A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC

Surajit Kumar Paul; Satish Roy; S. Sivaprasad; S. Tarafder

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A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC

机译：一种简化的过程，用于使用DIC从圆形金属样品的单轴拉伸试验中确定颈颈缩小应力曲线

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摘要

Triaxial state of stress is usually generated in the necked zone because of neck geometry, and as a consequence proper correction of true tensile stress–strain curve after necking is mandatory. Various correction factors like Bridgman, Davidenkov and Spiridonova, Siebel and Schwaigere are available in the published literature to calculate true stress from mean axial stress. Similarly true strains can be calculated from the minimum diameters of the round specimen in the necked region for various true stress levels. But experimental determination of correction factors and minimum diameters of the round specimen in the necked region is a cumbersome task. This investigation shows a simplified procedure to determine true strains and the correction factors from digital image correlation-based local strain measurement in the necked region. The present procedure is validated by experimental results of rail steel.

机译：由于颈部几何形状的原因，通常会在颈部区域产生三轴应力状态，因此，必须对颈部后的真实拉伸应力-应变曲线进行适当校正。各种修正系数，如Bridgman、Davidenkov和Spiridonova、Siebel和Schwaigere，可在已发表的文献中从平均轴向应力计算真实应力。同样，对于不同的真实应力水平，可以从颈缩区圆形试样的最小直径计算真实应变。但是，通过实验确定颈缩区圆形试样的修正系数和最小直径是一项繁琐的任务。这项研究显示了一种简化的程序，可以通过基于数字图像相关的颈缩区域局部应变测量来确定真实应变和校正因子。钢轨钢的试验结果验证了该方法的有效性。

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来源
《Journal of Materials Engineering and Performance》 |2018年第9期|共7页
作者
Surajit Kumar Paul; Satish Roy; S. Sivaprasad; S. Tarafder;
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作者单位

Department of Mechanical Engineering Indian Institute of Technology Patna;

Fatigue and Fracture Group CSIR-National Metallurgical Laboratory;

Fatigue and Fracture Group CSIR-National Metallurgical Laboratory;

Fatigue and Fracture Group CSIR-National Metallurgical Laboratory;

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原文格式 PDF
正文语种 eng
中图分类金属学与金属工艺;工程材料学;
关键词
correction factor; digital image correlation; finite element analysis; necking; true stress–strain curve;

机译：修正系数;数字图像相关;有限元分析;颈缩;真应力-应变曲线;

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5. A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC [J] . Surajit Kumar Paul, Satish Roy, S. Sivaprasad, Journal of Materials Engineering and Performance . 2018,第9期

机译：一种简化的过程，用于使用DIC从圆形金属样品的单轴拉伸试验中确定颈颈缩小应力曲线
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A Simplified Procedure to Determine Post-necking True Stress–Strain Curve from Uniaxial Tensile Test of Round Metallic Specimen Using DIC

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