Analysis of process-induced damage in remote laser cut carbon fibre reinforced polymers

Abstract

In this contribution a method is introduced that allows for a linkage between the processinduced structural damage and the fracture behaviour. Based on an anisotropic elastic material model, different modelling approaches for initial damage effects are introduced and compared. The approaches are applied to remote laser cut carbon fibre reinforced polymers in order to model various thermally induced damage effects like chemical decomposition, micro-cracks and delamination. The dimensions of this heat affected zone are calculated with 1D-heat conduction. In experiment and simulation milled and laser cut specimens with different process parameters are compared in order to quantify the impact of the cutting technology on the fracture behaviour. For this purpose open hole specimens were used.

Analysis of the remote laser cutting process induced damage in carbon fibre reinforced polymers

“…The aim of this cutting process analysis is the identification of its influence on the structural properties. For this pupose a further goal is the mapping of the process simulation results on the mechanical models [2] for a closed process-structureproperty linkage.…”

“…Here remote laser cutting is a fast and tool-wear free alternative, but the heat input in the material causes a Heat Affected Zone (HAZ) [1], which also influences the mechanical parameters of the material [2]. The aim of this contribution is the analysis of the cutting process with a process simulation.…”

Laser Irradiation Behavior of Carbon Fiber Epoxy Resin Composites with Laminar Structure

“…CFRP composites are widely fabricated by laser processing such as laser cutting, laser drilling, laser surface treatment, and so on [29,30]. As laser is developing to higher power, aerospace vehicles are facing its threat of serious damage.…”

Improving laser cutting quality of carbon fiber-reinforced plastics by improving laser beam pointing stability

“…[1][2][3] The conventional machining of CFRP results in delamination, fiber pullout, burrs, tool wear, and low efficiency due to their anisotropic and inhomogeneous characteristics, which limits the development of CFRP applications. 4,5 Simultaneously, the difficulties in processing CFRP have promoted the research of innovative technologies such as electric discharge machining (EDM), [6][7][8] abrasive water jet machining (AWJM), 9,10 and ultrasonic vibration-assisted machining (UVAM). 11 However, the relatively low conductivity of CFRP prevents EDM from becoming an effective choice.…”

“…Carbon fiber-reinforced plastics (CFRP) are increasingly used in the automotive and aerospace industries due to their excellent heat resistance, low thermal expansion coefficient, light weight, high strength, corrosion resistance, and excellent mechanical properties 1 – 3 The conventional machining of CFRP results in delamination, fiber pullout, burrs, tool wear, and low efficiency due to their anisotropic and inhomogeneous characteristics, which limits the development of CFRP applications 4 , 5 . Simultaneously, the difficulties in processing CFRP have promoted the research of innovative technologies such as electric discharge machining (EDM), 6 – 8 abrasive water jet machining (AWJM), 9 , 10 and ultrasonic vibration-assisted machining (UVAM) 11 .…”