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首页> 外文期刊>Advances in civil engineering >Investigation on True Stress-Strain Curves of Flat and Corner Regions of Cold-Formed Section Using 3D Digital Image Correlation Method
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Investigation on True Stress-Strain Curves of Flat and Corner Regions of Cold-Formed Section Using 3D Digital Image Correlation Method

机译：使用3D数字图像相关方法对冷成型截面扁平和角区真正应力 - 应变曲线的研究

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摘要

The true stress-strain curve is the critical method to describe the practical material mechanical performance and the essential precondition to develop the advanced numerical simulation. Experimental, analytical, and numerical procedures were performed in present research to investigate the true stress-strain curves of flat and corner regions of the cold-formed channel section. The coupon tests with the 3D digital image correlation system were conducted on flat and corner specimens to directly obtain the true stress-strain curves. The experimental results indicate that the tensile secondary-hardening phenomenon at the plastic strain stage was observed in the true stress-strain curves of flat coupons, and initial strain hardening behavior was produced in that of corner coupons. Flat region exhibits a significant improvement of true ultimate strength compared to the engineering value. The stress status of the corner region is developed to ultimate strength at the early strain phase and exhibits a slight increase compared with the nominal values at the plastic phase. Cold-rolling action limits the ductility performance of the corner region, which highly restrains the tensile strain hardening at the plastic condition. Thus, the true yielding strength of the corner region is obviously higher, but the true ultimate strength is significantly lower than that of the flat region. Together with the optical measuring results, a trilinear model with two-stage strain hardening and a simplified trilinear models were established for describing the true stress-strain curves of flat and corner regions, respectively. The load-displacement curves from numerical simulations fit very well with those of coupon tests, which validate the reliability of the optic measurement and the dependability of the simplified constitutive models.
机译：真正的应力 - 应变曲线是描述实用材料机械性能和发展先进数值模拟的重要方法的关键方法。在本研究中进行了实验，分析和数值手术，以研究冷形成通道部分的平板和角区域的真实应力 - 应变曲线。使用3D数字图像相关系统的优惠券测试在平坦的和角标本上进行，直接获得真正的应力 - 应变曲线。实验结果表明，在扁平试样的真正应力 - 应变曲线中观察到塑料应变阶段的拉伸二次硬化现象，并以拐角优惠券的初始应变硬化行为产生。与工程价值相比，平坦区域表现出真正的极限强度的显着提高。角域区域的应力状态是在早应变相的最终强度开发，并且与塑性相处的标称值相比表现出略微增加。冷轧动作限制了拐角区域的延展性性能，其高度限制在塑料条件下的拉伸应变硬化。因此，角部区域的真正屈服强度明显较高，但真正的极限强度显着低于平坦区域的强度。建立了一种具有两级应变硬化的三线性模型和简化的三轴模型的三线性模型，分别用于描述平板和角区的真正应力 - 应变曲线。来自数值模拟的负载 - 位移曲线与优惠券测试非常良好，这验证了光学测量的可靠性和简化本构模型的可靠性。

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  • 来源
    《Advances in civil engineering》 |2019年第16期|3138176.1-3138176.18|共18页
  • 作者

    Xu Bo; Xia Junwu; Ma Renwei; Wang Jian; Chen Xiaomiao; Chang Hongfei; Zhang Lihai;

  • 作者单位

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Bldg Energy Saving Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Bldg Energy Saving Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Bldg Energy Saving Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Bldg Energy Saving Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Jiangsu Key Lab Environm Impact & Struct Safety E Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Jiangsu Peoples R China;

    Univ Melbourne Dept Infrastruct Engn Melbourne Vic 3010 Australia;

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