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首页> 外文期刊>Journal of engineering materials and technology >The Computation and Measurement of Residual Stresses in Laser Deposited Layers
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The Computation and Measurement of Residual Stresses in Laser Deposited Layers

机译：激光沉积层中残余应力的计算和测量

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摘要

Laser metal forming is an attractive process for rapid prototyping or the rebuilding of worn parts. However, large tensile stress may arise in layers deposited by laser melting of powder. A potential solution is to preheat the substrate before and during deposition of layers to introduce sufficient contraction during cooling in the substrate to modify the residual stress distribution in the deposited layers. To demonstrate the value of this approach, specimens were prepared by depositing stellite F on a stainless steel substrate with and without preheating. Residual stresses were computed by numerical simulation and measured using the crack compliance method. For non-preheated specimens simulation and experiment agreed well and showed that extremely high residual tensile stresses were present in the laser melted material. By contrast, pre-heated specimens show high compressive stresses in the clad material. However, in this case the numerical simulation and experimental measurement showed very different stress distribution. This is attributed to out of plane deformation due to the high compressive stresses which are not permitted in the numerical simulation. A "strength of materials" analysis of the effect of out of plane deformation was used to correct the simulation, Agreement with experimental results was then satisfactory.
机译：激光金属成型是快速成型或磨损零件重建的有吸引力的过程。然而，通过粉末的激光熔化沉积的层中可能产生大的拉伸应力。一种潜在的解决方案是在沉积层之前和期间预加热基底，以在冷却基底期间引入足够的收缩，以改变沉积层中的残余应力分布。为了证明这种方法的价值，通过在不带预热和不带预热的条件下，在不锈钢基体上沉积司太立合金F来制备样品。通过数值模拟计算残余应力，并使用裂纹柔度法进行测量。对于未预热的样品，仿真和实验结果很好，表明在激光熔融材料中存在极高的残余拉伸应力。相比之下，预热的样品在复合材料中显示出较高的压缩应力。但是，在这种情况下，数值模拟和实验测量显示出非常不同的应力分布。这归因于由于高压缩应力而导致的平面外变形，这在数值模拟中是不允许的。使用“材料强度”分析平面外变形的影响来校正模拟，与实验结果的一致性令人满意。

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  • 来源
    《Journal of engineering materials and technology》 |2003年第3期|p. 302-308|共7页
  • 作者

    S. Finnie; W. Cheng; I. Finnie; J. M. Drezet; M. Gremaud;

  • 作者单位

    145W. 67th Street, Apt. 26D, New York, NY 10023;

    BEAR, Inc. 2216 5th Street, Berkeley, CA 94710;

    University of California, Berkeley, Dept. of Mech. Eng., Berkeley, CA 94720;

    CALCOM SA, PSE-EPFL. 1015 Lausanne, Switzerland;

    CALCOM SA, PSE-EPFL. 1015 Lausanne, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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