Use of Femtosecond Laser Technique for Studying Physically Small Cracks
Use of Femtosecond Laser Technique for Studying Physically Small Cracks
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DOI：
10.1007/s10704-006-0104-5
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发表时间：
2006-06
影响因子：
2.5
通讯作者：
Y. Motoyashiki;A. Brückner-foit;L. Englert;L. Haag;M. Wollenhaupt;T. Baumert
中科院分区：
文献类型：
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作者：
Y. Motoyashiki;A. Brückner-foit;L. Englert;L. Haag;M. Wollenhaupt;T. Baumert
由于微裂纹扩展行为受微观结构的强烈影响，因此需要非常小的亚毫米范围的人工缺口来系统地研究微裂纹行为。超短脉冲激光加工技术是一种不会对金属材料造成严重机械损伤的微加工工具。用这种方法在中碳钢上制造了小型人工起动槽，并进行了疲劳试验。激光影响区出现在切口边缘，但裂纹是从切口尖端开始并稳定地扩展的。裂缝路径非常曲折，就像天然的小裂缝。实验结果表明，飞秒激光加工技术有助于引入小缺口，并允许系统地研究微裂纹行为。
Since small crack propagation behavior is strongly affected by microstructure, very small artificial notches with a length in the submillimeter range are needed for a systematic study of microcrack behavior. Laser processing technique with ultrashort pulses is a micromachining tool which will not cause any serious mechanical damage in metallic materials. Small artificial starter notches were manufactured in medium carbon steels with this technique and some fatigue tests were carried out. Laser affected zones could be observed at the notch boundary but cracks were initiated from the notch tips and propagated steadily. The crack paths were very tortuous like natural small cracks. The experimental results showed that the femtosecond laser processing technique is useful to introduce a small notch and allows systematic investigation of microcrack behavior.