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首页> 外文期刊>Journal of Materials Research >Constitutive modeling for strain rate-dependent behaviors of nanocrystalline materials based on dislocation density evolution and strain gradient
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Constitutive modeling for strain rate-dependent behaviors of nanocrystalline materials based on dislocation density evolution and strain gradient

机译：基于位错密度演化和应变梯度的纳米晶材料应变速率相关行为的本构模型

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摘要

To evaluate the influence of strain rate on mechanical behavior of nanocrystalline (NC) materials, a phase mixture constitutive model composed of ordered grain interior phase and plastically softer grain boundary dislocation pile up zone phase was built. Because of dissimilar properties and mismatch between the two phases, dislocation density evolution controlling mechanism based on statistically stored dislocations and geometrically necessary dislocations was analyzed and extended to NC regime to consider their disparate effects. Based on the composite model, a new stress-strain constitutive relation for strain rate-dependent behaviors was firstly established based on dislocation density evolution and strain gradient theory. The calculated data were then compared with corresponding experimental curves and strong strain rate-dependent behaviors were exhibited, which indicated that the predictions kept in good agreement with experiments. Further discussions were presented for calculations of strain rate sensitivity and activation volume for NC Ni through the proposed model.
机译：为了评估应变速率对纳米晶（NC）材料力学性能的影响，建立了由有序晶粒内相和塑性较软的晶界位错堆积区相组成的相混合本构模型。由于两相的性质不同且不匹配，因此分析了基于统计存储的位错和几何上必要的位错的位错密度演化控制机制，并将其扩展到NC态以考虑它们的不同影响。在复合模型的基础上，首先基于位错密度演化和应变梯度理论建立了一种新的应变速率相关行为的应力-应变本构关系。然后将计算的数据与相应的实验曲线进行比较，并显示出强应变率相关的行为，这表明预测与实验保持了良好的一致性。通过所提出的模型，进一步讨论了计算NC Ni的应变速率敏感性和激活体积的问题。

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  • 来源
    《Journal of Materials Research》 |2014年第24期|2982-2993|共12页
  • 作者

    Youyi Wu; Jianqiu Zhou; Shuhong Dong; Aosheng Hu; Lu Wang; Xuming Pang;

  • 作者单位

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China, and School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430070, China;

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

    School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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