title: Sapphire screws and strength test on them at liquid nitrogen temperature.
abstract: We fabricated several sapphire screw threads and performed a strength test on them at the liquid nitrogen temperature of 77 K. The screw threads were subjected to and withstood a 3000 N load. To the best of our knowledge, this is the first strength test of sapphire screw threads at a cryogenic temperature. The result suggests a new way of connecting sapphire components. Although sapphire is already used in many applications, the result may provide a new way to use the material as a structural element in even more applications.
authors.affiliation: Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8582, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Hirose
authors.affiliation: Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8582, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Sakakibara
authors.affiliation: Shinkosha Co., Ltd., 2-4-1 Kosugaya, Sakae-ku, Yokohama, Kanagawa 247-0007, Japan.
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Igarashi
authors.affiliation: Shinkosha Co., Ltd., 2-4-1 Kosugaya, Sakae-ku, Yokohama, Kanagawa 247-0007, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Ishii