Quantitative Thermographic Methodology for fatigue assessment and stress measurement

An energy method for rapid evaluation of high-cycle fatigue parameters based on intrinsic dissipation

“…Most of the dissipated energy is converted into heat inducing temperature change. Many experiments have indicated that the surface temperature of a specimen or a component, subjected to fatigue load above its fatigue limit and below its yield limit, is well defined by three phases, including (I) initial temperature increase phase, (II) temperature stabilization phase, and (III) abrupt temperature increase phase before fatigue failure [18], as shown in Fig. 1.…”

Deformation-induced dissolution and growth of precipitates in an Al–Mg–Er alloy during high-cycle fatigue

“…When the applied stresses were below the fatigue limit of materials, the temperature increase during fatigue tests was extremely limited [30]. For instance, thermographic methodology experiments estimated that the temperature rise in samples was no more than 15 K for fatigue assessments [31,32]. Since the quasi-in situ fatigue, experiments were conducted at room temperature, $293 K, the effect of temperature rise on Al 3 (Er, Zr) precipitates was studied by aging a bulk undeformed Al-Mg-Er alloy at 318 K for 48 h. A TEM thin-foil specimen was prepared from the aged alloy, and the mean size of Al 3 (Er, Zr) precipitates was determined from HAADF STEM images as 20.5 ± 0.2 nm.…”

Infrared thermography coupled with digital image correlation in studying plastic deformation on the mesoscale level

“…One of the very interesting issues associated with energy dissipation is that it is usually a very sensitive indicator of the microstructure evolution [1][2][3][4][5][6]. The idea of using heat release to study the thermomechanical behaviour of materials can date back to the 1930s.…”