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Development of New Design Fatigue Curves in Japan: Proposal of a New Fatigue Evaluation Method

[+] Author Affiliations
Seiji Asada

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Akihiko Hirano

Hitachi-GE Nuclear Energy, Ltd., Hitachi, Japan

Toshiyuki Saito

Toshiba Energy Systems & Solutions Co., Yokohama, Japan

Yasukazu Takada

Kansai Electric Power Co., Inc., Osaka, Japan

Hideo Kobayashi

Tokyo Institute of Technology, Tokyo, Japan

Paper No. PVP2018-84432, pp. V03BT03A004; 9 pages
doi:10.1115/PVP2018-84432
From:
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 3B: Design and Analysis
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5163-0
  • Copyright © 2018 by ASME

abstract

In order to develop new design fatigue curves for carbon steels & low-alloy steels and austenitic stainless steels and a new design fatigue evaluation method that are rational and have clear design basis, Design Fatigue Curve (DFC) Phase 1 subcommittee and Phase 2 subcommittee were established in the Atomic Energy Research Committee in the Japan Welding Engineering Society (JWES). The study on design fatigue curves was actively performed in the subcommittees.

In the subcommittees, domestic and foreign fatigue data of small test specimens in air were collected and a comprehensive fatigue database (≈6000 data) was constructed and the accurate best-fit curves of carbon steels & low-alloy steels and austenitic stainless steels were developed. Design factors were investigated. Also, a Japanese utility collaborative project performed large scale fatigue tests using austenitic stainless steel piping and low-alloy steel flat plates as well as fatigue tests using small specimens to obtain not only basic data but also fatigue data of mean stress effect, surface finish effect and size effect. Those test results were provided to the subcommittee and utilized the above studies.

Based on the above studies, a new fatigue evaluation method has been developed.

Copyright © 2018 by ASME

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