ORIGIN OF SHRINKAGE, DISTORTION AND FRACTURE OF PHOTOPOLYMERIZED MATERIAL
ORIGIN OF SHRINKAGE, DISTORTION AND FRACTURE OF PHOTOPOLYMERIZED MATERIAL
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DOI：
10.1016/0025-5408(95)00118-2
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发表时间：
1995-12-01
影响因子：
5.4
通讯作者：
CHEAH, CM
中科院分区：
文献类型：
--
作者：
LU, L;FUH, JYH;CHEAH, CM
研究了不同激光功率设置和层间距对紫外光激光扫描制件的力学性能、显微组织和稳定性的影响。观察到扫描过程中的紫外光功率和涂层厚度对零件的力学性能和形状稳定性都有很大的影响。显微组织观察表明，激光紫外光固化过程中产生了两类缺陷。第一种是气泡形成的气孔。它通常看起来是椭圆形的。第二种类型是可以找到未固化树脂的空腔。通常可以在固化样品的最后一次扫描的上层观察到空洞。它们与低激光功率设置和/或大的层间距有关。实验测量表明，收缩出现在两个不同的方向。
The influence of different laser power settings and layer pitches on the mechanical properties, microstructure and stability of parts built via ultraviolet (UV) laser scanning and subsequent post-curing under an intense UV light was investigated. It was observed that both UV power during scanning and the thickness of the layer have a strong influence on the mechanical properties and shape stability of the parts. Microstructural observation shows that two types of defects are generated during laser UV curing. The first type is the gas hole which is formed from air bubbles. It normally appears elliptical in shape. The second type is the cavity in which uncured resin can be found. Cavities can normally be observed at the upper last scanned layers of a cured specimen. They are associated with low laser power setting and/or large layer pitch. Measurements taken from the experiment indicate shrinkages appearing in two different directions.