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황진호 ( Hwang Jin-ho ),정용은 ( Jeong Yong-eun ),정상국 ( Jung Sang Kug ),이송 ( Lee Song ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
Recently, environmental pollution is the one of most important issues. So many kinds of eco-sound construction materials have been a matter of concern. Prefabricated vertical drain made of natural fiber may be one of the solutions instead of Plastic Drain Board which can cause some environmental problems. In this study, consolidation test of PDB, FDB and SDB, were conducted by using the multiplex consolidation device which was designed for the purpose of direct comparison of drainage characteristics. From the test results, initial settlement behavior showed a tendency that the larger flow capacity Plastic Drain Board has, the faster initial settlement was. However, as consolidation process goes by, their time-settlement behaviors converged on some extents.
탄소섬유/에폭시 복합재료의 층간파괴인성에 미치는 균열진전각도의 영향
황진호,황운봉,Hwang, Jin-Ho,Hwang, Woon-Bong 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
Interlaminar fracture toughness of carbon/epoxy composite materials has been studied under tensile and flexural loading by the use of width tapered double cantilever beam(WTDCB) and end notched flexure(ENF) specimens. This study has significantly examined the effect of various interfacial ply orientation, ${\alpha}(0^{\circ},\;45^{\circ}\;and\;90^{\circ})$ and crack propagation direction, ${\theta}(0^{\circ},\;15^{\circ},\;30^{\circ}\;and\;45^{\circ})$ in terms of critical strain energy release rate through experiments. Twelve differently layered laminates were investigated. The data reduction for evaluating the fracture energy is based on compliance method and beam theory. Beam theory is used to analyze the effect of crack propagation direction. The geometry and lay-up sequence of specimens are considered various conditions such as skewness parameter, beam volume, and so on. The results show that the fiber bridging occurred due to the non-midplane crack propagation and causes the difference of fracture energy evaluated by both methods. For safer and more reliable composite structures, we obtain the optimal stacking sequence from initial fracture energy in each mode.