The large strain flow curve is an essential input for the calibration of a myriad of plasticity models required for accurately simulating sheet metal forming processes and the mechanical performance of formed components. Studies on large strain flow curve identification can be divided in three main categories. The first class of experiments generate statically determinate stress states which unambiguously correlate analytically to the external load and measured strains, hence enable a direct measurement of the large strain flow curve. The second category relies on the intermittently measured flow stress using pre-strained samples to construct the large strain flow curve. The third category consists of methods that minimize the discrepancy between the experimentally acquired and the numerically computed measurand to inversely identify a chosen hardening law representing the large strain flow curve. The paper presents an overview of the state-of-the-art methods to acquire the large strain flow curve of sheet metal. A selected number of methods are reviewed and recent developments are discussed in detail. Finally, an objective assessment of the selected methods is pursued by applying them to a DP600 steel sheet.

大应变流动曲线是校准精确模拟钣金成形过程和成形部件的机械性能所需的无数塑性模型的重要输入。大应变流动曲线识别的研究可分为三大类。第一类实验产生静态确定的应力状态，其在分析上明确地与外部载荷和测量的应变相关，因此能够直接测量大应变流动曲线。第二类依赖于使用预应变样品间歇测量的流动应力来构建大应变流动曲线。第三类包括将实验获得的和数值计算的被测量之间的差异最小化的方法，以反向识别代表大应变流动曲线的选定硬化定律。本文概述了获取钣金大应变流动曲线的最新方法。回顾了一些选定的方法，并详细讨论了最近的发展。最后，通过将所选方法应用于 DP600 钢板来进行客观评估。