MODELING AND MICROSTRUCTURE ANALYSIS OF FATIGUE INITIATION LIFE EXTENSION BY REDUCTIONS IN MICROPOROSITY

Authors
ELSNER JH KVAM EP GRANDT AF
Citation
Jh. Elsner et al., MODELING AND MICROSTRUCTURE ANALYSIS OF FATIGUE INITIATION LIFE EXTENSION BY REDUCTIONS IN MICROPOROSITY, Metallurgical and materials transactions. A, Physical metallurgy andmaterials science, 28(5), 1997, pp. 1157-1167
Citations number
26
Categorie Soggetti
Metallurgy & Metallurigical Engineering","Material Science
Journal title
Metallurgical and materials transactions. A, Physical metallurgy andmaterials science → ACNP
ISSN journal
10735623
Volume
28
Issue
5
Year of publication
1997
Pages
1157 - 1167
Database
ISI
SICI code
1073-5623(1997)28:5<1157:MAMAOF>2.0.ZU;2-C
Abstract
Fatigue initiation lifetimes were demonstrated to be related to the si ze and density of microporosity in the midplate region for three diffe rently processed variations of aluminum alloy 7050-T7451. Metallograph ic and fractographic examination of double edge notched fatigue specim ens was performed to characterize microstructural inhomogeneities. A g reater size and density of micropores were found for those materials t hat had failed at shorter fatigue lifetimes. The specific crack-initia ting feature was identified for each of the known cracks. Linear elast ic fracture mechanics modeling of crack initiation from each of the mi cropore-induced cracks showed that this could be adequately accounted for by a stress intensity factor analysis proposed by Trantina and Bar ishpolsky.