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International audience; Infrared thermography is a non-destructive test method based on infrared measurement that provides a luminance map of the thermal scene observed, converting to temperature. The thermographic study allows a surface observation of the thermal effects in order to display the result as a film of the temperature distribution [1]. The present study focuses on the detection of volumetric energy sources in beams covered by viscoelastic patches.

This paper presents the results of thermo-mechanical characterization of Glass/Epoxy composite specimens using Infrared Thermography technique. The specimens used for the study were fabricated in-house with three different lay-up sequences and tested on a servo hydraulic machine under uni-axial loading. Infrared Camera was used for on-line monitoring surface temperature changes of composite specimens during tensile deformation. Experimental results showed that thermomechanical characteristics of each type of specimens were distinct. Temperature was found to be decreasing linearly with increasing tensile stress in the elastic region due to thermo-elastic effect. Yield point could be observed by monitoring the change in temperature profile during tensile testing and this value could be correlated with the results obtained from stress-strain response. The extent of prior plastic deformation in the post-yield region influenced the slopes of temperature response during tensile loading. Partial unloading and reloading of specimens post-yield results in change in slope in elastic and plastic regions of composite specimens., {"references":["Dunn SA, \"Separation of strain components in composite materials from\nthermoelastic temperature measurements\", J. Appl. Mech. 60, 443-448,\n1991.","EI-Hajjar RF and Haj-Ali RM, \"Aquantitative thermoelastic stress\nanalysis method for pultruded composites\", Comp. Sci. and\nTech.63.967-978, 2003.","Lee HT and Chen JC, \"Temperature effect induced by uniaxial tensile\nloading\", J.Mater.Science, 26, 5685-5692, 1991.","Lindhagen JE and Berglund L A, \"Temperature changes in polymer\ncomposites during tensile loading\"J.Mater.Science.32, 4071-4076, 1997.","Zhang D, Enke NF and Sandor BI, \"Thermographic stress analysis of\ncomposite materials\", Exp.Mech.68-73, 1990.","Dunn SA, \"Analysis of thermal conduction effects on thermoelastic\ntemperature measurements for composite materials\", J.Appl.Mech.60,\n443-448,1991","Patil.P. Thiyagarajan K, Prakash VP and Balasubramaniam K, \"Damage\ncharacterization in SS 304 due to monotonic loading using infrared\nthermography\", Int.J Adv.Manuf.Technol.special issue,2008.","Bakis CE and Reifsnider KL, \"The adiabatic thermoelastic effect in\nlaminated fiber composites\", J.Compos.Mater.25, 809-30, 1991.","Wong AK, \"A non-adiabatic thermoelastic theory for composite\nlaminates\", J Phys Chem Solid, 52,483-94, 1991.\n[10] Cunningham PR, Dalieu-Barton JM, Dutton AG and Shenoi RA, \"The\neffect of ply lay-up on the thermoelastic response of laminated\ncomposites\", Key Eng Mater, 221-222,325-36, 2002.\n[11] Emery TR, Dalieu-Barton JM, Earl JS and Cunningham PR,\"A\ngeneralised approach to the calibration of orthotropic materials for\nthermoelastic stress analysis \", Comp Sci Technol, 63(7),967-78,2003.\n[12] Tsai SW, \"Strength characteristics of composite materials\", NASA CR-\n224, April 1965.\n[13] Chung K and Ryou H, \"Development of viscoelastic/rate-sensitiveplastic\nconstitutive law for fiber-reinforced composites and its\napplications. Part 1: Theory and material characterization\", Comp. Sci.\ntech.69, 284-291, 2009.\n[14] Heubert H, Schulte K and Harig, \"Composite materials: Testing and\ndesign\",Vol.9,edited by S.P.Garbo (ASTM-STP 0066-1058;1059) p.435\n[15] Toubal L, Karama M and Lorrain B, \"Damage Evolution and Infrared\nThermography in Woven Composite Laminates Under Fatigue Loading\",\nInt. J. of Fatigue, Vol. 28, 2006 p. 1867 - 1872"]}