An analysis of drilling of composite materials.

摘要

omposite materials due to their unique nature, microscopical inhomogeneity, anisotropy and laminate structure, require a different approach toward machining analysis than that used for metal cutting. In the drilling of composites, interlaminar cracking, or delamination, is the major damage mechanism to be predicted. The current work provides an analytical model using classic plate theory and linear elastic fracture mechanics to predict the critical thrust and cutting force responsible for the onset of the delamination at the exit and entrance respectively. The higher the interlaminar Mode I fracture toughness of the modulus of elasticity or the thinner the ply thickness is, the larger the allowable thrust and cutting forces are. A new parameter,