针对大板坯的输送过程,基于铸坯的传热模型建立热弹塑性模型,研究不同输送方式条件下铸坯热应力分布的变化规律.研究表明,在辊道输送过程中,铸坯表面和心部分别受拉应力和压应力作用,在铸坯宽度方向上,距边部约0.23 m处拉应力最大,达到75 MPa,随着时间的延长,拉应力和压应力有减小趋势.在坑冷过程中,堆跺铸坯的中心区域和四周分别受压应力和拉应力作用,堆跺顶部和中心所受热应力的变化趋势都是先增大后减小.在堆冷过程中,堆冷铸坯顶部和中心处热应力分布及变化趋势与坑冷相似,但峰值更大,达到94 MPa.
As to the process of the slab conveying,the thermal elastoplastic model was established based on the heat transfer model of the slab.The thermal stress distribution of the slab were studied under the condition of different conveying ways.Results showed that the surface and center of the slab were effected by the tensile stress and compressive stress respectively in the process of roller conveying.The maximum tensile stress was 75 MPa at the place where is about 0.23 m from the edge in the width direction of the slab,and the thermal stress decreased with time.In the process of heat-preserved,the central area and the surrounding of stacking slabs were subjected to the compressive stress and tensile stress,respectively.The thermal stress first increased and then decreased in the top and the center of stacking slabs.In the process of stack cooling,the thermal stress distribution and the change tendency in the top and the center of stacking slabs were similar to that in the process of heat-preserved,but the peak value was up to 94 MPa.
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