研究目的
To determine the interfacial fracture energy for ‘pop-in’ delaminations in a glass-epoxy system using the indentation method.
研究成果
The interfacial fracture energy of an Epon 828/DEA coating on a soda-lime glass substrate was calculated to be approximately 400 J m–2, which is extremely high compared to previously determined adhesion energies using similar glass-epoxy systems. The technique could possibly be further developed to generate a comparison of the adhesion of a range of different substrate-coating systems.
研究不足
The shear stress contributes to the interfacial debonding, thus the measured adhesion energy is not the same as that measured in a pure opening mode debonding experiment, limiting the ability to directly compare the results in this study to adhesion studies using different test configurations.
1：Experimental Design and Method Selection:
Indentation experiments were performed to induce interfacial delaminations in a glass substrate-epoxy coating system. The analytical solution developed by Rosenfeld et al. (1990) was used to estimate the interfacial fracture energy.
2：Sample Selection and Data Sources:
Test samples consisted of soda-lime glass as the substrate material and a mixture of diglycidyl ether of bisphenol A (Epon 828) cured with diethanolamine (DEA) for the epoxy coating.
3：List of Experimental Equipment and Materials:
A 1/16th inch diameter stainless steel spherical tip indenter, Instron 5565 Universal Testing Machine (UTM), Nanoindenter XP with spherical and Berkovich tip geometries.
4：Experimental Procedures and Operational Workflow:
Indentation experiments were performed at –55°C to generate a residual tensile stress in the epoxy coating. Load, displacement, and acoustic signal were recorded every 2 ms during the experiments.
5：Data Analysis Methods:
The Oliver-Pharr method was used to extract hardness and modulus from indentation load-displacement curves.
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