Heat generation during the fatigue of a cellular Al alloy

Citation
A. Rabiei et al., Heat generation during the fatigue of a cellular Al alloy, MET MAT T A, 31(4), 2000, pp. 1129-1136
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN journal
1073-5623 → ACNP
Volume
31
Issue
4
Year of publication
2000
Pages
1129 - 1136
Database
ISI
SICI code
1073-5623(200004)31:4<1129:HGDTFO>2.0.ZU;2-#
Abstract
The heat generation from a notch during the compression-compression fatigue of a cellular Al alloy has been measured and compared with a model. The me asurements indicate that heat is generated because of hysteresis occurring in narrow cyclic plastic zones outside the notch. This process continues un til the notch closes. At closure, a brief period of heat generation arises because of friction along the notch faces. A plasticity model based on the Dugdale zone is shown to provide a reasonably accurate characterization of the heat generated, with the proviso that an ''ineffective" zone be transpo sed onto the notch tip. It is found that the temperatures generated are too small to cause fatigue by thermal softening. A fatigue mechanism based on either geometric softening of the cells or crack growth in the cell walls i s implied.