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Experimental investigation on the strain-rate effect and inertia effect of closed-cell aluminum foam subjected to dynamic loading

机译：动态载荷下闭孔泡沫铝的应变率效应和惯性效应的实验研究

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摘要

In this paper, a series of experiments were conducted to clarify the effects of the strain rate and inertia on the deformation behavior of closed-cell aluminum foams under impact. The quartz-crystal technique was employed to analyze the stress uniformity of aluminum foam samples under split Hopkinson pressure bar (SHPB) loading. It was revealed that the condition of stress uniformity is hard to reach for a thicker foam sample, and the strength of aluminum foam is sensitive to strain rate. Two different direct-impact Hopkinson pressure bar (DHPB) methods were introduced to validate the three deformation modes, i.e. homogeneous mode, transitional mode and shock mode. Results displayed that the stress at the front surface increased dramatically than that at the back surface as the impact speeds increased from 16 m/s to 113 m/s. The axial-inertia effect became more important than the strain rate effect under high speed impact. The dynamic deformation processes were recorded by a Phantom-675 camera and were analyzed through the digital imaging correlation (DIC) method. The deformation of aluminum foam in homogeneous mode was presented by the evolution of global distributed failure, but it was dominated by the local failure in shock mode.
机译：在本文中，进行了一系列实验以弄清应变率和惯性对冲击下闭孔铝泡沫的变形行为的影响。采用石英晶体技术分析了在霍普金森压力棒（SHPB）加载下泡沫铝样品的应力均匀性。结果表明，对于较厚的泡沫样品，难以达到应力均匀性的条件，而泡沫铝的强度对应变率敏感。引入了两种不同的直接冲击霍普金森压力杆（DHPB）方法来验证三种变形模式，即均质模式，过渡模式和冲击模式。结果表明，随着冲击速度从16 m / s增加到113 m / s，正面的应力比背面的应力急剧增加。在高速冲击下，轴向惯性效应比应变率效应更为重要。动态变形过程由Phantom-675相机记录，并通过数字成像相关（DIC）方法进行分析。泡沫铝在均质模式下的变形由整体分布破坏的演化来表示，而在冲击模式下则以局部破坏为主。

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  • 来源
    《Materials Science and Engineering》 |2015年第3期|253-261|共9页
  • 作者

    Pengfei Wang; Songlin Xu; Zhibin Li; Jinglei Yang; Chao Zhang; Hang Zheng; Shisheng Hu;

  • 作者单位

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China ,School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China;

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, PR China;

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

    Strain rate effect; Inertia effect; Aluminum foams; Hopkinson bar; Dynamic behavior;

    机译：应变率效应;惯性作用;铝泡沫;霍普金森酒吧;动态行为;

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