[Méthodologie fine de détermination de la chaleur dissipée dans un matériau chargé cycliquement à faible contrainte]
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.
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.
Accepté le :
Publié le :
Mot clés : Transferts thermiques, Dissipation de chaleur, Essais cycliques, Thermomécanique
@article{CRMECA_2007__335_3_168_0,
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},
publisher = {Elsevier},
volume = {335},
number = {3},
year = {2007},
doi = {10.1016/j.crme.2007.02.004},
language = {en},
}
TY - JOUR AU - François Maquin AU - Fabrice Pierron TI - Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels JO - Comptes Rendus. Mécanique PY - 2007 SP - 168 EP - 174 VL - 335 IS - 3 PB - Elsevier DO - 10.1016/j.crme.2007.02.004 LA - en ID - CRMECA_2007__335_3_168_0 ER -
%0 Journal Article %A François Maquin %A Fabrice Pierron %T Refined experimental methodology for assessing the heat dissipated in cyclically loaded materials at low stress levels %J Comptes Rendus. Mécanique %D 2007 %P 168-174 %V 335 %N 3 %I Elsevier %R 10.1016/j.crme.2007.02.004 %G en %F CRMECA_2007__335_3_168_0
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/
[1] Measuring the actual endurance limit of one specimen using a nondestructive method, Journal of Engineering Materials and Technology (ASME), Volume 103 (1981) no. 1, pp. 71-76
[2] Fatigue limit evaluation of metals using an infrared thermographic technique, Mechanics of Materials, Volume 28 (1998), pp. 155-163
[3] Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components, International Journal of Fatigue, Volume 22 (2000), pp. 65-73
[4] A new method for the thermographic determination of fatigue limit in steels, International Journal of Fatigue, Volume 27 (2005), pp. 453-459
[5] Comportement mécanique des matériaux solides, Hermès (1995), pp. 217-218
[6] Calorimetric analysis of dissipative and thermoelastic effects associated with the fatigue behavior of steels, International Journal of Fatigue, Volume 26 (2004) no. 3, pp. 221-229
[7] Thermal and dissipative effects accompanying Lüders band propagation, Materials Science and Engineering A, Volume 307 (2001) no. 1–2, pp. 15-22
[8] F. Maquin, Méthodologie expérimentale d'étude du comportement thermo-mécanique des matériaux sous sollicitations cycliques, PhD thesis, ENSAM, France, 2006
[9] R. Moulart, R. Rotinat, F. Pierron, G. Lerondel, Optical full-field measurement of strain at a microscopic scale with the grid method, in: Speckle 06, 2006, 13–15 September, Nîmes, France
Cité par Sources :
Commentaires - Politique
Martin Poncelet; Cédric Doudard; Sylvain Calloch; ...
C. R. Méca (2007)
Identification of the scatter in high cycle fatigue from temperature measurements
Cédric Doudard; Sylvain Calloch; François Hild; ...
C. R. Méca (2004)
Estimation of the mesoscopic thermoplastic dissipation in High-Cycle Fatigue
Eric Charkaluk; Andrei Constantinescu
C. R. Méca (2006)