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Optodynamic study of multiple pulses micro drillingPetkovšek, Rok, fizik ...This paper describes an analysis of pulsed lasers micro-drilling of different metals. Study focuses to an optodynamic phenomenon which appears as thermal effects induced by laser light pulses and ... leads to dynamic process manifested as ultrasonic shock waves propagating into the sample material. The shock waves are detected by a non-contact optical method by using arm compensated Michelson. Monitoring of the main parameters of the micro drilling such as material ablation rate and efficiency was realized by analysis of the optodynamic signals. The process is characterized by decreasing ablation rate that leads to the finite hole depth. The experimental part of study comprehends a comparison between various metals. In order to describe decreasing ablation rate a theoretical model based on the energy balance is proposed. It considers the energyžheat transfer from the laser beam to the material and predicts a decreasing drilling rate with an increasing number of successive laser pulses. According to the proposed model, the finite depth of the hole appears as a consequence of the increasing surface area through whichthe energy of the laser beam is conducted away to the material around the processed area. Decreasing ablation rate and the finite hole depth predicted by model were in good agreement with the experimental results.Source: Proceedings of Ultrasonics International [also] UI 2005 and World Congress on Ultrasonics [also] WCU : Beijing, China, 29 August-01 September 2005 (Letn. 44, št. Suppl. 1, 2006, str. e1191-e1194)Type of material - conference contributionPublish date - 2006Language - englishCOBISS.SI-ID - 9833755
Author
Petkovšek, Rok, fizik |
Panjan, Igor |
Babnik, Aleš |
Možina, Janez, fizik, 1945-
Topics
odrezavanje |
mikrovrtanje |
kovine |
laserske obdelave |
optodinamika |
teoretični modeli |
optodynamic |
laser |
ablation |
drilling
source: Proceedings of Ultrasonics International [also] UI 2005 and World Congress on Ultrasonics [also] WCU : Beijing, China, 29 August-01 September 2005 (Letn. 44, št. Suppl. 1, 2006, str. e1191-e1194)
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Database name | Field | Year |
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Petkovšek, Rok, fizik | 15646 |
Panjan, Igor | |
Babnik, Aleš | 11905 |
Možina, Janez, fizik, 1945- | 01649 |
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