建立了结晶器内连铸坯热弹塑性应力有限元数学模型.在热弹塑性本构方程中考虑了材料力学性能、屈服函数随温度和应变速率的变化.着重研究了气隙对坯壳应力分布的影响.研究结果表明:当坯壳角部有明显的气隙形成时,铸坯偏角区成为热节区.在此热节区内,坯壳受到拉应力的作用,连铸坯有产生皮下裂纹的可能.
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