研究目的
Investigating the in-process determination of fiber orientation for layer accurate laser ablation of CFRP to enhance the bonding strength of reconstruction patches.
研究成果
The developed controlled process for layer accurate laser ablation of CFRP, utilizing OCT for depth measurement and fiber orientation detection, significantly reduces surface roughness and enables precise repair geometries. The method demonstrates the potential for enhancing the bonding strength of reconstruction patches in CFRP parts.
研究不足
The total processing time for controlled, layer-accurate ablation was about 20 hours, which may be considered long for some applications. The method's efficiency in detecting fiber orientation changes in real-time could be further optimized.
1：Experimental Design and Method Selection:
The study employed a controlled laser ablation process using optical coherence tomography (OCT) for optical distance measurement to control the ablation depth with high accuracy. The 2D-Fourier transform of the reconstructed surface topography was used to determine fiber orientation.
2：Sample Selection and Data Sources:
The processed material was CFRP with 60% of the volume consisting of carbon fibers arranged in multiple layers with varying thicknesses and orientations.
3：List of Experimental Equipment and Materials:
A TruMicro 3040 nanosecond laser and an OCT CHRocodile 2 from Precitec were used for material ablation and distance measurement, respectively. The setup included a galvanometer scanner and a telecentric F-Theta lens.
4：Experimental Procedures and Operational Workflow:
The beams were moved over the sample surface in 'PixelMode', allowing selective ablation based on OCT measurements. The surface topography was reconstructed after each pass to determine fiber orientation.
5：Data Analysis Methods:
The arithmetical mean height of the surface (Sa) was calculated to compare the results of controlled and conventional ablation. The 2D-Fourier transform was used to analyze the distribution and orientation of spatial frequencies.
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