著者

松岡 武史 佐々木 大輔 藤岡 潤 泉野 浩嗣 加藤 亨

出版者

公益社団法人 日本工学教育協会

雑誌

工学教育 (ISSN:13412167)

巻号頁・発行日

vol.66, no.4, pp.4_45-4_51, 2018 (Released:2018-07-27)

参考文献数

19

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Recently, the industrial accidents rate of young unskilled workers is increasing in our country. Therefore, in national institute of technology which produces young engineers, an effective safety and health education for these workers is also desired strongly. Action to collect near-miss incident information is important position in such education. However, the near-miss reporting is not functioning effectively at the majority of national institute of technology because of negative consciousness and lack of understandings about this activity. In this research, we proposed the teaching method about the near-miss reporting using minority influence in order to solve these issues and carried out this method for three years from 2015 at our school. In this paper, we showed that injury accidents and tool breakages decrease as student near-miss reports increase, and safety culture maturity level in the mechanical workshop rises.

著者

渡壁 智祥 山本 智彦 深沢 剛司 岡村 茂樹 杣木 孝裕 諸菱 亮太 櫻井 祐 加藤 亨二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00444-16-00444, 2017 (Released:2017-06-25)

参考文献数

9

被引用文献数

1

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A seismic isolation system composed of a thick rubber bearing and an oil damper has been developed for Sodium-Cooled Fast Reactor. One of the advantages of the isolation system is the use of thick rubber bearings to ensure the longer vertical natural period of a plant, thereby mitigating seismic loads to mechanical components. Characteristics of thick rubber bearings have been confirmed through a series of tests. This paper focused on the aging properties of thick rubber bearings, such as basic mechanical properties and ultimate strength. An aging test of thick rubber bearings was conducted using 1/2-scale (800 mm diameter) and 1/8-scale (200 mm diameter) rubber bearings. Aging of the rubber bearings was reproduced using thermal degradation based on Arrhenius law, in which the target of aging periods was 60 years, plant life time. The hysteresis loops of the thick rubber bearings after aging were obtained through horizontal and vertical static loading tests, and the effects of aging were evaluated by comparison with the initial mechanical properties. In addition, for the purpose of further research, the effect of scale by aging was clarified to compare the mechanical properties between the 1/2-scale and 1/8-scale rubber bearings.