研究目的
To propose a new experimental protocol using ultraviolet digital image correlation for characterizing thermoplastic prepreg composites at temperatures above their melting point, addressing issues like light reflections and enabling deformation field analysis.
研究成果
The UV-DIC method successfully characterizes thermoplastic composites at high temperatures, avoiding reflection issues and providing accurate deformation fields. It reveals heterogeneities in shear fields and discrepancies with theoretical models, enabling improved constitutive modeling and process design for thermostamping.
研究不足
The method requires opening the oven door for speckle application, which can alter temperature and potentially degrade the resin. Incremental correlation leads to error accumulation. Slip phenomena and pattern degradation occur at high loads. Not suitable for dry fabrics without adhesive support. Testing must be done in a dark environment.
1：Experimental Design and Method Selection:
The protocol uses ultraviolet digital image correlation (UV-DIC) with a photoluminescent powder speckle pattern to avoid light reflections. It involves heating the specimen above its melting point, applying the speckle pattern, and using UV light for illumination.
2：Sample Selection and Data Sources:
A commercially available pre-consolidated plate of glass fiber yarns and polypropylene matrix (TEPEX Dynalite 104-RG600(4)) is used, with specimens of 150 mm length and 60 mm width.
3：List of Experimental Equipment and Materials:
Includes an isothermal oven, tensile machine, UV light source (DYMAX Blue Wave 50), camera with lens and filters, photoluminescent powder (TechnoGlow), and software like Vic2D-2006 and MATLAB.
4：Experimental Procedures and Operational Workflow:
Steps involve placing the specimen in the setup, heating it 30°C above melting temperature, projecting a powder/water mixture to apply the speckle pattern, stabilizing temperature, and performing bias extension tests under UV light with data acquisition.
5：Data Analysis Methods:
Images are processed using Vic2D-2006 for incremental correlation, displacement fields are exported to MATLAB for finite element mesh creation and shear angle calculation, and results are visualized in Paraview.
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