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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior
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A full-range stress-strain model for metallic materials depicting non-linear strain-hardening behavior

机译：金属材料的全范围应力 - 应变模型，其描绘非线性应变硬化行为的金属材料

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摘要

Ramberg-Osgood (R-O) type stress-strain models are commonly employed during elasto-plastic analysis of metals. Recently, 2-stage and 3-stage R-O variant models have been proposed to replicate stress-strain behavior under large plastic deformation. The complexity of these models increases with the addition of each stage. Moreover, these models have considered deformation till necking only. In this paper, a simplistic multi-stage constitutive model is proposed to capture the strain-hardening non-linearity shown by metals including its post necking behavior. The constitutive parameters of the proposed stress-strain model can be determined using only elastic modulus and yield strength. 3-D digital image correlation was used as an experimental tool for measuring full-field strains on the specimens, which were subsequently utilized to obtain the material parameters. Our constitutive model is demonstrated with an aerospace-grade stainless steel AISI 321 wherein deformation response averaged over the gauge length (GL) and at a local necking zone are compared. The resulting averaged and local material parameters obtained from the proposed model provide interesting insights into the pre and post necking deformation behavior. Our constitutive model would be useful for characterizing highly ductile metals which may or may not depict non-linear strain hardening behavior including their post necking deformations.
机译：Ramberg-Osgood（R-O）型应力 - 应变模型通常在金属弹塑性分析过程中使用。最近，已经提出了2阶段和3级R-O变体模型以在大塑性变形下复制应力 - 应变行为。这些模型的复杂性随着每个阶段的增加而增加。此外，这些模型仅被认为是变形，直到仅颈缩。在本文中，提出了一种简化的多阶段本构模型，以捕获金属所示的应变硬化非线性，包括其后颈缩小行为。可以仅使用弹性模量和屈服强度来确定所提出的应力 - 应变模型的组成参数。 3-D数字图像相关用作测量样品上的全场菌株的实验工具，随后用于获得材料参数。通过航空级不锈钢AISI 321证明了我们的本构体模型，其中比较了在规格长度（GL）和局部颈区上平均变形响应。由所提出的模型获得的得到的平均和局部材料参数为前颈缩闭变行为提供了有趣的见解。我们的本构模型可用于表征高度延展金属，其可能或不描绘包括其后颈后变形的非线性应变硬化行为。

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