Damage Formation and Quality Evaluation of Machining Surface of Carbon Fiber Unidirectional Laminates
To improve the cutting quality of composite materials,the influence of the fiber cutting angle,cutting speed and cutting depth on the machinability,subsurface microscopic damage and cutting quality of composite materials from mul-tiple dimensions such as cutting force,thrust force,machined surface roughness and chip formation in orthogonal cutting test are investigated.The results show that the fiber cutting angle is the main factor affecting the machinability of composite ma-terials,and average cutting force generated by inverse fiber cutting(θ＞90°)is 7.58 times higher than that of θ＜90°.Atθ=90°,fiber bending deformation and fiber kinking make the effects of cutting parameters on cutting force and thrust force most significant.By observing the subsurface damage patterns,the cutting mechanism can be divided into four types:inter-face debonding for θ=0°,shear slip for 0°＜θ＜90°,shear fracture for θ=90°,and bending fracture for 90°＜θ＜180°.The machined surface quality is related to cutting force.However,the coupling effects of small cutting depth(h=0.02mm)and medium cutting speed(v=7mm/s)make the cutting process unstable extremely,and the surface roughness and cutting force are independent.High cutting speed and medium cutting depth are recommended for orthogonal cutting of composite materials.
万方数据
维普
