Thermal and dissipative effects accompanying Lüders band propagation

Hervé Louche (1) , André Chrysochoos (1)

1 LMGC - Laboratoire de Mécanique et Génie Civil

This study deals with an experimental investigation of thermal and calorimetric effects induced by Lu ̈ ders band propagationduring monotonic and quasi-static tensile tests. One grade of steel is considered. Temperature variations were measured with aninfrared camera on the surface of flat samples. Heat sources were deduced from thermal data using the local heat diffusionequation. For elastoplastic materials, when no phase transition occurs, the heat source is essentially due to intrinsic dissipation.The experiments revealed that a dissipation wave accompanied Lu ̈ ders band propagation. Some characteristics of the wave, suchas its shape, orientation and velocity, were derived from the experimental measurements and compared to previously publishedresults. Finally, comparison of the calorimetric and kinematic data revealed a dissipation function proportional to the absolutevalue of the longitudinal plastic strain rate.

Mots clés: Lu¨ders Band Propagation; Thermal And Dissipative Effects; Localization; Infrared thermography; Quasi-static Tensile Tests

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

Hervé Louche, André Chrysochoos. Thermal and dissipative effects accompanying Lüders band propagation. Materials Science and Engineering: A, 2001, 307 (1-2), pp.15-22. ⟨10.1016/S0921-5093(00)01975-4⟩. ⟨hal-03350121⟩