TY - JOUR
T1 - Unforeseen, negative interaction-effect of adjacent circumferential notches on the fatigue limit of Ni-based superalloy 718
AU - Okazaki, Saburo
AU - Okuma, Satoshi
AU - Kevinsanny,
AU - Ogawa, Yuhei
AU - Kawashima, Hideto
AU - Funakoshi, Yusuke
AU - Matsunaga, Hisao
N1 - Funding Information:
This study formed part of a collaborative research project between the Japan Aerospace Exploration Agency (JAXA) and Kyushu University.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/11
Y1 - 2021/11
N2 - Investigations were conducted on the interaction-effects of adjacent, circumferential V-notches on the fatigue limit of Alloy 718, with the aid of fully-reversed, tension–compression fatigue tests. Contrary to expectation, specimen with seven adjacent circumferential notches had lower fatigue limit than that with a single circumferential notch. This phenomenon was attributed to the increased stress intensity factor (SIF) range of shear-mode fatigue cracks at notch-roots, resulting from competition between two factors: (i) stress mitigation through the mechanistic interaction of notches (decreased SIF) and (ii) the orderly, spatial alignment of crack-planes, due to the asymmetric stress-fields in the vicinity of notch-roots (increased SIF).
AB - Investigations were conducted on the interaction-effects of adjacent, circumferential V-notches on the fatigue limit of Alloy 718, with the aid of fully-reversed, tension–compression fatigue tests. Contrary to expectation, specimen with seven adjacent circumferential notches had lower fatigue limit than that with a single circumferential notch. This phenomenon was attributed to the increased stress intensity factor (SIF) range of shear-mode fatigue cracks at notch-roots, resulting from competition between two factors: (i) stress mitigation through the mechanistic interaction of notches (decreased SIF) and (ii) the orderly, spatial alignment of crack-planes, due to the asymmetric stress-fields in the vicinity of notch-roots (increased SIF).
UR - http://www.scopus.com/inward/record.url?scp=85116536224&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85116536224&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2021.108015
DO - 10.1016/j.engfracmech.2021.108015
M3 - Article
AN - SCOPUS:85116536224
SN - 0013-7944
VL - 257
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
M1 - 108015
ER -