Epoxy glass fiber laminate composite (PMCs) are finding ever increasing applications in aerospace and automobile industries due to its high strength to weight ratio and resistance to aqueous environment. Additions of ...Epoxy glass fiber laminate composite (PMCs) are finding ever increasing applications in aerospace and automobile industries due to its high strength to weight ratio and resistance to aqueous environment. Additions of particulate reinforcements in the polymer matrix are reported to improve the Interlaminar Shear Strength and Interlaminar Fracture Toughness of the composites. In the present investigation, epoxy glass fiber laminate composites were processed using hand layup and vacuum bagging technique. The particulate reinforcement precipitator fly ash (25 - 45 μm) was added in the epoxy matrix by mechanical mixing up to 10 wt%. The effects of fly ash reinforcement on the mechanical properties and Interlaminar Fracture Toughness were studied before and after exposure to aqueous fog in a salt fog chamber at 45°C. In unexposed condition Mode I interlaminar fracture toughness of epoxy glass fiber laminate composite improved by the addition of fly ash reinforcement 10% (By weight) by 49.43% and when it was subjected to aqueous fog for 10 days the interlaminar fracture toughness improved 58.42%. Exposure to aqueous fog for 10 days causes plasticization of resin matrix and weakening of fiber/matrix interface results in improvement in interlaminar fracture toughness. The fracture surfaces were analyzed using scanning electron microscopy.展开更多
以环氧树脂(EP)为基体,单层玻璃纤维(GF)布为增强体,利用真空辅助树脂传递模塑工艺制备了具有[0°]_(_(6s)),[45°/–45°]_(_(3s)),[0°/90°]_(_(3s)),[90°]_(_(6s))铺层结构的EP/GF复合材料层合板,通过拉...以环氧树脂(EP)为基体,单层玻璃纤维(GF)布为增强体,利用真空辅助树脂传递模塑工艺制备了具有[0°]_(_(6s)),[45°/–45°]_(_(3s)),[0°/90°]_(_(3s)),[90°]_(_(6s))铺层结构的EP/GF复合材料层合板,通过拉伸失效实验研究了铺层结构对复合材料层合板沉头螺栓连接承载能力的影响,并进一步分析了4种铺层结构的沉头螺栓连接层合板在拉伸时的失效行为。结果表明,[45°/–45°]_(_(3s))与[0°/90°]_(_(3s))铺层结构的层合板均发生了承载失效,具有较高的螺栓连接承载能力,其中[0°/90°]_(3s)铺层结构的层合板最大拉伸载荷最高,为6.7 k N,[45°/–45°]_(3s)铺层结构的层合板具有最大的失效位移,为14.17 mm;[0°]_(6s)铺层结构的层合板发生了剪切开裂失效,其螺栓连接承载能力低于上述两种铺层结构;[90°]_(6s)铺层结构的层合板发生了净张力失效,其螺栓连接承载能力最低。展开更多
文摘Epoxy glass fiber laminate composite (PMCs) are finding ever increasing applications in aerospace and automobile industries due to its high strength to weight ratio and resistance to aqueous environment. Additions of particulate reinforcements in the polymer matrix are reported to improve the Interlaminar Shear Strength and Interlaminar Fracture Toughness of the composites. In the present investigation, epoxy glass fiber laminate composites were processed using hand layup and vacuum bagging technique. The particulate reinforcement precipitator fly ash (25 - 45 μm) was added in the epoxy matrix by mechanical mixing up to 10 wt%. The effects of fly ash reinforcement on the mechanical properties and Interlaminar Fracture Toughness were studied before and after exposure to aqueous fog in a salt fog chamber at 45°C. In unexposed condition Mode I interlaminar fracture toughness of epoxy glass fiber laminate composite improved by the addition of fly ash reinforcement 10% (By weight) by 49.43% and when it was subjected to aqueous fog for 10 days the interlaminar fracture toughness improved 58.42%. Exposure to aqueous fog for 10 days causes plasticization of resin matrix and weakening of fiber/matrix interface results in improvement in interlaminar fracture toughness. The fracture surfaces were analyzed using scanning electron microscopy.
文摘以环氧树脂(EP)为基体,单层玻璃纤维(GF)布为增强体,利用真空辅助树脂传递模塑工艺制备了具有[0°]_(_(6s)),[45°/–45°]_(_(3s)),[0°/90°]_(_(3s)),[90°]_(_(6s))铺层结构的EP/GF复合材料层合板,通过拉伸失效实验研究了铺层结构对复合材料层合板沉头螺栓连接承载能力的影响,并进一步分析了4种铺层结构的沉头螺栓连接层合板在拉伸时的失效行为。结果表明,[45°/–45°]_(_(3s))与[0°/90°]_(_(3s))铺层结构的层合板均发生了承载失效,具有较高的螺栓连接承载能力,其中[0°/90°]_(3s)铺层结构的层合板最大拉伸载荷最高,为6.7 k N,[45°/–45°]_(3s)铺层结构的层合板具有最大的失效位移,为14.17 mm;[0°]_(6s)铺层结构的层合板发生了剪切开裂失效,其螺栓连接承载能力低于上述两种铺层结构;[90°]_(6s)铺层结构的层合板发生了净张力失效,其螺栓连接承载能力最低。
