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Experimental research on laser shock forming metal foils with femtosecond laser

机译：飞秒激光形成激光冲击金属箔的实验研究

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摘要

Laser shock forming metal foils with femtosecond (fs) laser has been investigated experimentally in this article. A new transparent material was used as confining layer. Two destroying mechanisms of the confining layer have been observed and analyzed. With appropriate processing parameters, we have validated that macro plastic deformations (micro dents) can be formed on metal foils through fs laser-induced shock wave. Surface morphologies and 3D profiles of dents were measured. Results show that there exists a relatively optimum pulse range for obtaining better shock effects. Too short pulse duration will induce serious nonlinear absorption of confining layer, while too large pulse duration will decrease light intensities. Both are detrimental for improving laser shock effect. One abnormal phenomenon about the influence of impact times on dent depths has been found. Through analysis and experiments, we analyzed that loose constraint condition of samples led to flattening effect on deeper dents and then decrease the dent depths. Confining layer can significantly enhance laser shock effect and improve plastic deformation, which is same as ns laser. The new confining layer has been proved to be suitable for fs laser shock forming.
机译：本文已通过飞秒（fs）激光对形成激光冲击的金属箔进行了实验研究。一种新的透明材料被用作限制层。观察并分析了限制层的两种破坏机理。通过适当的加工参数，我们已经验证了可以通过fs激光诱发的冲击波在金属箔上形成宏观塑性变形（微凹痕）。测量了凹痕的表面形态和3D轮廓。结果表明，存在一个相对最佳的脉冲范围以获得更好的冲击效果。太短的脉冲持续时间将导致约束层严重的非线性吸收，而太长的脉冲持续时间将降低光强度。两者均不利于提高激光冲击效果。已经发现一种关于冲击时间对凹痕深度的影响的异常现象。通过分析和实验，我们分析了样品的松散约束条件导致对较深凹痕的平坦化作用，然后减小了凹痕深度。与ns激光相同，限制层可以显着增强激光冲击效果并改善塑性变形。新的限制层已被证明适用于fs激光冲击成形。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|600-606|共7页
  • 作者

    Y.X. Ye; Y.Y. Feng; X.J. Hua; Z.C. Lian1;

  • 作者单位

    School of Mechanical Engineering, Jiangsu University, Zhenjiang 21203, PR China ,Jiangsu Provincial Key Laboratory for Science and Technology of Photon Manufacturing, Jiangsu University, Zhenjiang 2120l3, PR China;

    School of Mechanical Engineering, Jiangsu University, Zhenjiang 21203, PR China;

    School of Mechanical Engineering, Jiangsu University, Zhenjiang 21203, PR China;

    School of Mechanical Engineering, Jiangsu University, Zhenjiang 21203, PR China;

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

    Femtosecond laser; User shock forming; Plastic deformation; Metal foils;

    机译：飞秒激光;用户冲击形成;塑性变形;金属箔;

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