Determining individual stresses thermoelastically

Abstract

Thermoelastic stress analysis (TSA, thermoelasticity) uses an infrared radiometer to measure local temperature fluctuations and relates these changes to variations in the stresses or strains in a material by thermodynamic principles. The recorded TSA signal is associated with a combination of the individual stress components. However, engineering analyses typically necessitate knowing the values of the individual stress components, and so it is necessary to 'separate the stresses'. The various approaches that have been used to evaluate the individual components of stress from the TSA-measured information are reviewed and compared, and some areas potentially worthy of further research are indicated.

Processing of Results From a Thermal Fem Analysis Using the Lock-in Method and Comparison With Experiment

“…Using a camera in the 3-5 um (MWIR) wavelength range with an InSb detector, it is possible to detect events with microsecond integration times. This can be used to detect the occurrence of fast events, for example, Lüders bands [1][2][3], when synchronizing the camera with exciting harmonic loading events, which is useful in thermoelastic analysis (TSA) [4,5], in determining the dissipative energy estimation in fatigue tests [6,7,8], determining crack size [9], in the analysis of vibration and determination of resonance frequencies and modal shapes [10,11].…”

A thermography-based approach for structural analysis and fatigue evaluation

“…The beginnings and early development of the TSA were reviewed by Stanley [8]. There are rapid and continuing advances and new applications for the TSA both in the theoretical research and the engineering applications [9][10][11][12]. A review of the TAS and its latest developments has been presented by Greene et al [13].…”