研究目的
To mitigate the strains transferred from structural members to PV cells through the partial composite action provided by low-modulus adhesives.
研究成果
The study demonstrates that low-modulus adhesives can effectively mitigate the strains transferred from structural members to PV cells, thereby preventing local buckling and debonding that could degrade electrical performance. The strain transfer ratio is influenced by the shear modulus and thickness of the adhesive layer as well as the elastic modulus, thickness, and length of the PV cell. Theoretical and FE analyses validated the experimental results, providing a basis for design suggestions in BIPV applications.
研究不足
The study is limited to in-plane compressive loadings and does not explore other types of structural loads or environmental conditions that may affect the performance of the BIPV components.
1：Experimental Design and Method Selection:
Specimens were fabricated by bonding amorphous silicon (a-Si) PV cells to glass fibre reinforced polymer (GFRP) structural components by an adhesive layer of 0.5- or 2.0-mm thickness. Two types of adhesives were used including a two-part rigid epoxy adhesive and a low-modulus silicone adhesive. These integrations were then submitted to in-plane compressive loadings.
2：5- or 0-mm thickness. Two types of adhesives were used including a two-part rigid epoxy adhesive and a low-modulus silicone adhesive. These integrations were then submitted to in-plane compressive loadings.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The stress-strain behaviour and elastic modulus of the adhesives and the PV cells were determined individually by tensile coupon tests.
3：List of Experimental Equipment and Materials:
An Instron 50 kN machine, a data logger (dataTaker DT515), an extensometer (MTS LX500), and a laser extensometer (MTS LX500) were used.
4：Experimental Procedures and Operational Workflow:
The specimens were loaded up to 800 kN (approximately 80% ultimate load of the GFRP section) and then unloaded gradually. The compression load, distance change between the reflectors, strains of the GFRP SHS and VOC of the PV cells were recorded.
5：Data Analysis Methods:
The electrical performance of the specimens was continuously monitored during the mechanical loading and unloading processes. A theoretical modelling was further developed to understand the strain transfer behaviour of the adhesive layer through the resulting full or partial composite action.
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