Modeling and microstructure analysis of fatigue initiation life extension by reductions in microporosity

Autor:	A. F. Grandt, J. H. Elsner, E. P. Kvam
Rok vydání:	1997
Předmět:	Materials science Structural material Metallurgy Metals and Alloys chemistry.chemical_element Fracture mechanics Fractography Condensed Matter Physics Microstructure chemistry Mechanics of Materials Aluminium Metallography Porosity Stress intensity factor
Zdroj:	Metallurgical and Materials Transactions A. 28:1157-1167
ISSN:	1543-1940 1073-5623
Popis:	Fatigue initiation lifetimes were demonstrated to be related to the size and density of microporosity in the midplate region for three differently processed variations of aluminum alloy 7050-T7451. Metallographic and fractographic examination of double edge notched fatigue specimens was performed to characterize microstructural inhomogeneities. A greater size and density of micropores were found for those materials that had failed at shorter fatigue lifetimes. The specific crack-initiating feature was identified for each of the known cracks. Linear elastic fracture mechanics modeling of crack initiation from each of the micropore-induced cracks showed that this could be adequately accounted for by a stress intensity factor analysis proposed by Trantina and Barishpolsky.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::40c28313473aa781a6186fa73fa9841c https://doi.org/10.1007/s11661-997-0281-5 Zobrazit plný text záznamu Full text from SpringerLink