Fiber-reinforced silica ceramic matrix composites(SiO_(2) f/SiO_(2))have gained extensive attention in recent years for its applications in aeronautics field such as radar radome and window.However,the machining prope...Fiber-reinforced silica ceramic matrix composites(SiO_(2) f/SiO_(2))have gained extensive attention in recent years for its applications in aeronautics field such as radar radome and window.However,the machining properties and mechanism of the material remain unclear.The features and mechanical properties of the material itself have a significant influence on both its machining characteristics and surface integrity.Thus,a full-factor grinding experiment is conducted using a 3 D orthogonal SiO_(2) f/SiO_(2) aiming to obtain its machining characteristics.The effects of grinding parameters and tools on the grinding force,surface roughness,and material damage type are investigated using a dynamometer,Scanning Electron Microscope(SEM),and Acoustic Emission(AE)analysis.The AE frequency band is analyzed,and a semi-analytical force model is established to study the difference between a single grain and wheel grinding.It was found that the changes in surface roughness correlate with the changes in grinding force,with fiber fracture being the main reason behind the increase in grinding force.Finally,the material removal mechanism was studied based on the AE analysis.It was found that the removal mechanism is fiber fracture dominated with matrix crack and debonding,and the primary sources of energy consumption are fiber fracture and friction.展开更多
Ultra-high molecular weight polyethylene（UHMWPE） fiber/epoxy composites were fabricated by a vacuum assisted resin infused（VARI） processing technology. The curing condition of composites was at a cure temperature ...Ultra-high molecular weight polyethylene（UHMWPE） fiber/epoxy composites were fabricated by a vacuum assisted resin infused（VARI） processing technology. The curing condition of composites was at a cure temperature of 80 ℃ for 3h in a drying oven. The characteristics of 2.5D（shallow bend-joint and deep straight-joint） structure and 3D orthogonal structure were compared. The failure behavior, flexural strength, and microstructures of both composites were investigated. It was found that the flexural property was closely related to undulation angle θ. The flexural strength of 3D orthogonal structure composite was superior to the other two structures composites with the same weave parameters and resin.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51375333 and 51805365)。
文摘Fiber-reinforced silica ceramic matrix composites(SiO_(2) f/SiO_(2))have gained extensive attention in recent years for its applications in aeronautics field such as radar radome and window.However,the machining properties and mechanism of the material remain unclear.The features and mechanical properties of the material itself have a significant influence on both its machining characteristics and surface integrity.Thus,a full-factor grinding experiment is conducted using a 3 D orthogonal SiO_(2) f/SiO_(2) aiming to obtain its machining characteristics.The effects of grinding parameters and tools on the grinding force,surface roughness,and material damage type are investigated using a dynamometer,Scanning Electron Microscope(SEM),and Acoustic Emission(AE)analysis.The AE frequency band is analyzed,and a semi-analytical force model is established to study the difference between a single grain and wheel grinding.It was found that the changes in surface roughness correlate with the changes in grinding force,with fiber fracture being the main reason behind the increase in grinding force.Finally,the material removal mechanism was studied based on the AE analysis.It was found that the removal mechanism is fiber fracture dominated with matrix crack and debonding,and the primary sources of energy consumption are fiber fracture and friction.
基金Funded by the National Natural Science Foundation of China(No.51001117)
文摘Ultra-high molecular weight polyethylene（UHMWPE） fiber/epoxy composites were fabricated by a vacuum assisted resin infused（VARI） processing technology. The curing condition of composites was at a cure temperature of 80 ℃ for 3h in a drying oven. The characteristics of 2.5D（shallow bend-joint and deep straight-joint） structure and 3D orthogonal structure were compared. The failure behavior, flexural strength, and microstructures of both composites were investigated. It was found that the flexural property was closely related to undulation angle θ. The flexural strength of 3D orthogonal structure composite was superior to the other two structures composites with the same weave parameters and resin.
