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Determination of the fatigue limit of a carbon/epoxy composite using thermographic analysis
Author(s) -
Karama Moussa
Publication year - 2011
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.485
Subject(s) - dimensioning , structural engineering , fatigue limit , dissipation , vibration fatigue , stress (linguistics) , limit (mathematics) , composite number , dispersion (optics) , materials science , thermography , computer science , fatigue testing , mathematics , composite material , infrared , engineering , mathematical analysis , physics , optics , linguistics , philosophy , thermodynamics , aerospace engineering
ABSTRACT The dimensioning of structures depends on the nature of the loading to which they are subjected. Load may be constant or, more generally, variable over the course of time. Take, for example, automobile suspension parts or the wings of a plane; their degree of stress in use varies. In fact, the phenomenon of fatigue concerns each object which surrounds us, and repeated use leads to their deterioration. Repetitive use and loading levels are determining parameters with regard to the lifespan of these elements, i.e. the period during which they function correctly. The main reason mechanics lack motivation for fatigue testing is the high cost of such tests. This is due, amongst other things, to the particularly dispersive character of the fatigue phenomenon and to the duration of the tests themselves. For each type of experimental checking in fatigue, this wide dispersion makes a considerable number of tests necessary in order to obtain representative results. Following up damage to the specimens according to the number of cycles in order to quantify the lifespan of the material was done using an infrared camera to evaluate the variation in temperature during the fatigue test. An approach to fatigue damage mechanisms, based on the treatment of dissipation images, is given. The endurance limit, obtained by energy method, is also shown. Copyright © 2011 John Wiley & Sons, Ltd.