Analysis of fracture mechanisms and surface quality in drilling of composite materials

Abstract

The aim o f this work is to clarify the interaction mechanisms between the drilling tool and material. Drilling tests were carried out on glass/polyester and carbon/epoxy composites using different twist drills. The cutting tools and machined surfaces were examined by optical microscopy, scanning microscopy and surface profilom etry to study composite damage and tool wear. Among the defects caused by drilling, delamination appears to be the most critical and may occurs a t both the entrance and exit planes. A prediction model o f thrust force fo r drilling without delamination is proposed.

Influence of edge radius of sintered-carbide tip on roughness of machined surface

“…Technology of drilling of composite materials is a classical example (Sedláček, 2008). When machining inhomogeneous materials, composites and heat treated steels, a problem with ductility and tenacity of machining tools appears.…”

Influences of Processing Parameters on Hole Shape Accuracy in Drilling Carbon Fiber Reinforced Composite

“…Tsao [6] used Taguchi method for design of a robust experiment, and obtained the available cutting parameters to make sure good surface roughness. Sedlacek and Humar [7] clarified the interaction mechanisms between the drilling tool and material. By using optical microscopy, scanning microscopy and surface profilometry to study composite damage and tool wear, a prediction model of thrust force for drilling without delamination is proposed.…”