현무암 강화 복합재료의 파괴 거동에 해수 흡수의 영향 연구

Abstract

In this study, mode I fracture tests were conducted using basalt fiber reinforced epoxy (BFRE) composites with and without seawater absorption in order to investigate the effect of the seawater absorption on the mode I fracture toughness (GIc) of the BFRE composites. Following the fracture tests, scanning electron microscopy (SEM) was used to examine the mechanisms of fracturing as a result of seawater absorption. The result demonstrated that the compliance of the seawater-absorbed specimen was larger than that of the dry specimen at the same crack length, while the opposite result was obtained for the fracture load. The GIc value of the seawater-absorbed BFRE composites was approximately 20% lower than that of the dry BFRE composites. SEM examination of the fracture surfaces revealed that the decrease in fracture toughness of the seawater-absorbed specimens were due to the weakening of interfacial bonding from swelling of the epoxy matrix.Ic) of the BFRE composites. Following the fracture tests, scanning electron microscopy (SEM) was used to examine the mechanisms of fracturing as a result of seawater absorption. The result demonstrated that the compliance of the seawater-absorbed specimen was larger than that of the dry specimen at the same crack length, while the opposite result was obtained for the fracture load. The GIc value of the seawater-absorbed BFRE composites was approximately 20% lower than that of the dry BFRE composites. SEM examination of the fracture surfaces revealed that the decrease in fracture toughness of the seawater-absorbed specimens were due to the weakening of interfacial bonding from swelling of the epoxy matrix.