The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Nov. 13, 2020
Waseda University, Tokyo, JP;
Kanagawa Institute of Industial Science and Technology, Ebina, JP;
JP Steel Plantech Co., Yokohama, JP;
Atsushi Hosoi, Tokyo, JP;
Hiroyuki Kawada, Tokyo, JP;
Kazuki Harada, Tokyo, JP;
Kristine Munk Jespersen, Kanagawa, JP;
WASEDA UNIVERSITY, Tokyo, JP;
KANAGAWA INSTITUTE OF INDUSTRIAL SCIENCE AND TECHNOLOGY, Ebina, JP;
JP STEEL PLANTECH CO., Yokohama, JP;
Abstract
A fracture toughness testing machine evaluates fracture toughness of a specimen in pure mode. The testing machine includes: a testing-load applying device for applying a predetermined testing load to the specimen, in which the stresses are present; and a cancelling-load applying device for applying a cancelling load to the specimen to cancel the stresses therein. The cancelling-load applying device includes: a pressing-force applying portion that applies a pressing force to the specimen as the canceling load; and a pressing-force determining portion that determines magnitude of the force. The pressing-force determining portion calculates the magnitude of the force using pre-stored equations so that an energy release rate related to in-plane shear mode crack deformation becomes zero.