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Measurement and modeling of laser peening residual stresses in geometrically complex specimens.

机译：几何复杂标本中激光喷丸残余应力的测量和建模。

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摘要

Laser peening is a surface treatment, which uses a pulsed laser to generate compressive residual stress near critical locations (i.e., locations of high stress) along the material surface. The compressive residual stress is beneficial in terms of material performance. Oftentimes, the critical locations are near geometric features, since they act as stress concentrations. Thus, the treatment of geometric features is an essential part of the laser peening process. Much of the research in the field of laser peening, however, has been performed on simple rectangular bodies. As an extension to previous studies, this work investigates the effects of common geometric features on the residual stress resulting from laser peening treatment using residual stress measurement and modeling techniques.; Residual stress measurements were performed using the contour method. A detailed description of the contour method is given in Chapter 2 including a representative measurement made on a laser peened Alloy 22 gas tungsten arc weld. Throughout the course of this work an extension to the contour method was developed, called the contour rosette method (Chapter 3), allowing for the measurement of all six residual stress components in continuously-processed bodies (the previous methodology determines only a single residual stress component). The contour rosette method was verified for 2D and 3D bodies using numerical experiments and example measurements were performed on real specimens.; Next, a methodology was developed to predict the residual stress resulting from laser peening treatment in arbitrary (3D) bodies treated with an arbitrary coverage area (Chapter 4). This methodology uses the eigenstrain (source of residual stress) produced by laser peening coupled with a finite element model of the specimen geometry to predict residual stress.; Chapter 5 takes a close look at the effects of common geometric features on the residual stress resulting from laser peening treatment. Residual stress was measured using the contour method for a range of common geometric features. These results were compared with predictions generated using the laser peening residual stress prediction model. There was mixed agreement between the measurements and the predictions but in general the trends were similar.
机译：激光喷丸是一种表面处理，它使用脉冲激光在沿材料表面的关键位置（即高应力位置）附近产生压缩残余应力。压缩残余应力在材料性能方面是有益的。通常，关键位置靠近几何特征，因为它们充当应力集中。因此，几何特征的处理是激光喷丸处理的重要组成部分。然而，激光喷丸领域的许多研究都是在简单的矩形体上进行的。作为先前研究的扩展，这项工作使用残余应力测量和建模技术研究了常见几何特征对激光喷丸处理产生的残余应力的影响。使用轮廓法进行残余应力测量。第2章详细介绍了轮廓法，其中包括对激光喷丸的Alloy 22气体钨极电弧焊进行的代表性测量。在整个工作过程中，对轮廓方法的扩展进行了开发，称为轮廓玫瑰花形方法（第3章），它允许测量连续加工的物体中所有六个残余应力分量（以前的方法仅确定一个残余应力）零件）。使用数值实验对2D和3D物体验证了轮廓玫瑰花饰法，并在实际样本上进行了示例测量。接下来，开发了一种方法来预测由激光喷丸处理在以任意覆盖区域处理的任意（3D）物体中产生的残余应力（第4章）。该方法使用激光喷丸产生的本征应变（残余应力源）和试样几何形状的有限元模型来预测残余应力。第5章仔细研究了常见几何特征对激光喷丸处理产生的残余应力的影响。使用轮廓方法对一系列常见的几何特征测量残余应力。将这些结果与使用激光喷丸残余应力预测模型生成的预测进行了比较。测量值和预测值之间存在混合的共识，但总体上趋势是相似的。

著录项

  • 作者

    DeWald, Adrian T.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 151 p.
  • 总页数 151
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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