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Image-based numerical simulation of the local cyclic deformation behavior around cast pore in steel

机译:基于图像的钢铸孔周围局部循环变形行为的数值模拟

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摘要

The local cyclic stress/strain responses around an actual, irregular pore in cast Hadfield steel under fatigue loading are investigated numerically, and compared with those around a spherical and an ellipsoidal pore. The actual pore-containing model takes into account the real shape of the pore imaged via high-resolution synchrotron X-ray computed tomography and combines both isotropic hardening and Bauschinger effects by using the Chaboche's material model, which enables to realistically simulate the cyclic deformation behaviors around actual pore. The results show that the stress and strain energy density concentration factors (K_σ and K_E) around either an actual irregular pore or an idealized pore increase while the strain concentration factor (K_ε) decreases slightly with increasing the number of fatigue cycles. However, all the three parameters, K_σ, K_ε and K_E, around an actual pore are always several times larger than those around an idealized pore, whatever the number of fatigue cycles. It is suggested that the fatigue properties of cast pore-containing materials cannot be realistically evaluated with any idealized pore models. The feasibility of the methodology presented highlights the potential of its application in the micromechanical understanding of fatigue damage phenomena in cast pore-containing materials.
机译:数值研究了疲劳载荷下铸件哈德菲尔德钢中实际不规则孔周围的局部循环应力/应变响应,并将其与球形孔和椭圆孔周围的响应进行了比较。实际的含孔模型考虑了通过高分辨率同步X射线计算机断层扫描成像的孔的真实形状,并通过使用Chaboche的材料模型结合了各向同性硬化和包辛格效应,从而能够真实地模拟循环变形行为在实际毛孔周围。结果表明,实际不规则孔或理想孔周围的应力和应变能密度集中系数(K_σ和K_E)随疲劳循环次数的增加而略有降低。但是,无论疲劳循环的次数如何,实际孔周围的所有三个参数K_σ,K_ε和K_E总是比理想孔周围的参数大几倍。建议使用任何理想化的孔隙模型无法实际评估含孔铸件的疲劳性能。所提出的方法的可行性突出了其在微观机械理解含孔铸造材料中的疲劳损伤现象方面的潜力。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第10期|347-354|共8页
  • 作者单位

    National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, China,State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, China;

    Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, China;

    Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China,National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cyclic deformation; Low-cycle fatigue; Local stress/strain behavior; Image-based simulation; Chaboche's model;

    机译:循环变形;低周疲劳;局部应力/应变行为;基于图像的模拟;Chaboche的模型;

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