Dissipation measurements in steel sheets under cyclic loading by use of infrared microthermography

Martin Poncelet (1) , Cédric Doudard (2) , Sylvain Calloch (2) , François Hild (1) , Bastien Weber (3)

1 LMT - Laboratoire de Mécanique et Technologie
2 LBMS - Laboratoire brestois de mécanique et des systèmes
3 IRSID - IRSID

Heterogeneous dissipation in steel sheets due to cyclic loading is difficult to measure, especially in the transverse direction because of the high conductivity and low thickness of the sheets. The goal of this article is thus to develop an experimental protocol allowing for the dissipation field determination from infra-red thermography. The protocol is based on a specific differential measurement and an asynchronous acquisition. It reduces measurement artefacts due to coating, rigid body motion, convection, and optical deleterious effects. It is eventually applied to different specimens.

Mots clés: IR thermography; thermoelasticity; dissipation; fatigue properties; surface effect; coating

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Martin Poncelet, Cédric Doudard, Sylvain Calloch, François Hild, Bastien Weber. Dissipation measurements in steel sheets under cyclic loading by use of infrared microthermography. Strain, 2010, 46, pp.101-116. ⟨10.1111/j.1475-1305.2009.00622.x⟩. ⟨hal-00356522⟩