Abstract:

This paper reported the real-time monitoring method of crack propagation in metals with quantum dots. Experimental results show that the crack of epoxy resin mixing with quantum dot exhibits a bright line at crack, and its fluorescence intensity in the crack area is much higher than that of non-crack parts. With the help of confocal microscopy, the crack width can be detected as low as 7μm, stating that the detection limitation is greatly improved comparing with other non-destructive testing methods.

Key words: quantum dot(QD), metal crack propagation, confocal microscopy, fluorescence intensity, non-destructive testing

摘要：

研究了基于量子点的荧光特性实时监测金属裂纹扩展的方法。标准金属试样上涂覆了添加量子点的环氧树脂膜，在试样加载拉伸过程中，出现金属裂纹的区域伴随明显亮线，光谱测试发现其荧光强度明显高于非裂纹区域。借助共聚焦显微镜可观测到裂纹宽度最小达7μm，比已知的其他无损检测方法的探测极限有了显著提高。

关键词: 量子点, 金属裂纹扩展, 共聚焦显微镜, 荧光强度, 无损检测