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首页> 外文期刊>Optics & Laser Technology >Evaluation of thermal residual stresses in laser drilled alumina ceramics using Micro-Raman spectroscopy and COMSOL Multiphysics
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Evaluation of thermal residual stresses in laser drilled alumina ceramics using Micro-Raman spectroscopy and COMSOL Multiphysics

机译：使用微拉曼光谱和COMSOL Multiphysics评估激光钻孔氧化铝陶瓷中的热残余应力

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摘要

This paper presents evaluation of thermal residual stresses in the heat affected zone of laser drilled alumina ceramic by using Micro-Raman spectroscopy. The residual stresses were evaluated for the holes corresponding to the optimal parameters of laser power, scanning speed, frequency and hole diameter. Three such cases were considered for the study. Residual stresses were obtained as a function of the Raman shifts. The nature and magnitude of the residual stresses were indicative of the extent of damage caused in the heat affected zone. In cases where the initial tensile residual stresses exceeded the tensile strength of alumina, cracks were initiated. Laser drilling with higher laser power and lower scanning speed induced initially high compressive and cyclic thermal stresses, causing greater damage to the hole. Transient thermal analysis was performed using COMSOL Multiphysics to predict residual thermal stresses and to validate the micro-Raman results. Scanning Electron Microscopy was used to confirm the damage caused in the heat affected zone. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文利用显微拉曼光谱技术评估了激光钻孔氧化铝陶瓷热影响区的残余热应力。评估孔的残余应力，这些残余应力对应于激光功率，扫描速度，频率和孔直径的最佳参数。研究中考虑了三个这样的案例。残余应力是拉曼位移的函数。残余应力的性质和大小指示了在热影响区中引起的破坏程度。如果初始拉伸残余应力超过氧化铝的拉伸强度，则会产生裂纹。具有较高激光功率和较低扫描速度的激光钻孔最初会引起较高的压缩和循环热应力，从而对孔造成更大的损坏。使用COMSOL Multiphysics进行瞬态热分析，以预测残余热应力并验证微拉曼结果。使用扫描电子显微镜确认在热影响区中引起的损坏。 （C）2015 Elsevier Ltd.保留所有权利。

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