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Dynamic tensile strength of polyurea

机译：聚脲的动态拉伸强度

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摘要

Dynamic tensile strength of polyurea is measured at an ultrahigh strain rate of 1.67×10~7 s~(-1) by generating spall failures inside thick polyurea coatings bonded to steel plates using laser-generated stress waves of several nanoseconds in duration. Specifically, thick polyurea films were cast on a steel plate whose backside was provided with water glass-covered Al film. The Al film was melted by focusing a high-energy Nd: YAG laser pulse over 3-mm-diameter area. Exfoliation of the Al generated a compressive stress wave toward the polyurea coating, which turned tensile upon reflection from the free surface. At a threshold laser energy, the amplitude of the returning tensile stress wave exceeded the dynamic tensile strength of polyurea. The stress wave profile inside the steel plate was interferometrically recorded at the threshold laser fluence and was used in a wave mechanics simulation to calculate the peak tensile stress. The polyurea was modeled as a viscoelastic solid.
机译：聚脲的动态拉伸强度是在1.67×10〜7 s〜（-1）的超高应变速率下通过使用激光产生的持续时间为几纳秒的应力波在粘结到钢板上的厚聚脲涂层内部产生剥落破坏来测量的。具体地，将厚的聚脲膜流延在钢板上，该钢板的背面设置有水玻璃覆盖的Al膜。通过将高能Nd：YAG激光脉冲聚焦在直径3毫米的区域上来熔化Al膜。 Al的剥落会产生朝向聚脲涂层的压缩应力波，该压缩波在从自由表面反射时变为拉伸。在激光能量阈值下，返回拉伸应力波的振幅超过了聚脲的动态拉伸强度。在阈值激光通量下，通过干涉仪记录了钢板内部的应力波分布，并将其用于波力学模拟以计算峰值拉伸应力。将聚脲建模为粘弹性固体。

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  • 来源
    《Journal of Materials Research》 |2012年第2期|p.494-499|共6页
  • 作者

    George Youssef; Vijay Gupta;

  • 作者单位

    Department of Mechanical Engineering, University of California Los Angeles, Los Angeles, California 90095;

    Department of Mechanical Engineering, University of California Los Angeles, Los Angeles, California 90095;

  • 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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  • 正文语种 eng
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