TY - JOUR

T1 - Retardation of Fatigue Crack Growth in Rotating Bending Specimens with Semi-Elliptical Cracks

AU - Leitner, Martin

AU - Simunek, David

AU - Maierhofer, Jürgen

AU - Gänser, Hans-Peter

AU - Pippan, Reinhard

PY - 2019/1/1

Y1 - 2019/1/1

N2 - This work investigates overload-induced retardation effects for semi-elliptically cracked steel round bars. The specimen geometry equals the shaft area of a 1:3 down-scaled railway axle and the material is extracted from railway axle blanks made of EA4T steel. Rotating bending tests under constant amplitude loading as well as overload tests considering overload ratios of R OL = 2.0 and R OL = 2.5 are conducted. The experimental results are compared to a crack growth assessment based on a modified NASGRO equation as well as the retardation model by Willenborg, Gallagher, and Hughes. The evaluated delay cycle number due to the overload by the experiments and the model shows a sound agreement validating the applicability of the presented approach.

AB - This work investigates overload-induced retardation effects for semi-elliptically cracked steel round bars. The specimen geometry equals the shaft area of a 1:3 down-scaled railway axle and the material is extracted from railway axle blanks made of EA4T steel. Rotating bending tests under constant amplitude loading as well as overload tests considering overload ratios of R OL = 2.0 and R OL = 2.5 are conducted. The experimental results are compared to a crack growth assessment based on a modified NASGRO equation as well as the retardation model by Willenborg, Gallagher, and Hughes. The evaluated delay cycle number due to the overload by the experiments and the model shows a sound agreement validating the applicability of the presented approach.

UR - http://www.scopus.com/inward/record.url?scp=85062335764&partnerID=8YFLogxK

U2 - 10.3390/met9020156

DO - 10.3390/met9020156

M3 - Article

VL - 9.2019

JO - Metals : open access journal

JF - Metals : open access journal

SN - 2075-4701

IS - 2

M1 - 156

ER -