Abstract
This paper aims to illustrate the use of infrared thermography as a non-destructive and non-contact technique to observe the phenomenological manifestation of damage in granite under unconfined compression. It allows records and observations in real time of heat patterns produced by the dissipation of energy generated by plasticity. The experimental results show that this technique, which couples mechanical and thermal energy, can be used for illustrating the onset of damage mechanism by stress concentration in weakness zones.
Highlights
C urrent technological developments tend towards increased exploitation of material strengths and towards tackling extreme loads and environmental actions
This paper aims to illustrate the use of infrared thermography as a non-destructive and non-contact technique to observe the phenomenological manifestation of damage in granite under unconfined compression
A different approach has been proposed using the plasticity formalism with the concept of a fracturing stress or a fracturing strain to describe the inelastic behavior of progressively fracturing solids [2]
Summary
C urrent technological developments tend towards increased exploitation of material strengths and towards tackling extreme loads and environmental actions. In cases where continuum mechanics can be applied, the concept of an effective stress ef = /(1- ) has been introduced with a continuous variable related to the scalar density of defects or faults This has been the starting point of damage theories developed for fatigue, creep, and creep-fatigue interaction in engineering materials. The volumetric heat capacity C = Cv of the material is the energy required to raise the temperature of a unit volume by 1°C (or 1 Kelvin) This coupled thermomechanical equation suggests the potential applications of the infrared scanning technique in diverse engineering domains [8-10]: detection of fluid leakage, non-destructive testing using thermal conduction phenomena, elastic stress measurements, and localization of dissipative phenomena. This analysis is the principal difficulty when interpreting the thermal images obtained from experiments under the usual conditions.
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