激光切割液晶玻璃的表面边缘质量分析

发布时间：2018-05-24 23:28

本文选题：激光技术 + 激光切割　；参考：《浙江工业大学学报》2017年03期

【摘要】：在使用激光器切割液晶玻璃过程中,时常会碰到边缘质量问题.从断裂力学的角度,运用实验和数值模拟的方法,探讨了激光扫描速度对裂纹尖端应力强度因子的影响,研究了玻璃表面边缘质量缺陷问题、裂纹偏转角以及裂纹扩展到分叉点时的应力强度因子变化.结果表明:仅增加激光扫描速度2mm/s,对裂纹尖端I型和II型应力强度因子的降低就非常明显;裂纹表面边缘的气泡以及缺陷是由于激光扫描过程中局部温度达到玻璃软化温度造成的;裂纹的偏转角符合最大周向应力准则;裂纹分叉点的应力强度因子大小已超过玻璃断裂韧度,而且在扩展到分叉点过程中,应力强度因子KII的作用呈不断增大现象.
[Abstract]:In the process of using laser to cut liquid crystal glass, the edge quality problem is often encountered. From the point of view of fracture mechanics, the influence of laser scanning velocity on stress intensity factor at crack tip is discussed by means of experiment and numerical simulation. The change of stress intensity factor of crack deflection angle and crack propagation to bifurcation point. The results show that the decrease of mode I and II stress intensity factors at crack tip is obvious when the laser scanning speed is increased only by 2 mm / s. The bubbles and defects at the edge of the crack surface are caused by the local temperature reaching the glass softening temperature during laser scanning, and the deflection angle of the crack conforms to the maximum circumferential stress criterion. The stress intensity factor of the crack bifurcation point is larger than that of the glass fracture toughness, and the effect of the stress intensity factor KII is increasing continuously during the extension to the bifurcation point.
【作者单位】：浙江工业大学机械工程学院;
【基金】：国家自然科学基金资助项目(10972198) 浙江省科技厅资助项目(2009C31104)
【分类号】：TN249;TQ171.683

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