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| 1. |
EFFECT OF BORON CARBIDE COMPOSITION IN SiC/B4C COMPOSITE ON SURFACE TEMPERATURE DECAY AS REVEALED BY THERMAL WAVE METHOD |
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Nondestructive Testing and Evaluation,
Volume 13,
Issue 5,
1997,
Page 239-245
M.M. MOKSIN,
V.I. GROZESCU,
Z.A. WAHAB,
W.M.M. YUNUS,
B.Z. AZMI,
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PDF (185KB)
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摘要:
We report the results of a thermal wave study on SiC/B4C composites of different B4C compositions. Thermal wave, generated subsequent to sample absorption of pulse laser, was observed by means of a wide-band infrared detector. The information content of the thermal wave is then analysed by using a least-squares method. Temperature decay time, as measured from thermal wave decay curve, varies with % of B4C in the composites. Up to 50% B4C the decay time was found to vary inversely with thermal diffusivity of the composites as predicted.
ISSN:1058-9759
DOI:10.1080/10589759708953033
出版商:Taylor & Francis Group
年代:1997
数据来源: Taylor
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| 2. |
MEASUREMENTS OF COATING ADHESION STRENGTHS BY TIME-RESOLVED INTERFEROMETRIC MONITORING OF LASER-INDUCED SPALLATION |
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Nondestructive Testing and Evaluation,
Volume 13,
Issue 5,
1997,
Page 247-291
PETER WEISS,
MARKUSW. SIGRIST,
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PDF (1420KB)
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摘要:
A novel scheme for the measurement and characterization of the adhesion strength of solid coatings on solid substrates is being presented. Although the method is presently restricted to purely elastic and isotropic materials, it represents an appealing alternative to standard methods, which are not satisfactory in many respects. Our technique is based on laser-induced spallation of the coatings under test, combined with an interferometric monitoring of the spallation process that is manifest in the time-dependence of the surface displacement of the coating.
ISSN:1058-9759
DOI:10.1080/10589759708953034
出版商:Taylor & Francis Group
年代:1997
数据来源: Taylor
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| 3. |
MECHANICAL AND THERMAL EFFECTS IN A STEEL PLATE IMPACTED BY A FOCUSED LASER PULSE |
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Nondestructive Testing and Evaluation,
Volume 13,
Issue 5,
1997,
Page 293-307
K. E. FÄLLSTRÖM,
N. E. MOLIN,
K. OLOFSSON,
S. SCHEDIN,
A. WÅHLIN,
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PDF (386KB)
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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.
ISSN:1058-9759
DOI:10.1080/10589759708953035
出版商:Taylor & Francis Group
年代:1997
数据来源: Taylor
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