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Proceedings Paper

Material Stress Inspection By Digital Thermographic Image Processing
Author(s): R . A . Fiorini; P. Coppa; O. Salvatore
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Paper Abstract

Within the elastic range, a body subjected to tensile or compressive stresses experiences a reversible conversion between mechanical and thermal form of energy. If adiabatic conditions are maintained, the relationship between reversible temperature change and the corresponding change in the sum of the principal stresses is linear and independent of loading frequency. The inspection of the thermoelastic effect on spot weldings using infrared-based systems can give significant data for non destructively evaluation of welding defects. A specimen was first modeled by Finite Element Technique and then tested on an MTS unit monitored by an infrared camera. A digital image processing computer facility was used to compare sequences of images to investigate the dynamic behaviour of the temperature differences. Theo-retical and experimental results are compared.

Paper Details

Date Published: 19 December 1985
PDF: 9 pages
Proc. SPIE 0575, Applications of Digital Image Processing VIII, (19 December 1985); doi: 10.1117/12.966510
Show Author Affiliations
R . A . Fiorini, Department of Energetics - Politecnico di Milano (Italy)
P. Coppa, Fiat Research Center (Italy)
O. Salvatore, Fiat Research Center (Italy)

Published in SPIE Proceedings Vol. 0575:
Applications of Digital Image Processing VIII
Andrew G. Tescher, Editor(s)

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