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首页> 外文期刊>Machining Science and Technology >LASER CUTTING OF TRIANGULAR GEOMETRY INTO ALUMINA TILES: MORPHOLOGICAL CHANGES AND THERMAL STRESS ANALYSIS
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LASER CUTTING OF TRIANGULAR GEOMETRY INTO ALUMINA TILES: MORPHOLOGICAL CHANGES AND THERMAL STRESS ANALYSIS

机译：将三角形几何形状的激光切割成氧化铝砖：形态变化和热应力分析

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摘要

Laser cutting of triangular geometry into 5-mm-thick alumina tile is carried out. Temperature and stress fields are predicted by using ABAQUS finite element code in line with the experimental conditions. Experiments are carried out to validate the predictions of temperature and the residual stress in the cutting section. Thermocouples are incorporated in temperature measurements while X-ray diffraction technique is accommodated to obtain the residual stress at the kerf surface. The morphological changes in the cutting section are examined by using optical and scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. It is found that temperature and residual stress predictions agree well with their counterparts obtained from the experiments. The optical and SEM micrographs reveal that the cut sections are free from large size defects such as large-scale cracks and sideways burnings. The maximum value of von Mises stress occurs at the mid-thickness of the workpiece due to the formation of high magnitude of thermally induced strain in this region.
机译：将三角形几何形状的激光切割成5毫米厚的氧化铝砖。通过使用ABAQUS有限元代码根据实验条件预测温度和应力场。进行实验以验证切削部分的温度和残余应力的预测。温度测量中结合了热电偶，同时采用了X射线衍射技术以获得切口表面的残余应力。通过使用光学和扫描电子显微镜，能量色散光谱和X射线衍射检查切割部分的形态变化。发现温度和残余应力的预测与从实验中获得的预测相吻合。光学和SEM显微照片显示，切割部分没有大的缺陷，例如大范围的裂纹和侧向燃烧。 von Mises应力的最大值出现在工件的中间厚度处，这是因为在该区域中形成了大量的热感应应变。

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