A new experimental method (IIC, Infrared Image Correlation) for quick assessment of the coefficients of thermal expansion of solid materials is presented. The proposed method is based on performing a digital image correlation between thermal images acquired at different temperatures by means of an infrared camera. It allows the coefficient of thermal expansion of both isotropic and anisotropic bulk materials to be determined by measuring simultaneously the fractional increase in length and the actual thermal field over a small region of interest in which a dual-emissivity stochastic speckle pattern has been created. First results reported in this paper prove the effectiveness of the proposed method that can be applied either to carry out reference measurements in laboratory or to evaluate thermal stresses and strains on structural components in-field.
A new method for the determination of the coefficient of thermal expansion of solid materials
MONTANINI, Roberto;FRENI, FABRIZIO
2012-01-01
Abstract
A new experimental method (IIC, Infrared Image Correlation) for quick assessment of the coefficients of thermal expansion of solid materials is presented. The proposed method is based on performing a digital image correlation between thermal images acquired at different temperatures by means of an infrared camera. It allows the coefficient of thermal expansion of both isotropic and anisotropic bulk materials to be determined by measuring simultaneously the fractional increase in length and the actual thermal field over a small region of interest in which a dual-emissivity stochastic speckle pattern has been created. First results reported in this paper prove the effectiveness of the proposed method that can be applied either to carry out reference measurements in laboratory or to evaluate thermal stresses and strains on structural components in-field.Pubblicazioni consigliate
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