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Neutron diffraction and finite element analysis of the residual stress distribution of copper processed by equal-channel angular pressing

机译：等通道角压加工铜的残余应力分布的中子衍射和有限元分析

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摘要

Residual stress remaining after plastic deformation significantly affects the physical and chemical behaviors of materials. In this work, the residual stress distribution in Cu after single-pass equal-channel angular pressing (ECAP) was evaluated using neutron diffraction and the finite element method (FEM). The residual stress distributions simulated using the FEM are in good agreement with the experimental results measured using the neutron diffraction method. The workpiece had non-uniform distribution of residual stresses from bottom to top region of a rod specimen with circular cross-section. The axial residual stress in the top region of the workpiece was highly tensile; while it was only slightly tensile in the bottom region. On the other hand, the radial and hoop residual stresses were tensile in the bottom region, whereas they were compressive in the top region. Despite such non-uniformity of residual stresses, the middle region of the workpiece had relatively homogeneous tensile residual stresses. This investigation on the residual stress distribution in the ECAP-processed material provides a new window from which engineering problems in related with residual stress can be issued and solved.
机译：塑性变形后残留的残余应力会显着影响材料的物理和化学行为。在这项工作中，使用中子衍射和有限元方法（FEM）对单次通过等通道角挤压（ECAP）后铜中的残余应力分布进行了评估。使用有限元法模拟的残余应力分布与使用中子衍射法测得的实验结果非常吻合。工件在具有圆形横截面的棒状样品的底部到顶部区域的残余应力分布不均匀。工件顶部区域的轴向残余应力具有很高的拉力。而在底部区域仅轻微拉伸。另一方面，径向和环向残余应力在底部区域是拉伸的，而在顶部区域是压缩的。尽管存在残余应力的这种不均匀性，但是工件的中间区域具有相对均匀的拉伸残余应力。对ECAP加工材料中残余应力分布的研究提供了一个新的窗口，从中可以发布和解决与残余应力有关的工程问题。

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  • 来源
    《Materials Science and Engineering》 |2017年第13期|691-697|共7页
  • 作者

    Hak Hyeon Lee; Kapil Dev Gangwar; Kyung-Tae Park; Wanchuck Woo; Hyoung Seop Kim;

  • 作者单位

    Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea;

    Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea;

    Department of Materials Science and Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea;

    Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea;

    Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea,Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Residual stress; Equal channel angular pressing; Finite element method; Neutron diffraction method; Severe plastic deformation;

    机译：残余应力;等通道角压;有限元法;中子衍射法严重的塑性变形;

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