摘要
以AA5182铝合金两次非线性加载的应变极限变化为研究对象,考虑板材的各向异性,分别进行了不同轧制方向的单向拉伸预变形和等双向拉伸预变形,并测定了材料在二次非线性加载路径下基于应变的成形极限曲线(FLC)。结果表明,基于应变的FLC与加载路径相关,FLC形状随加载路径变化;将测定的应变值经数值变换,获得了基于应力的成形极限图(FLSD)和基于极坐标等效塑性应变成形极限图模型(PEPS-FLD)。通过不同的加载路径,验证了两种极限模型均可以描述复杂加载条件下的成形极限预测。FLSD和PEPS-FLD模型具有路径无关性,不同应变路径下的曲线接近重合。
Taking the strain limit changes of AA5182 aluminum alloy under two nonlinear loading as the research objects,and considering the anisotropy of the sheet metal,the unidirectional and bidirectional tensile predeformation in different rolling directions were carried out,respectively,and the strain-based forming limit curve(FLC)of the material under quadratic nonlinear loading path was measured.The results show that the strain-based FLC is related to the loading path,and the shape of FLC varies with loading path.The forming limit stress-based diagram(FLSD)and the polar-based effective plastic strain forming limit diagrams(PEPS-FLD)model were obtained by numerical transformation of the measured strain values.Both the limit models can describe the forming limit prediction under complex loading conditions through different loading paths.The FLSD and PEPS-FLD models are path independent,and the curves under different strain paths are close to overlap.
作者
王成勇
王勇
王冬艳
薛妮妮
WANG Cheng-yong;WANG Yong;WANG Dong-yan;XUE Ni-ni(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第10期129-134,共6页
Journal of Plasticity Engineering
基金
合肥工业大学大学生创新训练计划项目(X202210359059)。
关键词
成形极限
预变形
各向异性
铝合金
forming limit
predeformation
anisotropy
aluminum alloy