Journal article
Use of Femtosecond Laser Technique for Studying Physically Small Cracks



Publication Details
Authors:
Motoyashiki, Y.; Brückner-Foit, A.; Englert, L.; Haag, L.; Wollenhaupt, M.; Baumert, T.
Publication year:
2006
Journal:
International Journal of Fracture
Pages range:
561-568
Volume number:
139
Start page:
561
End page:
568
ISSN:
0376-9429

Abstract
Since small crack propagation behavior is strongly affected by microstructure, very small artificial notches with a length in the submillinieter 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.


Keywords
fatigue, femtosecond laser, laser micromachining, physically short crack, small notch

Last updated on 2019-01-11 at 16:05