TY - JOUR
T1 - Initiation and propagation behavior of fatigue cracks in 5056 aluminum alloy studied by rotation-bending tests with smooth specimen
AU - Shikama, Takahiro
AU - Yoshihara, Shinji
AU - Aiura, Tadashi
AU - Lee, Dongsun
AU - Noguchi, Hiroshi
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2010/7
Y1 - 2010/7
N2 - Fatigue properties of 5056 aluminum alloy, which is the most Mg-rich alloy among commercial Al-Mg alloys, and exhibits significant work hardening and strain aging, was investigated. RotationBending tests with smooth specimen were performed at room temperature, with stress ratio R= -1 and frequency of stress cycle f= 55 Hz. The experimental results showed that a clear fatigue limit like in case of a steel existed on the S-N curve. Surface observation with the replica method revealed a wavy pattern around the second phase particle for N= 106-107, but no non-propagation crack were observed. It was speculated that the observed fatigue limit appeared as a result of marked work hardening and strain aging at the heavily deformed zone, and fatigue cracks did not initiate from the zone at up to the maximum number of stress cycle, N= 3.5×107, employed in the present study.
AB - Fatigue properties of 5056 aluminum alloy, which is the most Mg-rich alloy among commercial Al-Mg alloys, and exhibits significant work hardening and strain aging, was investigated. RotationBending tests with smooth specimen were performed at room temperature, with stress ratio R= -1 and frequency of stress cycle f= 55 Hz. The experimental results showed that a clear fatigue limit like in case of a steel existed on the S-N curve. Surface observation with the replica method revealed a wavy pattern around the second phase particle for N= 106-107, but no non-propagation crack were observed. It was speculated that the observed fatigue limit appeared as a result of marked work hardening and strain aging at the heavily deformed zone, and fatigue cracks did not initiate from the zone at up to the maximum number of stress cycle, N= 3.5×107, employed in the present study.
UR - http://www.scopus.com/inward/record.url?scp=77957313207&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957313207&partnerID=8YFLogxK
U2 - 10.1299/kikaia.76.928
DO - 10.1299/kikaia.76.928
M3 - Article
AN - SCOPUS:77957313207
SN - 0387-5008
VL - 76
SP - 928
EP - 937
JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
IS - 767
ER -