PSI - Issue 19

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

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ScienceDirect

Procedia Structural Integrity 19 (2019) 168–174

Fatigue Design 2019 Correlation between rotating bending fatigue limit and static strength of Mg-Al-Zn alloys Kiyotaka MASAKI* National Institute of Technology, Okinawa College, Nago, Okinawa 905-2192, Japan Fatigue Design 2019 Correlation between rotating bending fatigue limit and static strength of Mg-Al-Zn alloys Kiyotaka MASAKI* National Institute of Technology, Okinawa College, Nago, Okinawa 905-2192, Japan In order to investigate the correlation between fatigue limit and static strength of extruded Mg-Al-Z alloys, rotat ng bendi g fatigue tests with ree types of Mg-Al-Zn alloy, AZ31, AZ61 and AZ80, were c ried out. And static t nsile test and compression test with th lloy were also performed. On the other hand, in order to clarify the correlation between them, more than 200 past literatu researches n fatigue property of various Mg alloys were surveyed. As a result of past literature research, it was found that there was a proportional relationship between fatigue limit and static strength. The fatigu limit and th static trength obt ined by the experiment of this study agree well with the proportional relation obt ined as a result of the literature survey. In particular, considering t super long lif fatigue ange up to 10 8 cycles or more, the fatigue limit of AZ 31 and AZ 61 was found o be almost equal to their compressive 0.2% proof stress. However, it was found that the fatigu limit of AZ80 is ower than the compressive 0.2% pr of stress, and when it is considered that the compressive 0.2% proof stress and the fatigue limit are equal, it becomes a prediction of the dangerous side. Abstract Abstract In order to investigate the correlation between fatigue limit and static strength of extruded Mg-Al-Zn alloys, rotating bending fatigue tests with three types of Mg-Al-Zn alloy, AZ31, AZ61 and AZ80, were carried out. And static tensile test and compression test with these alloys were also performed. On the other hand, in order to clarify the correlation between them, more than 200 past literature researches on fatigue property of various Mg alloys were surveyed. As a result of past literature research, it was found that there was a proportional relationship between fatigue limit and static strength. The fatigue limit and the static strength obtained by the experiment of this study agree well with the proportional relation obtained as a result of the literature survey. In particular, considering the super long life fatigue range up to 10 8 cycles or more, the fatigue limit of AZ 31 and AZ 61 was found to be almost equal to their compressive 0.2% proof stress. However, it was found that the fatigue limit of AZ80 is lower than the compressive 0.2% proof stress, and when it is considered that the compressive 0.2% proof stress and the fatigue limit are equal, it becomes a prediction of the dangerous side.

© 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. Publ shed by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

Keywords: Mg-Al-Zn alloys; Rotating bending fatigue limit; Static strength; Fatigue limit estimation; Keywords: Mg-Al-Zn alloys; Rotating bending fatigue limit; Static strength; Fatigue limit estimation;

1. Introduction 1. Introduction

Magnesium (Mg) alloys are being used for the purpose of reducing the weight of various devices such as mobile devices and transport devices. Since it is necessary to understand the fatigue property for application to mechanical Magnesium (Mg) alloys are being used for the purpose of reducing the weight of various devices such as mobile devices and transport devices. Since it is necessary to understand the fatigue property for application to mechanical

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. * Correspon ing author. Tel.: +81-980 55-4138; fax: +81-980-55-4138. E-mail address: masaki-k@okinawa-ct.ac.jp * Corresponding author. Tel.: +81-980-55-4138; fax: +81-980-55-4138. E-mail address: masaki-k@okinawa-ct.ac.jp

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.019