Abstract The forming process of sheet metal is a complicated procedure relating to tensile and compressive plastic deformation. The in-plane tensile-compressive test is a main way to understand the plastic behavior under the complicated loading paths. In this paper, a new device is developed to realize in-plane tensile-compressive tests in order to study the plastic behavior during tension and compression of sheet metal. The newly-developed device has the advantages of high efficiency and low cost. It can support a reliable continuous, large-strain tensile-compressive test for more materials with higher strength based on any common universal testing machine. A set of friction-counteracting supporting mechanism including T-shaped supporting plates, Teflon sheets and upper/lower fixtures is designed to prevent buckling deformation of sheet metal during compression. Moreover, the tensile-compressive tests of DP780 steel are conducted by using the new device to obtain the tensile-compressive stress-strain curve reflecting the Bauschinger behavior. The constitutive model of DP780 steel is established and the optimal model parameters are achieved for the simulation analysis. As a result, the simulated tensile-compressive curves match the experimental curves very well. The newly-developed device is favorable to accurately describe the plastic behavior under the complicated loading paths during forming and contribute to precise simulation analysis.

中文翻译：

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一种新型大应变抗摩擦抗屈曲支撑机构连续拉压试验装置

摘要 钣金成形过程是一个复杂的过程，涉及拉伸和压缩塑性变形。面内拉压试验是了解复杂加载路径下塑性行为的主要途径。在本文中，为了研究金属板在拉伸和压缩过程中的塑性行为，开发了一种新装置来实现面内拉伸-压缩试验。新开发的装置具有效率高、成本低的优点。它可以支持在任何普通万能试验机的基础上对更多强度更高的材料进行可靠的连续大应变拉压试验。一套减摩支撑机构，包括T形支撑板，特氟龙板和上/下夹具旨在防止金属板在压缩过程中发生屈曲变形。此外，利用新装置对DP780钢进行拉压试验，得到反映包辛格行为的拉压应力-应变曲线。建立了DP780钢的本构模型，得到了最优的模型参数进行仿真分析。因此，模拟的拉伸-压缩曲线与实验曲线非常吻合。新开发的装置有利于准确描述成形过程中复杂加载路径下的塑性行为，有助于精确的模拟分析。采用新装置对DP780钢进行拉压试验，得到反映包辛格行为的拉压应力-应变曲线。建立了DP780钢的本构模型，得到了最优的模型参数进行仿真分析。因此，模拟的拉伸-压缩曲线与实验曲线非常吻合。新开发的装置有利于准确描述成形过程中复杂加载路径下的塑性行为，有助于精确的模拟分析。采用新装置对DP780钢进行拉压试验，得到反映包辛格行为的拉压应力-应变曲线。建立了DP780钢的本构模型，得到了最优的模型参数进行仿真分析。因此，模拟的拉伸-压缩曲线与实验曲线非常吻合。新开发的装置有利于准确描述成形过程中复杂加载路径下的塑性行为，有助于精确的模拟分析。