Damage mechanism of carbon fiber reinforced plastic pipe based on reverse and forward curvature drilling

Metal-composite shaft parts composed of metal joints and composite pipes have attracted extensive attention in the fields of unmanned aerial vehicles (UAVs) and new energy vehicles because of their advantages of light weight, high strength, and stable axial load transmission. Hole making is a necessary process to ensure connections between metal joints and composite pipes. For the drilling of a small-diameter composite pipe, the onetime drilling method which includes reverse and forward curvature drilling is usually used to ensure the stability of axial load transmission of the metal-composite shaft. An in-depth understanding of the damage mechanism of hole making in a composite pipe can help to guide hole making technology for composite pipes. In this study, the material damage mechanism of reverse and forward curvature drilling of the carbon fiber reinforced plastic (CFRP) pipe was analyzed by theoretical analysis and finite element modeling and simulation. Verification experiments were designed to capture the cutting force and damage morphology of the entrance and exit of holes. The effect of machining parameters on material damage was revealed, and reasonable suggestions were given for the selection of machining parameters in reverse and forward curvature drilling.

Automated summary

Metal-composite shaft parts composed of metal joints and composite pipes have advantages of lightweight, high strength, and stable axial load transmission, making them highly sought after in the fields of unmanned aerial vehicles and new energy vehicles. This study analyzes the material damage mechanism of hole-making in carbon fiber reinforced plastic pipes through theoretical analysis and experimental verification, providing reasonable suggestions for machining parameters selection.