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Thermomechanical Studies in Glass/Epoxy Composite Specimen during Tensile Loading

Authors: K. M. Mohamed Muneer, Raghu V. Prakash, Krishnan Balasubramaniam


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.

Keywords: infrared thermography, Glass/Epoxy composites, Thermomechanical behavior, Thermoelastic slope, Thermoplastic slope

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[1] Dunn SA, "Separation of strain components in composite materials from thermoelastic temperature measurements", J. Appl. Mech. 60, 443-448, 1991.
[2] EI-Hajjar RF and Haj-Ali RM, "Aquantitative thermoelastic stress analysis method for pultruded composites", Comp. Sci. and Tech.63.967-978, 2003.
[3] Lee HT and Chen JC, "Temperature effect induced by uniaxial tensile loading", J.Mater.Science, 26, 5685-5692, 1991.
[4] Lindhagen JE and Berglund L A, "Temperature changes in polymer composites during tensile loading"J.Mater.Science.32, 4071-4076, 1997.
[5] Zhang D, Enke NF and Sandor BI, "Thermographic stress analysis of composite materials", Exp.Mech.68-73, 1990.
[6] Dunn SA, "Analysis of thermal conduction effects on thermoelastic temperature measurements for composite materials", J.Appl.Mech.60, 443-448,1991
[7] Patil.P. Thiyagarajan K, Prakash VP and Balasubramaniam K, "Damage characterization in SS 304 due to monotonic loading using infrared thermography", Int.J Adv.Manuf.Technol.special issue,2008.
[8] Bakis CE and Reifsnider KL, "The adiabatic thermoelastic effect in laminated fiber composites", J.Compos.Mater.25, 809-30, 1991.
[9] Wong AK, "A non-adiabatic thermoelastic theory for composite laminates", J Phys Chem Solid, 52,483-94, 1991.
[10] Cunningham PR, Dalieu-Barton JM, Dutton AG and Shenoi RA, "The effect of ply lay-up on the thermoelastic response of laminated composites", Key Eng Mater, 221-222,325-36, 2002.
[11] Emery TR, Dalieu-Barton JM, Earl JS and Cunningham PR,"A generalised approach to the calibration of orthotropic materials for thermoelastic stress analysis ", Comp Sci Technol, 63(7),967-78,2003.
[12] Tsai SW, "Strength characteristics of composite materials", NASA CR- 224, April 1965.
[13] Chung K and Ryou H, "Development of viscoelastic/rate-sensitiveplastic constitutive law for fiber-reinforced composites and its applications. Part 1: Theory and material characterization", Comp. Sci. tech.69, 284-291, 2009.
[14] Heubert H, Schulte K and Harig, "Composite materials: Testing and design",Vol.9,edited by S.P.Garbo (ASTM-STP 0066-1058;1059) p.435
[15] Toubal L, Karama M and Lorrain B, "Damage Evolution and Infrared Thermography in Woven Composite Laminates Under Fatigue Loading", Int. J. of Fatigue, Vol. 28, 2006 p. 1867 - 1872