研究目的
Investigating the effect of a CO2 laser texturing on the mechanical resistance on mode II of bonded joints realized in CFRP and epoxy adhesive.
研究成果
The laser treatment significantly increased the mechanical resistance of ENF joints by at least 76%. The numerical model showed good agreement with experimental results but had limitations in predicting unstable crack propagation. Future studies should explore the effects of laser texturing under more complex stress states.
研究不足
The numerical model exhibited limitations for forecast of instable cracks propagation. Further studies are needed to estimate the effect of the laser texturing on the fracture toughness under mode I and mixed-mode.
1：Experimental Design and Method Selection:
The study involved an experimental and numerical approach to assess the effect of laser texturing on ENF joints. The methodology included the use of a CO2 laser system for surface treatment and finite element analysis for simulation.
2：Sample Selection and Data Sources:
ENF specimens were produced using a unidirectional carbon/epoxy prepreg. The specimens were treated with varying intensities of laser texturing.
3：List of Experimental Equipment and Materials:
A CO2 laser system (GIOTTO CO2 25W by SEI S.p.A.), a 100kN load cell machine, and EA9309.3NA epoxy adhesive by Hysol were used.
4：3NA epoxy adhesive by Hysol were used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser treatment parameters were optimized to minimize damage. The ENF specimens were tested under a displacement rate of 5.1 mm/min.
5：1 mm/min.
Data Analysis Methods:
5. Data Analysis Methods: The critical energy release rate (Gc) was calculated using the modified beam theory method from experimental data.
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