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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >Obtaining Reliable True Plastic Stress-Strain Curves in a Wide Range of Strains Using Digital Image Correlation in Tensile Testing
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Obtaining Reliable True Plastic Stress-Strain Curves in a Wide Range of Strains Using Digital Image Correlation in Tensile Testing

机译：在拉伸测试中使用数字图像相关性获得大范围菌株的可靠真实塑性应力-应变曲线

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摘要

In order to significantly extend the limit of the measurable strain range to obtain true stress-strain curves of materials using tensile testing, digital image correlation is used to measure local strains. In this study, a method to measure reliable true stress-strain curves in a wide range of strains covering the post-necking stage with reducing gage lengths has been investigated. In tensile testing, by decreasing the gage length for the strain measurements, not only accurate true strain but also reliable true stress can be obtained until sample fractures. This experimental method for accurate true stress-strain measurements is verified by comparing the experimental results and the finite element method simulated load-displacement curve, geometries, and strain distributions. The new method can be used to easily obtain the measurement of accurate and extended true stress-strain curves, which can assist in experimental and theoretical investigations of the mechanical behavior of materials. This simple method has shed new light on the measurement of the mechanical properties of materials for both experimentalists and simulation engineers, who need a wide range of true stress-strain curves.
机译：为了显着扩展可测应变范围的极限，以使用拉伸测试获得材料的真实应力-应变曲线，使用数字图像相关性来测量局部应变。在这项研究中，已经研究了一种方法，该方法可以测量在覆盖颈缩后阶段且应变仪长度减小的各种应变中的可靠真实应力-应变曲线。在拉伸测试中，通过减少应变测量的应变片长度，不仅可以获得准确的真实应变，而且可以获得可靠的真实应力，直到样品断裂为止。通过比较实验结果和有限元方法模拟的载荷-位移曲线，几何形状和应变分布，验证了该用于精确的真实应力-应变测量的实验方法。这种新方法可以轻松地获得准确和扩展的真实应力-应变曲线的测量值，从而有助于对材料的机械性能进行实验和理论研究。这种简单的方法为需要广泛的真实应力-应变曲线的实验人员和模拟工程师提供了新的材料力学性能测量方法。

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