摘要
为了揭示2.5D C/SiC陶瓷基复合材料在铣削加工过程中的去除机理及表面损伤特性,开展了其传统铣削和超声振动辅助铣削实验,建立了两类铣削工况下的三维数值模型。结果表明,相对于传统铣削,超声振动辅助铣削在其高频的交变载荷下,降低材料的微切削厚度,减小材料的变形挠度从而使径向和切向的切削力分别都降低了68%、72%;可有效改善2.5D C/SiC复合材料加工表面损伤,如倾斜断裂面、粗糙断裂面;其加工表面残余压应力明显大于传统铣削;经过实验验证,所建立的数值模型可以有效地模拟材料去除过程和0°、90°纤维的断裂形貌;为2.5D C/SiC复合材料的高效低损伤加工提供了理论依据和指导。
To elucidate the removal mechanism and surface damage characteristics of 2.5D C/SiC ceramic matrix composites during the milling process,experiments were conducted on both traditional milling and ultrasonic vibration-assisted milling.A three-dimensional numerical model was established for both milling conditions.The results indicate that,compared to traditional milling,ultrasonic vibration-assisted milling,under its high-frequency alternating load,reduces the micro-cutting thickness of the material and decreases the material's deformation deflection,leading to a reduction in radial and tangential cutting forces by 68%and 72%respectively.It can effectively improve the surface damage of 2.5D C/SiC composites,such as inclined and rough fracture surfaces.The residual compressive stress on the processed surface is significantly greater than that of traditional milling.The established numerical model has been experimentally verified to effectively simulate the material removal process and the fracture morphology of 0°and 90°fibers.This work provides theoretical basis and guidance for the efficient and low-damage processing of 2.5D C/SiC composites.
作者
杨定成
张小冰
YANG Dingcheng;ZHANG Xiaobing(Zhejiang Dongfang Polytechnic,Zhejiang 325000)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2024年第3期30-37,共8页
Aerospace Materials & Technology
基金
浙江省产学合作同育人项目(121)。
