Dynamic fracture toughness of tungsten under ternary loading

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820397
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: Osaka University
• Principal Investigator: Lee Heun Tae 大阪大学, 工学研究科, 助教 (90643297)
• Research Collaborator: UEDA Yoshio 大阪大学, 工学研究科, 教授 (30193816) ; KATSUMA Hiroyuki 大阪大学, 工学研究科 ; YAKUSHIJI Kouki 大阪大学, 工学研究科 ; UEDA Kazuki 大阪大学, 工学研究科 ; ANDO Sousuke 大阪大学, 工学研究科, 学部学生 ; KASADA Ryuta 京都大学, エネルギー理工学研究所, 准教授 (20335227) ; Thomas Schwarz-Selinger Max Planck Institute for Plasmaphysics, 研究員
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: タングステン / レーザー超音波法 / 機械的性質 / 水素同位体 / ヘリウム / 照射損傷

Outline of Final Research Achievements

Magnetic nuclear fusion reaction occurs in a plasma confined inside a vacuum vessel with a wall composed of plasma facing material. Tungsten is an important facing material. Tungsten is a brittle material, but in a fusion reactor it is exposed to hydrogen, helium, and neutron particles. These three types of particles are known to increase the brittleness of metals such as tungsten.
In this study, the effect of hydrogen, helium, and neutrons on the mechanical behavior of tungsten was clarified. We also examined select cases of binary and ternary loading. The mechanical properties of tungsten were evaluated by applying a new experimental method called laser ultrasonic method. We also evaluated the mechanical properties of advanced materials to overcome brittle fracture of tungsten.

Free Research Field

核融合学プラズマ・壁相互作用