Influence du graphène sur la température de détourage de composite carbone-époxy

Abstract

In recent decades, carbon fiber reinforced (CFRP) products have known important development and use by manufacturers working in high-performance fields. These ever more massive uses are due to their interesting mechanical properties with a relatively low weight in comparison with the metals and alloys traditionally used. In addition, a wide range of manufacturing processes exist and allow the manufacture of precise and custom geometries. Nonetheless, it is often necessary to rework the parts in machining in order to adjust the parts to geometric tolerances and thus comply with their design. However, the machining of recent composite materials encounters unprecedented difficulties such as the mechanical defects generated (delamination, cracking, etc.) and / or the thermal damage (matrix burn, affectation of the cutting tool). The manufacturing of CFRPs incorporating graphene has been made possible by the development of an innovative manufacturing method guaranteeing the most constant possible fiber content by volume as well as a homogeneous distribution of graphene. This allowed us to highlight the effects of graphene. During machining, a thermal camera was used to confirm the temperature results recorded with thermocouples bounded to the cutting tool. The study focused on the influence of graphene on machining. To do this, two materials were faced with machining with cutting parameters considered as optimal. Only one polycrystalline diamond (PCD) cutting tool was used. First, the nanocomposite (graphene plus epoxy) made it possible to highlight the influence of graphene on the cut (temperature increase in the presence of graphene) without influencing the wear of the tool. Then, the graphene was incorporated into CFRP with three different concentrations (0 / 0.25 / 3% wt) and made it possible to demonstrate an increase in the cutting temperature in the presence of graphene. In contrast, between plate 0 and 3%wt, a significant decrease in temperature in the cutting area (up to 32°C on average) and a significant decrease in feed force (66 newtons on average) was highlighted.

Date	3 Dec 2020
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Jean-François Chatelain (Supervisor) & Claudiane Ouellet-Plamondon (Co-supervisor)