摘要
有限元仿真中,凸模与板料接触力出现峰值的时刻,板料上变薄量最大单元的邻近单元应变即是材料的缩颈极限应变,通过改变试件形状及尺寸就可以得到在不同应变状态下的缩颈极限应变。把这些极限应变点在二维应变空间里连成曲线,即为用有限元仿真方法得到的材料成形极限图(forming limits diagram,简称为FLD)。用该方法得到的FLD与按照GB/T15825.8—1995金属薄板成形性能与试验方法:成形极限图(FLD)试验利用半球形凸模拉伸试件测得的材料FLD符合程度良好。
In the finite element simulation, when the pressure between the punch and blank rise to peak, strain of the thinnest element in the blank is the necking limit . Different rate of forming limit strain can be got from different size and shape of specimen. Plot all the limit point in the diagram and connect them to a curve then the forming limit diagram can be gotten. The forming limit diagram of 08AL got in this way is good tallied with the experimental forming limit diagram.
出处
《机械制造与自动化》
2005年第3期74-76,共3页
Machine Building & Automation
关键词
板料成形
成形极限图
HILL集中失稳理论
有限元仿真
sheet metal forming
forming limit diagram(FLD)
HILL localized necking theory
finite element method
