中文摘要：

在冷轧过程中,带钢边部容易发生裂纹扩展,严重会造成断带事故,所以预测带钢边部裂纹扩展从而避免断带能够提升生产效率以及产品最终质量,因此,预测方法极为重要。本次研究运用扩展有限元（Extended finite element method,XFEM）模型对边部含有预置缺陷的带钢在冷轧过程中裂纹扩展行为进行预测,采用弹塑性有限元模拟和薄板拉伸试验混合技术以及多试样法断裂韧度试验确定最大主应力准则两个参数,并验证了参数的准确性。采用有限元模拟与冷轧试验对比,通过改变轧制参数,证明XFEM模型对边部含有预置缺陷的带钢在冷轧过程中裂纹扩展行为有很好的预测能力。本次研究还模拟分析压下率以及前、后张力对冷轧过程带钢边部裂纹扩展的影响,结果表明前张力影响效果更明显,同时,压下率越大,裂纹张开位移和裂纹扩展越明显。

英文摘要：

In the cold rolling process, the steel sheet edge easily generates crack propagation, even can cause strip rupture. Thus, predicting edge crack of steel sheet propagation can avoid strip rupture and improve production efficiency and quality, so that the prediction method is extremely important. The extended finite element method（XFEM） model is used to predict the edge crack of steel sheet propagation in the cold rolling process. The two parameters of maximum principle stress criterion（MAXPS） are determined by hybrid technique of elastoplastic finite element method simulation and thin-plate tension test and multiple specimens fracture toughness test, and the accuracy of the two parameters is verified. Comparison of simulation and experiment by changing cold rolling parameters, the results showed that the XFEM model has good prediction ability on crack propagation behavior with edge defect pre-set in the steel sheet in the cold rolling process. Meanwhile, in this research, the effect of different reduction ratios, front and back tension to edge crack propagation are analyzed in the cold rolling process, and the results showed that the front tension effect is more obvious than the back tension. Meanwhile, along with the reduction ratio increase, the crack opening displacement and crack propagation were more obvious.