Examination of the epicentral waveform for laser ultrasound in the melting regime

Journal Article · Fri Mar 01 04:00:00 EST 2013 · Ultrasonics

DOI:https://doi.org/10.1016/j.ultras.2012.11.007· OSTI ID:1077153

Reese, S. J.; Utegulov, Z. N.; Farzbod, F.; Schley, R. S.; Hurley, D. H.

A laser ultrasonic source just below the ablation regime is examined by recording an epicentral waveform in a high purity tungsten sample. Using pulse energy as a parameter, a slight delay in the shear wave arrival time is observed upon transition to the melting regime. This phenomenon is attributed to a change in character of the ultrasonic source. In the thermoelastic regime, shear waves are generated by mode conversion at the sample surface of longitudinal waves emanating from subsurface sources. Just above the melting threshold, a molten pool forms in the center of the generation volume. Shear waves are not supported by the molten pool. As a result, shear waves generated from off-axis thermoelastic sources are weighted more heavily. This results in a delay of the shear wave arrival time.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: DOE - NE
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1077153
• Report Number(s): INL/JOU-12-27599
• Journal Information: Ultrasonics, Journal Name: Ultrasonics Journal Issue: 3 Vol. 53; ISSN 0041-624X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Laser ultrasound
ablation
epicentral waveform
melting point
thermoelastic