Hitachi, Ltd.

Hitachi-Ge Nuclear Energy, Ltd.

Nitto Kohki Kabushiki Kaisha

Noboru Saitou

Hisamitu Hatou

Toshio Mikiya

Yuji Matsui

Shinji Matsushita

Masashi Fukaya

Ren Morinaka

Takashi Chiba

Kouichi Kurosawa

Hyakka Nakada

Kuniaki Shibuya

Fujio Yoshikubo

Hirotsugu Kawanaka

Tomohiko Motoki

Tadashi Iijima

Yuichi Koide

Jun Kashiwakura

A search apparatus includes a processor and a memory. The processor receives a molding result of a reference sample manufactured by the additive manufacturing apparatus. The processor calculates predicted values from a predictive model. The processor determines whether the evaluation target values are achieved by the measured values. The reference sample has at least three smooth surfaces and a surface having aggregated punched holes formed by straight lines and curved lines that are involved in three types of regions to be set as the conditions.

Additive manufacturing condition search apparatus, additive manufacturing condition search method, and reference sample

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.

Evaluation method of residual stress in water jet peening and method of executing water jet peening

A method for executing water jet peening for giving an impact force to a surface of a structure member by a crushing pressure of a water jet and cavitation and improving residual stress, or washing, or reforming said surface, wherein said water jet peening is executed so as to make a natural frequency of oscillation of said structure member and a excitation frequency of oscillation of water jet peening different from each other.

Method for executing water jet peening

Loop cutter

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Kasumigaura, Japan

Noboru Saitou