冷轧带钢板形屈曲变形失稳限的有限元分析

采用ANSYS有限元仿真分析方法研究冷轧宽带钢板形屈曲失稳特性。利用ANSYS的几何非线性求解模块，建立宽薄带钢二维有限元模型，分析不同形式载荷、厚宽比和张应变下的屈曲失稳过程，计算板形屈曲变形失稳限。分析结果表明：边中复合浪的临界失稳载荷最大，中浪的较大，边浪的最小；边中复合浪的屈曲半波长为板宽的50％-60％，中浪与单边浪为80％左右，对称双边浪约为70％；在同样载荷下，随着厚宽比或张应变的增加，临界失稳限呈增长趋势，并且复杂浪形的临界失稳限增长速度明显大于简单浪形的增长速度。

Finite element analysis of shape buckling load for cold rolled strips

The behavior of the cold rolled strip buckling was studied using the ANSYS finite element method. Based on the geometrical non-linear solution module of the ANSYS, the two-dimensional finite element model was developed to analyze the process of buckling with the different kinds of loads, the different ratios of strip width to gauge and tensile strain. Then the buckling load was figured out. The results show that the biggest buckling load appears in the center buckle with edge wave, the smallest appears in the side long edge, and the long center ranks the middle. The half buckling wavelength of the center buckle with edge wave is 50%-60% of width, the long center and the single-side long edge is round 80%, the symmetrical dual-side long edge is about 70%. With the same kind of loads, the buckling load keeps growing while the ratio of strip width to gauge or the tensile strain increases, and the complex grows obviously faster than the simple one.