透气砖热机械应力的影响

Keywords: 透气砖,狭缝,规格,热机械应力,有限单元法

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Abstract:

为延长透气砖的使用寿命,对其热机械应力场进行了模拟分析,确定了狭缝的合理规格.首先根据透气砖工作特点及研究目的,在适当简化结构和边界条件的基础上,建立了二维平面应变有限元模型.然后在保持透气砖规格和狭缝分布形式一定的前提下,研究了狭缝尺寸和数量变化对透气砖热机械应力场的影响.研究结果表明,透气砖的高应力区集中于狭缝端部很小范围,应力变化较大的区域位于狭缝四周.缩短狭缝长度可降低透气砖的整体热机械应力;有限增大狭缝宽度可以降低狭缝端部热应力;增加狭缝数量可以降低其端部热应力,但会造成透气砖其他区域热应力的增大.

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