Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels

François Maquin; Fabrice Pierron

doi:10.1016/j.crme.2007.02.004

Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels

Presented by: André Zaoui

François Maquin ¹ ; Fabrice Pierron ¹

¹ Laboratoire de mécanique et procédés de fabrication (LMPF), École nationale supérieure d'arts et métiers, rue St Dominique, BP 508, 51006 Châlons-en-Champagne cedex, France

Comptes Rendus. Mécanique, Volume 335 (2007) no. 3, pp. 168-174.

Abstract
Résumé

The present study is aimed at studying the heat generated in steel specimens cyclically tested at stresses lower than their macroscopic elastic limit, in the objective of detecting the onset of microplasticity. First, the data processing procedure is presented to calculate heat sources and thermal energy levels from temperature maps. Then, a sensitivity study is performed to establish the smallest energy value that can be detected above noise. Finally, results are presented for a cold rolled low carbon steel material. It is shown that two main mechanisms of dissipation are present, the first one corresponding to viscoelastic effects and the second one associated to microplasticity.

Cette étude traite de la mesure de l'énergie dissipée sous forme de chaleur au sein d'éprouvettes d'un acier bas carbone laminé à froid, testées cycliquement à des niveaux de contrainte inférieurs à sa limite d'élasticité macroscopique, dans l'objectif de déterminer sa limite de microplasticité. Dans un premier temps, la procédure de traitement des données est présentée, permettant de calculer les sources de chaleur et l'énergie dissipée à partir des mesures de température. Ensuite, une étude du bruit de mesure est présentée. Finalement, on met en évidence deux phénomènes dissipatifs : le premier correspondant à de la viscoélasticité et le second associé à la microplasticité.

Received: 2006-08-21
Accepted: 2007-02-06
Published online: 2007-03-01

DOI: 10.1016/j.crme.2007.02.004

Keywords: Heat transfer, Heat dissipation, Cyclic loading, Thermomechanical behaviour
Mots-clés : Transferts thermiques, Dissipation de chaleur, Essais cycliques, Thermomécanique

Author's affiliations:

François Maquin ¹; Fabrice Pierron ¹

¹ Laboratoire de mécanique et procédés de fabrication (LMPF), École nationale supérieure d'arts et métiers, rue St Dominique, BP 508, 51006 Châlons-en-Champagne cedex, France

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     author = {Fran\c{c}ois Maquin and Fabrice Pierron},
     title = {Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {168--174},
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     language = {en},
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François Maquin; Fabrice Pierron. Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels. Comptes Rendus. Mécanique, Volume 335 (2007) no. 3, pp. 168-174. doi : 10.1016/j.crme.2007.02.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.02.004/

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