著者

本間 正葵 加藤 保之 上田 政人

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集 : JSME annual meeting

巻号頁・発行日

vol.2009, no.1, pp.53-54, 2009-09-12

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A research program for investigating the thermo-elasto-plastic behavior when a laser beam is irradiated to the surface of a thin metal plate with cooling its backside is described in this paper. The residual deformation and the residual internal force occur in a thin plate after the cooling process. Therefore the plastic analyses for the second and third irradiation are more complicated. Based on the radial flow rule, the deformation increments can be decomposed into an elastic component and plasticity component on the interaction curve. In this paper, the plastic analysis for the third irradiation, which is obtained after the first and the second irradiation were performed, is treated. Especially, the distributions of the residual internal forces obtained after cooling process for the third irradiation are revealed.

著者

上田 政人 高嶋 豊士 加藤 保之 西村 哲

出版者

日本複合材料学会

雑誌

日本複合材料学会誌 (ISSN:03852563)

巻号頁・発行日

vol.36, no.3, pp.104-111, 2010 (Released:2011-03-05)

参考文献数

31

被引用文献数

1 1

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Progressive crushing tests of unidirectionally laminated carbon fiber reinforced plastic (CFRP) rectangular plate were carried out to reveal its continuous fracture behavior and energy absorption. A special test fixture was developed for the test and fracture process of the CFRP was observed from its side section. Three types of trigger geometries, i.e. chamfer, steeple and V-shape trigger, were machined on each specimen. Film embedded V-shape trigger was also prepared to investigate the effect of initial cracks on energy absorption. The initial fracture behavior strongly affected the ensuing stable fracture process. It was clarified that V-shape trigger specimen was robust over the variation of gage length (unsupported length) as compared to chamfer and steeple trigger specimen which showed smaller energy absorption with longer gage length. A column-like part, which was called pillar in this paper, was observed between fronds under crushing. The fracture was much severe at pillar section than fronds section. Fiber fractures were observed periodically at 50-100 μm length in the pillar section, which coincides with the length of kink band in ultimate compressive failures of CFRP. It was revealed that the thickness of pillar was dominant factor on energy absorption of unidirectional CFRP.