The infrared thermography has been developed for Non-Destructive Testing (NDT), stress analysis, and in the last 10 years for metal fatigue assessment. The present research enables to realize these different research objectives all together thanks to an innovative experimental procedure, which includes NDT by lock-in thermography, thermoelastic stress analysis, and fatigue parameters assessment by Rapid Thermographic Method (RTM). The developed procedure has been performed on a set of hole-notched specimens, achieving good results and predictions in a relatively short time. Moreover, the fatigue strength reduction coefficients of the specimens were determined by RTM. This thermography-based approach is dedicated for structural analysis and fatigue evaluation; it is an interesting attempt to apply different thermographic methods to a common research topic.
MaldagueX.Non-destructive evaluation of materials by infrared thermography1993 (Springer Verlag, London).
2.
MaldagueX.MarinettiS.Pulse phase thermography. J. Appl. Phys., 1996, 79, 2694–2698.
3.
SakagamiT.KuboS.Applications of pulse heating thermography and LT to quantitative nondestructive evaluations. Infrared Phys. Technol., 2002, 43, 211–218.
4.
CarlomagnoG. M.BerardiP. G.Unsteady thermotopography in non-destructive testing. In Proceedings of the III Infrared Information Exchange, St. Louis, Missouri, USA, 24–26 August1976, pp. 33–39.
5.
BusseG.WuD.KarpenW.Thermal wave imaging with phase sensitive modulated thermography. J. Appl. Phys., 1992, 71(8), 3962–3965.
6.
MeolaC.CarlomagnoG. M.SquillaceA.GiorleoG.Non-destructive control of industrial materials by means of LT. Meas. Sci. Technol., 2002, 13, 1583–1590.
7.
MeolaC.CarlomagnoG. M.SquillaceA.GiorleoG.The use of infrared thermography for non-destructive evaluation of joints. Infrared Phys. Technol., 2004, 46, 93–99.
8.
StanleyP.Beginnings and early development of thermoelastic stress analysis. Strain, 2008, 44, 285–297.
GreeneR. J.PattersonE. A.RowlandsR. E.Thermoelastic stress analysis. Handbook of Experimental Solid Mechanics, Part C, 2008 (Springer, New York).
14.
AudeninoA. L.CrupiV.ZanettiE. M.Thermoelastic and elastoplastic effects measured by means of a standard thermocamera. Exp. Tech., 2004, 28, 23–28.
15.
MorabitoA. E.ChrysochoosA.DattomaV.GaliettiU.Analysis of heat sources accompanying the fatigue of 2024 T3 aluminium alloys. Int. J. Fatigue, 2007, 29, 977–984.
16.
ChrysochoosA.BerthelB.LatourteF.PaganoS.WattrisseB.WeberB.Local energy approach to steel fatigue. Strain, 2008, 44(4), 327–334.
17.
CharkalukE.ConstantinescuA.Dissipative aspects in high cycle fatigue. Mech. Mater., 2009, 41(5), 483–494.
18.
ConnessonN.MaquinF.PierronF.Experimental energy balance during the first cycles of cyclically loaded specimens under the conventional yield stress. Exp. Mech., 2011, 51, 23–44.
19.
MeneghettiG.Analysis of the fatigue strength of a stainless steel based on the energy dissipation. Int. J. Fatigue, 2006, 29, 81–94.
20.
La RosaG.RisitanoA.Thermographic methodology for the rapid determination of fatigue limit of materials and mechanical components. Int. J. Fatigue, 2000, 22, 65–73.
21.
FargioneG.GeraciA.La RosaG.RisitanoA.Rapid determination of the fatigue curve by the thermographic method. Int. J. Fatigue, 2002, 24, 11–19.
22.
ClientiC.FargioneG.La RosaG.RisitanoA.RisitanoG.A first approach to the analysis of fatigue parameters by thermal variations in static tests on plastics. Eng. Fract. Mech., 2010, 77, 2158–2167.
23.
CrupiV.GuglielminoE.RisitanoA.TaylorD.Different methods for fatigue assessment of T welded joints used in ship structures. J. Ship. Res., 2007, 51, 150–159.
24.
CrupiV.GuglielminoE.MaestroM.MarinòA.Fatigue analysis of butt welded AH36 steel joints: Thermographic Method and design S-N curve. Mar. Struct., 2009, 22, 373–386.
25.
CrupiV.An Unifying Approach to assess the structural strength. Int. J. Fatigue, 2008, 30, 1150–1159.
26.
WangX. G.CrupiV.GuoX. L.ZhaoY. G.Quantitative thermographic methodology for fatigue assessment and stress measurement. Int. J. Fatigue, 2010, 32, 1970–1976.
27.
DengelD.HarigH.Estimation of the fatigue limit by progressively–increasing load tests. Fatigue Fract. Eng. Mater. Struct., 1980, 3, 113–128.
28.
LuongM. P.Fatigue limit evaluation of metals using an infrared thermographic technique. Mech. Mater., 1998, 28, 155–163.
29.
KrapezJ. C.PacouD.GardetteG.Lock-in thermography and fatigue limit of metals. In Proceedings of the Fifth International Conference on Quantitative infrared thermography (QIRT 2000), Reims, France, 8–21 July2000, pp. 277–282.
30.
CuràF.CurtiG.SesanaR.A new iteration method for the thermographic determination of fatigue limit in steels. Int. J. Fatigue, 2007, 27, 453–459.
31.
AmiriM.KhonsariM. M.Rapid determination of fatigue failure based on temperature evolution: Fully reversed bending load. Int. J. Fatigue, 2010, 32, 382–389.
32.
WuD.SalernoA.SchonbachB.HallinH.BusseG.Phase sensitive modulation thermography and its applications for NDE. In Proceedings of the Thermosense XIX: An International Conference on Thermal sensing and imaging diagnostic applications, vol. 3056, Orlando, Florida, USA, 22–25 April1997, pp. 176–183.
33.
AlmondD.PatelP.Photothermal science and techniques (physics and its application)1996 (Chapman & Hall, London).
34.
CrupiV.ChiofaloG.GuglielminoE.Using infrared thermography in low-cycle fatigue studies of welded joints. Weld. J., 2010, 89, 195–200.
35.
DowlingN. E.Engineering methods for deformation, fracture and fatigue. Mechanical behavior of materials, 1998 (Prentice-Hall Inc, Englewood Cliffs, New Jersey).
