用两种不同的双拉成形技术获取成形极限曲线。
Forming Limit curves (FLCS) are constructed by two different kinds of shrinking methods in the paper.
描述包装产品的破损极限曲线，必须借助冲击机进行冲击试验。
The damage boundary curve of packed products could be described with the help of the shock test by impact machine.
试验结果表明：加载应变路径的变化会影响成形极限曲线的高低。
It is shown that the change of loading strain path will affect the forming limit curve.
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