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Spall damage of a mild carbon steel: Effects of peak stress, strain rate and pulse duration

机译:低碳碳钢的散裂损伤:峰值应力,应变率和脉冲持续时间的影响

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摘要

We investigate spall damage of a mild carbon steel under high strain-rate loading, regarding the effects of peak stress, strain rate, and pulse duration on spall strength and damage, as well as related micro-structure features, using gas gun plate impact, laser velocimetry, and electron backscatter diffraction analysis. Our experiments demonstrate strong dependences of spall strength on peak stress and strain rate, and its weak dependence on pulse duration. We establish numerical relations between damage and peak stress or pulse duration. Brittle and ductile spall fracture modes are observed at different loading conditions. Damage nucleates at grain boundaries and triple junctions, either as transgranular cleavage cracks or voids.
机译:我们使用气枪板冲击力研究了高应变率载荷下低碳碳钢的剥落损伤,其中涉及峰值应力,应变率和脉冲持续时间对剥落强度和损伤以及相关微结构特征的影响,激光测速和电子背散射衍射分析。我们的实验表明,剥落强度对峰值应力和应变率的依赖性很强,而对脉冲持续时间的依赖性很弱。我们建立损伤与峰值应力或脉冲持续时间之间的数值关系。在不同的载荷条件下观察到脆性和延性剥落断裂模式。损伤核在晶界和三重接合处成核,可能是经晶分裂裂缝或空洞。

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  • 来源
    《Materials Science and Engineering》 |2016年第13期|139-147|共9页
  • 作者单位

    College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610064, PR China ,Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China ,The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, PR China;

    The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, PR China ,CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modem Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, PR China ,CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modem Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modem Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China;

    College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610064, PR China;

    The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, PR China ,CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modem Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, PR China;

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

    Peak stress; Pulse duration; Strain rate; Mild carbon steel; Spallation; Microstructure;

    机译:峰值应力;脉冲持续时间;应变率;低碳钢;散裂;微观结构;

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