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首页> 外文期刊>Materials Science and Engineering >Effects of varying twist and twist rate sensitivities on the interpretation of torsion testing data
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Effects of varying twist and twist rate sensitivities on the interpretation of torsion testing data

机译：扭曲度和扭曲率灵敏度的变化对扭转测试数据的解释的影响

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摘要

The Nadai and Fields and Backofen expressions are widely used to convert the torque/twist data obtained during torsion testing into shear stress/shear strain curves as well as von Mises equivalent stress/ equivalent strain curves. However, when employed in the conventional manner using average values of the twist hardening exponent N, they overestimate the critical strains for the initiation of twinning, dynamic transformation and dynamic recrystallization by comparison with the values determined using compression testing. By contrast, when the local or instantaneous values of the exponent are employed, the torsion and compression results are in good agreement Another feature of the corrected curves is that they indicate that considerably more dynamic softening takes place during the high temperature deformation of austenite than suggested by the average N flow curves. It is shown that, despite the lack of work conjugacy between the torque-twist and stress-strain curves, the above expressions always lead to the correct constitutive behavior at the external radius.
机译：Nadai和Fields和Backofen表达式被广泛用于将在扭转测试期间获得的扭矩/扭转数据转换为剪切应力/剪切应变曲线以及von Mises等效应力/等效应变曲线。但是，当以常规方式使用扭曲硬化指数N的平均值时，与通过压缩测试确定的值相比，它们高估了引发孪晶，动态转变和动态重结晶的临界应变。相反，当使用指数的局部或瞬时值时，扭转和压缩结果吻合良好。校正曲线的另一个特征是，它们表明在奥氏体高温变形过程中发生的动态软化要比建议的大得多。通过平均N流量曲线。结果表明，尽管在扭扭曲线和应力-应变曲线之间缺乏功共轭性，但以上表达式始终导致外半径处的正确本构行为。

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  • 来源
    《Materials Science and Engineering》 |2014年第3期|9-17|共9页
  • 作者

    John J.Jonas; Frank Montheillet; Laszlo S. Toth; Chiradeep Ghosh;

  • 作者单位

    Department of Materials Engineering, McGill University, 3610 University St., Montreal, QC, Canada H3A 2B2;

    Ecole des Mines, Centre SMS, CNRS UMR 5146, F-42023 St Etienne 2, France;

    Laboratoire d'Etude des Microstructures et de Mecanique des Materiaux, UMR 7239, CNRS/Universite de Lorraine, F-57045 Metz, France,Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures ('LabEx DAMAS'), Universite de Lorraine, France;

    Department of Materials Engineering, McGill University, 3610 University St., Montreal, QC, Canada H3A 2B2;

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  • 正文语种 eng
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  • 关键词

    Torsion testing; Stress-strain curve; Critical strain; Rate sensitivity; Work conjugacy;

    机译：扭转测试;应力-应变曲线;临界应变;速率敏感度;工作共轭;

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