基于初始温差的高强钢板层冷过程前屈曲分析

 高强钢板在进入层流冷却前，因其宽度方向上的中部和边部初始温差过大，导致层流冷却后钢板出现双边浪缺陷。针对此问题，通过试验测量不同初始温差钢板层流冷却后长度方向的残余应力，以测量的残余应力作为边界条件，建立了钢板稳定性分析模型，运用解析方法求解出钢板屈曲失稳的临界残余应力。将试验测量的残余应力最大值和初始温差进行拟合，根据钢板屈曲失稳的临界残余应力求出临界初始温差约为40 ℃，这对高强钢板的生产有切实的指导作用。

Influence of initial temperature difference on high strength strip buckling in laminar cooling

Because of bilateral wave on high strength strip after laminar cooling for high temperature difference be-tween edge and central area,initial temperature difference experimental devices were built up to measure residual stress in the length direction under different conditions. Then,the model of strip stability analysis was built,and analytical method was used to calculate the critical residual stress when the buckling of strip happens. According to the critical re-sidual stress and fit result of initial temperature difference and residual stress,the critical initial temperature difference was calculated,which is 40℃and the result is important to guide the production.