连铸板坯矫直过程应力应变的有限元模拟

采用弹塑性有限元分析法,对拉速1.0m/min、厚度230mm的板坯,在3套不同的辊列布置的单点矫直、四点矫直、连续矫直进行应力应变的有限元模拟。结果表明:铸坯等效VonMises应力值和铸坯水平方向应力按单点矫直、四点矫直、连续矫直依次减小;与单点矫直相比,四点矫直减小了每次矫直的变形量和应变速率;连续矫直时,在变形区内等效应变沿长度方向呈线性变化,最大值为1.11%,等效塑性应变速率较低,约为5.5×10^-5s^-1,其应变速率最低,是比较理想的矫直方式。

Finite Element Simulation of Stress and Strain of Concasting Slab during Straightening

The finite element simulation of stress and strain of 230 mm slab with casting rate 1.0 m/min and 3 different roller ways layout-single-point,four-point and continuous straightening have been carried out by elastoplastic finite element method. The results showed that the equivalent Von Mises stress and horizontal stress of slab decreased in turn in single-point,four-point and continuous straightening; compared with single-point straightening,the each point straightening stress and strain rate decreases obviously in four-point straightening; and in continuous straightening,the equivalent plastic strain changes linearly in deformation area up to maximum value 1. 11% with lower equivalent plastic strain rate-about 5.5×10^-5s^-1,its strain rate is minimum,it is a ideal straightening process.