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首页> 外文期刊>Materials Science and Engineering >Experimental and computational study of microstructural effect on ductile fracture of hot-forming materials
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Experimental and computational study of microstructural effect on ductile fracture of hot-forming materials

机译：显微组织对热成型材料延性断裂的影响的实验和计算研究

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摘要

Thermo-mechanical experiments at different elevated temperatures are carried out for tensile and shear-dominant specimens extracted from warming forming materials of 7075 aluminum alloy and 22MnB5 boron steel, respectively. A specimen-embedded furnace jointed by temp-control system to perform the high temperature shear experiments. Driven by microscale anisotropic plastic flow, damage is embedded in each slip system and damage evolution is controlled by the preferential dislocation slip. Combined with microscale damage and dislocation density based constitutive model, an advanced crystal plasticity method is proposed to perform predictions of mechanical behavior of face-center-cubic materials at various temperatures. Reasonable agreement is obtained between experimental and numerical results for different specimens, temperature conditions and materials. This approach simultaneously captures the strain hardening rate, damage softening, non-linear post-necking and fracture strain. Microstructural effects on ductile fracture are tracked and investigated including dislocation density and crystallographic orientation. The results show that local dislocation density rise is associated with damage initiation. Different fracture morphologies and necking paths are caused by distinct initial misorientation distributions in comparison with experimental observation of 7075 aluminum alloy. Local misorientations are investigated and critical misorientation ranges are computed for promoting void growth in zigzag and straight fracture morphologies. Schmid factor is computed as not necessary variable to trigger void growth.
机译：对分别从7075铝合金和22MnB5硼钢的热成型材料中提取的拉伸和剪切主导样品进行了不同高温下的热机械实验。通过温度控制系统连接的标本嵌入炉进行高温剪切实验。在微观各向异性塑料流的驱动下，损伤被嵌入到每个滑动系统中，并且损伤的演化由优先错位滑动控制。结合基于微观损伤和位错密度的本构模型，提出了一种先进的晶体可塑性方法，以预测面心立方材料在不同温度下的力学行为。对于不同的样品，温度条件和材料，实验和数值结果之间取得了合理的一致性。该方法同时捕获应变硬化率，损伤软化，非线性颈缩和断裂应变。跟踪和研究了对韧性断裂的微观结构影响，包括位错密度和晶体学取向。结果表明，局部位错密度的升高与损伤的发生有关。与7075铝合金的实验观察结果相比，不同的断裂形态和缩颈路径是由不同的初始取向差分布引起的。研究了局部取向错误，计算了严重取向错误的范围，以促进锯齿形和直形断裂形态的空隙生长。施密特因子被计算为触发空隙增长的不必要变量。

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  • 来源
    《Materials Science and Engineering》 |2018年第may2期|298-323|共26页
  • 作者

    Yang Liu; Yiguo Zhu; Caglar Oskay; Ping Hu; Liang Ying; Dantong Wang;

  • 作者单位

    State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology;

    State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology;

    Department of Civil and Environmental Engineering, Vanderbilt University;

    State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology;

    State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology;

    State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Polycrystalline material; Crystal plasticity; Constitutive behavior; Dislocation density; Microscale damage; Thermo-mechanical processes;

    机译：多晶材料;晶体可塑性;本构行为;位错密度;微尺度损伤;热机械过程;

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