Abstract
High-strength carbon fiber reinforced polymer (CFRP) composites have become popular materials to be utilized in the aerospace and automotive industries, due to their unique and superior mechanical properties. An understanding of cutting temperatures is rather important when dealing with high-strength CFRPs, since machining defects are likely to occur because of high temperatures (especially in the semi-closed drilling process). The friction behavior at the flank tool-workpiece interface when drilling CFRPs plays a vital role in the heat generation, which still remains poorly understood. The aim of this paper is to address the friction-induced heat based on two specially-designed tribometers to simulate different sliding velocities, similar to those occurring along the flank tool-work interface in drilling. The elastic recovery effect during the drilling process was considered during the tribo-drilling experiments. The drilling temperatures were calculated by the analytical model and verified by the in-situ experimental results gained using the embedded thermocouples into the drills. The results indicate that the magnitudes of the interfacial friction coefficients between the cemented carbide tool and the CFRP specimen are within the range between 0.135–0.168 under the examined conditions. Additionally, the friction caused by the plastic deformation and elastic recovery effects plays a dominant role when the sliding velocity increases. The findings in this paper point out the impact of the friction-induced heat and cutting parameters on the overall drilling temperature.
Highlights
High-strength carbon fiber reinforced polymer (CFRP) composites have become one of the most popular materials in many industries, including aerospace, automobile, etc., due to their excellent mechanical properties of high specific tensile strength, fracture toughness, modulus and fatigue strength
The composite plates investigated in this work were multilayer high-strength CFRP laminates fabricated by carbon fibers and epoxy prepregs containing a 65% fiber volume fraction
Two different structures of CFRP specimens were adopted in the present work consisting of a standard laminate for the drilling tests and a modified laminate for the pin-on-disc tests that was milled to expose the contact surface according to the tool geometry, analogous to the flank tool-work interface between the cutting edge and the workpiece
Summary
High-strength carbon fiber reinforced polymer (CFRP) composites have become one of the most popular materials in many industries, including aerospace, automobile, etc., due to their excellent mechanical properties of high specific tensile strength, fracture toughness, modulus and fatigue strength. CFRP components are manufactured by prepregs utilizing carbon fibers impregnated with thermoset resin. Prepreg sheets are formed by laying up and heat curing. A variety of the cured CFRP parts still require a secondary machining to satisfy the final dimensional accuracy, since the layered prepreg sheets possess a redundant edge. Mechanical joining is inevitable for the assembly process of CFRP parts. Compared with the joining of metals by welding, CFRP composites are often assembled via the use of bolt or rivet connections, requiring
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