PSI - Issue 19

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 19 (2019) 320–327

Fatigue Design 2019 Micro-scale frictional behavior of a bearing steel (JIS SUJ2) in cyclic sliding motion Yuya Tanaka a, *, Hisao Matsunaga b,c,d , Masahiro Endo d,e , Shigeaki Moriyama d,e a Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan b Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan c International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan d Institute of Materials Science and Technology, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan e Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan Application of fracture mechanics has recently been emphasized to establish the mechanics-based evaluation of the rolling contact fatigue strength for designing mechanical elements such as bearing, rail/wheel, gear, etc. Flaking that is a typical rolling contact failure mode is intimately related to the shear-mode (modes II and III) fatigue crack growth, which is significantly affected by the interaction of opposing crack faces. Understanding the tribological properties on the crack faces being in the reciprocating sliding contact is therefore essential for the material design as well as the mechanical design of many components associated with rolling contact fatigue. The present study carried out a ring-on-ring test by making use of a combined axial torsional fatigue testing machine to investigate the micro-scale frictional phenomena under the non-lubricated condition. The material investigated was a heat-treated high-carbon-chromium bearing steel (JIS SUJ2) with a Vickers hardness of 753. The tests were conducted up to 10 4 cycles under the various conditions of mean contact pressures of 10-100 MPa, relative displacement amplitudes of about 10- 100 μm, sinusoidal frequencies of 0.1-10Hz, and initial surface roughness values, R a , of 0.2 1.7. The time variations of the tangential force, contact load and the relative displacement between contact surfaces were periodically monitored at a predetermined number of cycles during testing. Fatigue Design 2019 Micro-scale frictional behavior of a bearing steel (JIS SUJ2) in cyclic sliding motion Yuya Tanaka a, *, Hisao Matsunaga b,c,d , Masahiro Endo d,e , Shigeaki Moriyama d,e a G aduate School of Engi eering, Kyush University, 744 Moto ka, Nishi-ku, F kuo a 819-0395, Japan b Department of Mechanic gineering, Kyushu Universit , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan c Internatio al Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 M tooka, Nishi-ku, Fukuoka 819-0395, Japan d Institute of Materials Scien e and Technology, Fu uoka University, 8 9-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan e Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan Abstract Application of fracture mechanics has rece tly been emphasized to establish the mechanics-based evaluation of the r lli t t fatigu strength for designing mechanical elements such as b aring, rail/wheel, g ar, etc. Flaking that is a typical rolling contact failure mode is i timately related to the shear-mode (modes II and III) fatigue crack growth, which is sig ificantly affected by the interaction of opposing crack f ces. Understanding the tribological prop rties on the crack faces being i the reciprocating sliding contact is therefore essential for the material design as well as the mechanical design f many components associated with rolling contact fatigue. The present study carried out a ring-on-ring test by making use of a combined axial torsional fatigue testing machine to investigate the micr -scale frictional phenomena under the non-lubricated condition. The material investigated was a heat-treated high-carbon-chromium bearing steel (JIS SUJ2) with a Vickers hardness of 753. The tests were conducted up to 10 4 cycles under the various conditions of mean contact pressures of 10-100 MPa, relative displacement amplitudes of about 10- 100 μm, sinusoidal frequencies of 0.1-10Hz, and initial surface roughness values, R a , of 0.2 1.7. The time variations of th tangential force, contact load and the relative displacement between contact surfaces were periodically monitored at a predetermined number of cycles during testing. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

Keywords: Rorring contact fatigue ; Shear-mode fatigue crack ; Crack face interaction ; Bearing steel ; Coefficient of kinetic friction Keywords: Rorring contact fatigue ; Shear-mode fatigue crack ; Crack face interaction ; Bearing steel ; Coefficient of kinetic friction

* Corresponding author. Tel.: +81-92-802-3902. E-mail address: tanaka.yuya.785@s.kyushu-u.ac.jp * Correspon ing author. Tel.: +81-92-802-3902. E-mail address: tanaka.yuya.785@s.kyushu-u.ac.jp

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.035