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首页> 外文期刊>Journal of Applied Physics >Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water
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Two dimensional hydrodynamic simulation of high pressures induced by high power nanosecond laser-matter interactions under water

机译：水下大功率纳秒激光与物质相互作用诱发高压的二维水动力模拟

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摘要

In laser shock peening (LSP) under a water-confinement regime, laser-matter interaction near the coating-water interface can induce very high pressures in the order of gigapascals, which can impart compressive residual stresses into metal workpieces to improve fatigue and corrosion properties. For axisymmetric laser spots with finite size, the pressure generation near the water-coating interface is a two dimensional process in nature. This is in particular the case for microscale LSP performed with very small laser spots, which is a very promising technique to improve the reliability performance of microdevices. However, models capable of predicting two dimensional (2D) spatial distributions of the induced pressures near the coating-water interface in LSP have rarely been reported in literature. In this paper, a predictive 2D axisymmetric model is developed by numerically solving the hydrodynamic equations, supplemented with appropriate equations of state of water and the coating material. The model can produce 2D spatial distributions of material responses near the water-coating interface in LSP, and is verified through comparisons with experimental measurements. The model calculation shows that the effect of radial release wave on pressure spatial distributions becomes more significant as the laser spot size decreases, indicating the importance of a 2D model, particularly for microscale LSP.
机译：在水约束条件下的激光冲击喷丸（LSP）中，涂层与水的界面附近的激光物质相互作用可诱发数十亿帕斯卡的极高压力，从而可向金属工件施加压缩残余应力，从而改善疲劳和腐蚀性能。对于具有有限尺寸的轴对称激光点，在水涂层界面附近产生压力实际上是二维过程。对于具有非常小的激光光斑的微型LSP尤其如此，这是提高微型设备可靠性性能的非常有前途的技术。但是，在文献中很少能够报道能够预测LSP中涂层-水界面附近感应压力的二维（2D）空间分布的模型。本文通过数值求解流体动力学方程，并辅以适当的水和涂料状态方程，建立了可预测的二维轴对称模型。该模型可以在LSP的水涂层界面附近产生材料响应的二维空间分布，并通过与实验测量值的比较进行了验证。模型计算表明，随着激光光斑尺寸的减小，径向释放波对压力空间分布的影响变得更加明显，这表明了二维模型的重要性，尤其是对于微尺度LSP。

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  • 来源
    《Journal of Applied Physics》 |2007年第10期|p.103514.1-103514.8|共8页
  • 作者

    Benxin Wu; Yung C. Shin;

  • 作者单位

    Center for Laser-based Manufacturing, Purdue University, West Lafayette, Indiana 47907;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;计量学;
  • 关键词

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