AFM Study on Crack Initiation and Growth Behavior in an Extruded Aluminum Alloy 2024-T3

Autor:	Takahito Goshima, Sotomi Ishihara, Hiroshi Shibata, Shinji Saka
Rok vydání:	2005
Předmět:	Materials science Mechanical Engineering Metallurgy Alloy Fracture mechanics engineering.material Crack growth resistance curve Microstructure Stress (mechanics) Crack closure Mechanics of Materials engineering General Materials Science Grain boundary Stress concentration
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A. 71:479-485
ISSN:	1884-8338 0387-5008
DOI:	10.1299/kikaia.71.479
Popis:	In the present study, rotating bending fatigue tests were performed on an extruded aluminum alloy 2024-T3 to study a crack initiation and growth behavior on the smooth un-notched specimen. Effect of microstructure of the material on the crack initiation and growth behavior was also studied using an atomic force microscope, AFM. Small crack with a length of 1-2 μm initiates at grain boundary in the very early stage of fatigue life, N/Nf=6-10%. So the fatigue life is almost considered as a crack propagation life. The initiated crack propagated very slowly along the grain boundary especially at the lower stress amplitude region. The S-N curve can be estimated from an integration of the relation da/dN vs. M, the parameter proposed by authors.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::278b9a6fd8753ae32208279c02c6c766 https://doi.org/10.1299/kikaia.71.479 Zobrazit plný text záznamu