研究目的
The machinability of titanium (Ti) and carbon fiber reinforced plastic (CFRP) (Ti/CFRP/Ti) laminates using CO2 laser is presented in this work. The effect of line energy and laser frequency on output responses such as heat affected zone (HAZ), taper angle (TA), metal composite interface (MCI) damage, surface roughness, dross height, and circularity were investigated.
研究成果
The study concluded that laser drilling of Ti/CFRP/Ti laminates established a threshold behavior with line energy of 72 J/mm required to machine the materials. SAM analysis proved useful in capturing the extended HAZ width and MCI damage. The study also found that higher frequency and lower line energy can significantly improve the hole quality, while higher line energy is recommended for dross free machining.
研究不足
The study focused on the machinability of Ti/CFRP/Ti laminates using CO2 laser drilling. The research did not explore other non-traditional machining methods or compare them with CO2 laser drilling. The study also did not investigate the effect of other laser parameters beyond line energy and frequency.
1：Experimental Design and Method Selection:
The study involved laser drilling of Ti/CFRP/Ti laminates using a CO2 laser in modulated pulse mode. The effect of line energy and laser frequency on hole quality was investigated.
2：Sample Selection and Data Sources:
Ti/CFRP/Ti stack laminates were fabricated with eight layers of UD carbon fabric placed between two Ti sheets. Samples were prepared using hand lay-up technique and vacuum bagging.
3：List of Experimental Equipment and Materials:
CO2 laser machining (Tru Flow TRUMPF 4000), nitrogen as an assisted gas, Leica Stereo Microscope S6D, ImageJ v
4：50 for image processing, Supra 55 SEM, SAM (Model:
V400), μ-CT (Xradia XRM-500), micro-hardness tester (FM-800).
5：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Laser drilling was performed at different line energies and frequencies. Machining induced damage was analyzed in terms of HAZ width and MCI damage factor using SAM and SEM technique. Machined surface quality was evaluated in terms of taper angle, dross height, circularity and surface roughness.
6：Data Analysis Methods:
HAZ width, TA, MCI damage factor, surface roughness, dross height, and circularity were measured and analyzed. SEM, SAM, and μ-CT were used for damage analysis.
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