Forming limit of stainless steel-clad aluminium sheets under plane stress condition
Forming limit of stainless steel-clad aluminium sheets under plane stress condition
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DOI：
10.1016/s0924-0136(96)02601-5
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发表时间：
1997
影响因子：
6.3
通讯作者：
F. Yoshida;R. Hino
中科院分区：
文献类型：
--
作者：
F. Yoshida;R. Hino
研究了双向应力条件下金属板料层合板的成形极限。基于Hill的局部颈缩理论，导出了负应变比条件下（β=ε2/ε1 <$0，ε1为主应变，ε2为小应变）层合板局部颈缩的判据。对于双轴拉伸（β=ε2ε1>0），采用修正的Marciniak-Kuczyelski型分析，假设板的凹槽中存在初始不均匀性增长。计算的成形极限图（FLD）进行了比较与相应的实验结果确定的冲压拉伸实验上的两个和三层不锈钢复合铝板。无论是在分析预测和实验观察，层压板的FLD之间的那些他们的组成金属板。讨论了在轧制过程中产生的预应变对成形性的影响。
The forming limit of sheet metal laminates under biaxial stress conditions is investigated. A criterion of localized necking for the laminates, in the negative strain-ratio condition (β=ε2/ε1≦0, ε1: major strain and ε2: minor strain), is derived based on Hill's theory of localized necking. For biaxial stretching (β=ε2ε1>0), a modified Marciniak-Kuczyński-type analysis, which assumes that an initial inhomogeneity growth in the groove of the sheet. The calculated forming limit diagrams (FLD) are compared with the corresponding experimental results determined by punch-stretching experiments on two- and three-ply stainless steel-clad aluminium sheets. Both in the analytical predictions and the experimental observations, the FLDs of the laminates lie between those of their component sheet metals. The effect of prestrain generated in the roll-bonding process on the formability is discussed.