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. 15, 2014
Filed:
Feb. 28, 2011
Hisamitu Hatou, Hitachi, JP;
Noboru Saitou, Kasumigaura, JP;
Kouichi Kurosawa, Hitachi, JP;
Fujio Yoshikubo, Mito, JP;
Yuji Matsui, Hitachinaka, JP;
Masashi Fukaya, Kashiwa, JP;
Hisamitu Hatou, Hitachi, JP;
Noboru Saitou, Kasumigaura, JP;
Kouichi Kurosawa, Hitachi, JP;
Fujio Yoshikubo, Mito, JP;
Yuji Matsui, Hitachinaka, JP;
Masashi Fukaya, Kashiwa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An evaluation method of residual stress in water jet peening includes a step of creating an analytical model including meshes according to a water jet peening (WJP) object, the shape of a nozzle, and an injection distance, a step of inputting WJP execution conditions, a step of calculating the internal pressure pof a cavitation bubble and a bubble number density nthrough jet flow analysis for a jet flow jetting from the nozzle, a step of calculating cavitation energy according to the internal pressure pof a cavitation bubble and a bubble number density n(S), a step of calculating the burst energy of cavitation bubbles from the cavitation energy C, and a step of calculating the compressive residual stress of the WJP object from the collapse pressure of cavitation bubbles. Accordingly, the residual stress of the WJP object can be evaluated precisely in a shorter time.