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Journal Articles

Saturation behavior of thermal ratcheting strain due to long range travel of temperature distribution

Okajima, Satoshi; Wakai, Takashi

Nippon Kikai Gakkai 2017-Nendo Nenji Taikai Koen Rombunshu (DVD-ROM), 5 Pages, 2017/09

It was reported that the long distance travel of temperature distribution causes a new type of thermal ratcheting, even in the absence of primary stress. In this paper, based on the results of inelastic finite element analyses, we investigated saturation behavior of thermal ratcheting strain due to long range travel of temperature distribution. As a result, we revealed that the long distance travel of temperature distribution generates plastic strain distribution made maximum at the central part. Because of the shape of the generated strain distribution, the residual stress accumulates even at the central part of the region passed through the temperature distribution. In the case with excessive long traveling of temperature distribution, the region with plastic deformation extended to the surrounding region. Otherwise, sufficient magnitude of residual stress to cause shakedown behavior accumulated on entire region, and the accumulation of the plastic strain saturated.

Journal Articles

Front-loading for metal powder additive manufacturing processes with a computational science simulation code SPLICE

Muramatsu, Toshiharu; Aoyagi, Yuji*; Yoshiuji, Takahiro*

Nippon Kikai Gakkai 2017-Nendo Nenji Taikai Koen Rombunshu (DVD-ROM), 4 Pages, 2017/09

A general-purpose three-dimensional thermohydraulics numerical simulation code SPLICE was developed at Japan Atomic Energy Agency and designed to deal with gas-liquid-solid consolidated incompressible viscous flows with a phase change process in various laser applications, such as welding, coating, cutting, etc. The result obtained from metal powder laser additive manufacturing simulations is very encouraging in the sense that the SPLICE code would be used as one of efficient tools to provide the laser irradiation conditions.

Journal Articles

Introduction and development of reliability evaluation in the field of mechanical engineering; Introduction of partial safety factor method into metal loss assessment for pressure equipment

Okajima, Satoshi

Nippon Kikai Gakkai 2017-Nendo Nenji Taikai Koen Rombunshu (DVD-ROM), 3 Pages, 2017/09

Fitness-For-Service (FFS) assessment for the component with metal-loss is desired to reflect the effect of usual maintenance. Introduction of evaluation method based on reliability is one of the effective measures to achieve this. High Pressure Institute of Japan published HPIS Z 109TR:2016 "Metal loss assessment for pressure equipment based on reliability", which provides methods and technical backgrounds of metal loss assessment for pressure equipment based on reliability. This technical report provides evaluation method for simply evaluating reliability of the pressure equipment with metal loss based on the partial safety factor method. We present outline of the evaluation method based on the partial safety factor method.

Oral presentation

Development of hydrogen behavior simulation system for safety management

Terada, Atsuhiko

no journal, , 

To further improve the safety performance of the Nuclear Power Station, especially on the hydrogen safety under severe accident conditions, a simulation code system has been developed to analyze hydrogen behaviors including diffusion, combustion, explosion and structural integrity evaluation. As one of validation test of a numerical simulation system for leaked hydrogen gas behavior, we compared calculated results by some calculation methods and time histories of hydrogen gas concentration at seven sensor positions of leaking hydrogen gas in closed container installed the new type passive autocatalytic recombiner. The calculated results show good agreement with experimental results. Depending on the calculation method, some effect is shown.

Oral presentation

Water experiments on thermal striping around upper internal structure in an advanced sodium cooled fast reactor

Kobayashi, Jun; Ezure, Toshiki; Tanaka, Masaaki; Kamide, Hideki

no journal, , 

Hot sodium from a fuel subassembly can mix with cold sodium from a control rod (CR) channel at a bottom of Upper Internal Structure in Advanced-SFR reactor vessel. It was confirmed by the water experiment that a mitigation countermeasure was applied to the temperature fluctuation intensity, and effective.

Oral presentation

The JSME Standard on the reliability evaluation of mechanical structures and related trends

Asayama, Tai

no journal, , 

In response to the increasing demands for the reliability assessment of mechanical structures, a new standard is being issued from the Japan Society of Mechanical Engineers that provides procedures applicable to mechanical products in general utilizing the Load and Resistance Factor Design (LRFD) method. This paper describes the background and technical features of the standard as well as some of the activities on developing related codes and standards.

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