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Spall strength of a mild carbon steel: Effects of tensile stress history and shock-induced microstructure

机译：低碳碳钢的剥落强度：拉应力历史和冲击诱发的显微组织的影响

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摘要

The effects of loading on spall strength of a mild steel are investigated systematically under the flat-top impact loading, including the effect of tensile stress history and the effect of shock-induced microstructure. Peak stress, strain rate, pulse duration, spall strength and tensile stress history are obtained directly or indirectly from free-surface velocity measurements, and the recovered samples are characterized with electron backscatter diffraction analysis. For different tensile stress histories, spall strength depends on peak stress or strain rate, depending whether spall occurs on the plateau or rising edge of a tensile pulse. Pulse duration has an effect on whether spall occurs (incipient spallation) but not spall strength. Low shock stresses induce small microstructure change (dislocations) which has weak effects on nucleation and propagation of brittle cleavage cracks, while high shock stresses lead to deformation twins (in addition to dislocations) which act as the source of crack nucleation. A model is proposed to predict the spall strength of the mild steel under arbitrary loading conditions (peak stress below the phase transition).
机译：在平顶冲击载荷下，系统地研究了载荷对低碳钢抗剥落强度的影响，包括拉伸应力历程的影响和冲击诱导的显微组织的影响。峰值应力，应变率，脉冲持续时间，剥落强度和拉伸应力历史可直接或间接地通过自由表面速度测量获得，并通过电子背散射衍射分析对回收的样品进行表征。对于不同的拉伸应力历史，剥落强度取决于峰值应力或应变率，取决于剥落是发生在拉伸脉冲的平稳段还是上升沿。脉冲持续时间会影响是否会发生剥落（初期剥落），但不会影响剥落强度。低冲击应力会引起较小的微观结构变化（位错），这对脆性解理裂纹的成核和扩展影响较弱，而高冲击应力会导致变形孪晶（除了位错），它们是裂纹成核的来源。提出了一个模型来预测低碳钢在任意载荷条件下（相变以下的峰值应力）的剥落强度。

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  • 来源
    《Materials Science and Engineering》 |2019年第29期|461-469|共9页
  • 作者

    Li C.; Yang K.; Tang X. C.; Lu L.; Luo S. N.;

  • 作者单位

    Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China|Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

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

    Plate impact; Loading pulse; Microstructure; Spall strength;

    机译：板冲击;加载脉冲;组织;剥落强度;

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