研究目的
To analyze the energy collection efficiency of PVDF/TiO2 nano-composite film in compression and shear modes and to study the nonlinear piezoelectric effect under large stress.
研究成果
The PVDF/TiO2 nano-composite film is more efficient in collecting energy under shear mode than compression mode. Nonlinear effects were observed in piezoelectric constant and piezoelectric coupling coefficient under large stress, indicating potential for higher energy conversion efficiency in shear mode.
研究不足
The study focuses on PVDF/TiO2 nano-composite films and their performance under specific conditions (compression and shear modes). The findings may not be directly applicable to other materials or under different conditions.
1：Experimental Design and Method Selection:
The study established compression and shear mode experimental platforms for energy harvesting. The efficiency of energy collection and nonlinear piezoelectric effects were analyzed under these modes.
2：Sample Selection and Data Sources:
PVDF/TiO2 nano-composite films were prepared and tested under cyclic stress to measure electric energy generation.
3：List of Experimental Equipment and Materials:
Li Chuang electro-hydraulic servo fatigue machine was used to apply cyclic stress, and a digital multimeter (DMM) – KEITHLEY was used to collect responses.
4：Experimental Procedures and Operational Workflow:
The film was subjected to sinusoidal periodic strain, and the generated responses were measured.
5：Data Analysis Methods:
The relationship between electromechanical coupling coefficients and parameters of composite thin film piezoelectric stress was established using experimental data.
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