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金允海(Yun-Hae Kim),金永植(Young-Sik Kim),西谷弘信(Hironobu Nisitani) 한국해양공학회 1993 韓國海洋工學會誌 Vol.7 No.2
The static tensile tests of GFRP, ID300, CFRID300 and CFRPEEK were made on the plain and notched specimens at room temperature. The results were discussed based on linear notch mechanics which was proposed by H.Nisitani.<br/> The fracture of notched GFRP, ID300, CFRID300 and CFRPEEK specimens is controlled by the elastic maximum stress, σmax, and the notch root radius, p, alone, independently of the other geometrical conditions. The relation between fracture nominal stress, σc and stress concentration factor, Kt, is to be classified into two parts, namely, a part where σc decreases with increasing Kt and a part where σc is nearly constant independent of Kt. A similar phenomenon can be seen in the fatigue tests of notched specimens under rotating bending or push-pull.<br/> The almost constant σc values correspond to the nearly constant apparent stress intensity factor, Klpc values, obtained by assuming p=0. This can be attributed to the existence of the stable crack. Linear notch mechanics is very useful for analyzing the static tensile fracture behavior of notched GFRP, ID300, CFRID300, and CFRPEEK specimens.
Development of Heating Table Fabrication Process for the High Speed Curing Composites
Kim, Yun-Hae,Ha, Jin-Cheol,Lee, Jin-Woo,Park, Jun-Mu,Han, Joong-Won,Choi, Byung-Keun,Moon, Kyung-Man,Nisitani, Hironobu Korean Society of Ocean Engineers 2013 International journal of ocean system engineering Vol.3 No.1
Wind turbine generator is, recently, becoming bigger and bigger. So, in order to produce large amounts of electricity generation, we have to consider the length and thickness of the blade. We investigated the skills of processing for making the super thickness laminate through development fabrication process for high speed curing composite heating table.