Effects of Specialized Drills on Hole Defects of CFRP Laminates
Carbon fiber reinforced plastics (CFRP) have experienced an increasing use in the modern aerospace industry due to their enhanced mechanical properties and flexible structural functions.However, owing to their prominent anisotropy and heterogeneity, drilling CFRP composites is liable to produce serious hole defects, which can decrease the strength and stability of the joining structure.To avoid the hole damage in composites drilling, specialized drill bits are often a primary choice being widely adopted in a real production.This paper aims to study the effects of four specialized drills differing in geometrical characteristics during the drilling of T800/X850 CFRP.The distribution and characteristics of surface defects during cutting of CFRP were studied following the fiber/matrix fracture morphology analysis.A number of drilling experiments were carried out with the aim to evaluate the drilling performance of different drill bits.A scanning electron microscope (SEM) was applied to characterize the drilled hole morphologies with a particular focus on the hole damage occurring in the CFRP laminates.The obtained results indicate that the fiber orientation relative to the cutting direction is a key factor affecting hole morphology, and hole wall defects can be reduced by utilizing specialized drill geometries.Moreover, the multifaceted drill and the dagger drill bit were confirmed outperforming the brad spur drill and the twist drill from the aspect of reducing hole wall damage.
CFRP Drilling Hole wall defects Specialized drill bits Fiber cutting angle
Chao Li Jinyang Xu Qinglong An Ming Chen
State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering,Shanghai Jiao Tong University, Shanghai 200240, PR China
国际会议
上海
英文
321-325
2017-11-19（万方平台首次上网日期，不代表论文的发表时间）