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김재훈(Kim J H),김후식(Kim H S),박병준(Park B J),조정미(Cho J M),주정수(Joo J S) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
It is well known that composite laminates are easily damaged by low velocity impact. Low velocity impact damage characteristics and residual compressive strength of composite laminates used in light rail transit are investigated. The damage of composite laminates subjected to impact loading are occurred matrix cracking, delamination, and fiber breakage. The damage of matrix cracking and delamination are reduced suddenly the compressive strength after impact. The objectives of this study is to evaluate impact characteristics and the relationship between impact force and inside damage of composite laminates by low velocity impact loading. UT C-scan is used to determine impact damage areas by impact loading.
김상범,이영범,최성희,최건형,권영수,조세현,조정미 한국공업화학회 2002 응용화학 Vol.6 No.1
In order to apply the fiber reinforced plastic(FRP) to support panel of polyurethane foam in LNG storage tank, we estimated the mechanical properties, degree of vapour barrier, chemical stability and thermal conductivity changes as ageing. According to the results, the mechanical strength (compressive strength, bending strength, tensile strength and shear strength) are more than 30 times higher than mechanical properties of plywood. The FRP-polyurethane foam(PUF) composites have lower thermal conductivity changes as ageing than plywood-PUF composites. FRP-PUF sandwich composite for LNG storage tank with these remarkable properties, are compared the abilities of these structures with those of the conventional structures (plywood-PUF sandwich composite), so we can obtain the effects such as superior mechanical properties and fuel saving through improved ability of vapor barrier.