MECHANICAL AND THERMAL EFFECTS IN A STEEL PLATE IMPACTED BY A FOCUSED LASER PULSE
作者:
K. E. FÄLLSTRÖM,
N. E. MOLIN,
K. OLOFSSON,
S. SCHEDIN,
A. WÅHLIN,
期刊:
Nondestructive Testing and Evaluation
(Taylor Available online 1997)
卷期:
Volume 13,
issue 5
页码: 293-307
ISSN:1058-9759
年代: 1997
DOI:10.1080/10589759708953035
出版商: Taylor & Francis Group
关键词: Laser generated impulse in plates;bending waves;sound waves;transients;holographic interferometry;NDT;thermal deformation;impact phenomena
数据来源: Taylor
摘要:
A short laser pulse from a 1 J ruby laser is focused at a steel plate. The effect will be that the material surface at the impact point becomes very rapidly heated. Metal vapour leaves the surface at a very high velocity. That is, both a mechanical impulse and local thermal energy are transferred to the plate. The mechanical impulse creates propagating bending waves in the plate, which in turn creates transient sound waves in the surrounding air. The heated spot at the plate surface creates thermal stresses in the plate which g\ve rise to an out-of-plane deformation of the plate. This deformation is added up to the propagating bending waves. These effects are studied in experiments using pulsed holographic interferometry.
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