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首页> 外文期刊>Journal of Materials Engineering and Performance >Identification of Post-necking Tensile Stress-Strain Behavior of Steel Sheet: An Experimental Investigation Using Digital Image Correlation Technique
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Identification of Post-necking Tensile Stress-Strain Behavior of Steel Sheet: An Experimental Investigation Using Digital Image Correlation Technique

机译：钢板颈后拉伸应力 - 应变行为的识别：使用数字图像相关技术的实验研究

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摘要

The stress-strain behavior of sheet metal is commonly evaluated by tensile test. However, the true stress-strain curve is restricted up to uniform elongation of the material. Usually, after the uniform elongation of the material the true stress-strain is obtained by extrapolation. The present work demonstrates a procedure to find out the true tensile stress-strain curve of the steel sheet after necking using digital image correlation (DIC) technique. Hill's normal anisotropic yield criteria and local strains measured by DIC technique are used to correct the local stress and strain states at the diffuse necked area. The proposed procedure is shown to successfully determine the true tensile stress-strain curve of ferritic and dual-phase steel sheets after necking/uniform elongation.
机译：金属板的应力 - 应变行为通常通过拉伸试验评估。 然而，真正的应力 - 应变曲线受到材料均匀的伸长率。 通常，在材料的均匀伸长率之后，通过外推获得真正的应力菌株。 本作者演示了一种方法，用于使用数字图像相关（DIC）技术缩放后钢板的真正拉伸应力 - 应变曲线。 通过DIC技术测量的Hill的正常各向异性屈服标准和局部菌株用于校正弥漫区域的局部应力和应变状态。 所提出的程序被证明在缩颈/均匀伸长率之后成功地确定铁素体和双相钢板的真正拉伸应变曲线。

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