In this study, fracture toughness of carbon –glass fiber reinforced epoxy interply hybrid composite was investigated. The purposed of this work was to design a carbon-glass/epoxy interply hybrid composite material that is low cost in production, lightweight, and has good strength and stiffness. In d...
In this study, fracture toughness of carbon –glass fiber reinforced epoxy interply hybrid composite was investigated. The purposed of this work was to design a carbon-glass/epoxy interply hybrid composite material that is low cost in production, lightweight, and has good strength and stiffness. In design of laminate composites, as a brittle structure, fracture toughness is a major of a crucial phenomenon. Because of, it will be a sudden failure the structural components without warning. Fracture toughness is usually used as a generic term for measures of material resistance to extension of a crack. In addition, the fracture toughness value may also serve as a basis in material characterization, performance evaluation, and quality assurance for typical engineering production. Therefore, fracture toughness testing and evaluation has been a very important issue in development of fracture mechanism methods and its engineering application. In this experiment, the interply hybrid composites had manufactured using a vacuum-assisted resin transfer molding (VARTM) process. This manner is a liquid composite molding technique to manufacture a large composite structure. Additionally, VARTM process provide considerable flexibility, because the woven fibers used in this technology are easier to handle and considerably cheaper than preprags. In present work, we laminate 70 layers for each panel. In this case, two types of panels were produced. Firstly, panel with carbon-glass/epoxy interply hybrid composite according to an enhancement number layers of glass (i.e., 10% to 40%) into the carbon fiber reinforced polymer (CFRP). Secondly, panel with different arrangement between of glass fiber and the carbon fiber (GCG, CGCGC). Therefore, the panel we cut as compact tension (CT) specimen type use water-jet machine. In the test, five CT specimen was examined under the tensile test. The laminates are assumed anisotropic but homogeneous in the two dimensional approach discussed. The stress intensity factor is considered to be the average value through the thickness, and effect of enhancement of glass layer and arrangement of layer between the glass and carbon is taken into the account. The fracture toughness, KIc, is calculated using the compliance method the fracture toughness was determined as the function of specimen geometry, loading and creak extension accordance to standard ASTM D 5045. In this study, according to the enhancement of glass layer into the CFRP, the fracture toughness KIc of interply hybrid composites is decreases with increasing the number of glass fiber. The interply (CGC 10%) was decreased of 7% against the CFRP. Additionally, increasing number of glass fiber (i.e., 10% to 40%) into the CFRP had decreased the fracture toughness of 10%, 4.6% and 2.5% for each addition of glass layer, respectively. Afterwards, for an interply hybrid composite, according to the arrangement of glass fiber and carbon fiber has shown an increased value of fracture toughness. In this case, the interply hybrid composite (CGCGC) shown the highest fracture toughness value than CGC and GCG about 34.5MPa.m½. This result shows that the arrangment of fiber significantly influence the fracture toughness of composites material. In this case via the scanning electron microscope (SEM) analysis shows the specimen failed in brittle manner for both fibers. However, glass fibers were showed failed in rupture manner compared with carbon fiber. This result shows that the arrangement of fiber significantly influence the fracture toughness of composites material. In this case via the scanning electron microscope (SEM) analysis shows the specimen failed in brittle manner for both fibers. However, glass fibers were showed failed in rupture manner compared with carbon fiber.
In this study, fracture toughness of carbon –glass fiber reinforced epoxy interply hybrid composite was investigated. The purposed of this work was to design a carbon-glass/epoxy interply hybrid composite material that is low cost in production, lightweight, and has good strength and stiffness. In design of laminate composites, as a brittle structure, fracture toughness is a major of a crucial phenomenon. Because of, it will be a sudden failure the structural components without warning. Fracture toughness is usually used as a generic term for measures of material resistance to extension of a crack. In addition, the fracture toughness value may also serve as a basis in material characterization, performance evaluation, and quality assurance for typical engineering production. Therefore, fracture toughness testing and evaluation has been a very important issue in development of fracture mechanism methods and its engineering application. In this experiment, the interply hybrid composites had manufactured using a vacuum-assisted resin transfer molding (VARTM) process. This manner is a liquid composite molding technique to manufacture a large composite structure. Additionally, VARTM process provide considerable flexibility, because the woven fibers used in this technology are easier to handle and considerably cheaper than preprags. In present work, we laminate 70 layers for each panel. In this case, two types of panels were produced. Firstly, panel with carbon-glass/epoxy interply hybrid composite according to an enhancement number layers of glass (i.e., 10% to 40%) into the carbon fiber reinforced polymer (CFRP). Secondly, panel with different arrangement between of glass fiber and the carbon fiber (GCG, CGCGC). Therefore, the panel we cut as compact tension (CT) specimen type use water-jet machine. In the test, five CT specimen was examined under the tensile test. The laminates are assumed anisotropic but homogeneous in the two dimensional approach discussed. The stress intensity factor is considered to be the average value through the thickness, and effect of enhancement of glass layer and arrangement of layer between the glass and carbon is taken into the account. The fracture toughness, KIc, is calculated using the compliance method the fracture toughness was determined as the function of specimen geometry, loading and creak extension accordance to standard ASTM D 5045. In this study, according to the enhancement of glass layer into the CFRP, the fracture toughness KIc of interply hybrid composites is decreases with increasing the number of glass fiber. The interply (CGC 10%) was decreased of 7% against the CFRP. Additionally, increasing number of glass fiber (i.e., 10% to 40%) into the CFRP had decreased the fracture toughness of 10%, 4.6% and 2.5% for each addition of glass layer, respectively. Afterwards, for an interply hybrid composite, according to the arrangement of glass fiber and carbon fiber has shown an increased value of fracture toughness. In this case, the interply hybrid composite (CGCGC) shown the highest fracture toughness value than CGC and GCG about 34.5MPa.m½. This result shows that the arrangment of fiber significantly influence the fracture toughness of composites material. In this case via the scanning electron microscope (SEM) analysis shows the specimen failed in brittle manner for both fibers. However, glass fibers were showed failed in rupture manner compared with carbon fiber. This result shows that the arrangement of fiber significantly influence the fracture toughness of composites material. In this case via the scanning electron microscope (SEM) analysis shows the specimen failed in brittle manner for both fibers. However, glass fibers were showed failed in rupture manner compared with carbon fiber.
주제어
#Hybrid Composite, glass fiber, fracture toughness, Carbon Fiber
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