Finite element analysis of the electro-mechanical behaviors of piezocomposite bimorph energy harvesters under static and dynamic loadings

IF 7.7 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Navid Dastgir , Reza Ansari , Mohammad Kazem Hassanzadeh-Aghdam , Saeid Sahmani
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Abstract

This study uses a finite element method to investigate electro-mechanical behaviors of bimorph cantilever beams composed of a steel substrate and two layers of a piezocomposite made of PZT-5H fiber/PVDF materials. The properties of the representative volume element of piezocomposites are determined by the numerical simulation based on the micromechanical homogenization method. Then, eigenfrequency and static analyses are performed, followed by a comprehensive dynamic study incorporating time-dependent analysis under sinusoidal harmonic loadings at two different excitation frequencies. A parametric study is performed to evaluate natural frequencies, mode shapes, displacement, strain, stress, electric potential, and electric field of the piezocomposite bimorph harvester for three different fiber volume fractions. The results demonstrate that increasing volume fraction leads to better electro-mechanical properties of piezocomposite bimorph harvesters, with resonance occurring at elevated frequencies. Additionally, an increased volume fraction results in reduced displacement and strain, while simultaneously amplifying the electric field and electric potential under static loadings. Dynamic loading analysis reveals that piezocomposite bimorph beams with a higher volume fraction exhibit higher electric potential and electric field, reaching equilibrium in a shorter duration. A frequency response analysis is conducted on the bimorph beam with varying cross-sections and volume fractions. The trapezoidal beam yields better electrical outputs as compared to the rectangular and triangular beams. The obtained mechanical behaviors by the present simulation are found to be in good agreement with those predicted through other researchers.
静、动载荷作用下压电复合材料双晶片能量采集器机电性能的有限元分析
本研究采用有限元方法研究了由钢基板和两层PZT-5H纤维/PVDF复合材料组成的双晶悬臂梁的机电性能。基于细观力学均匀化方法,通过数值模拟确定了具有代表性的压电复合材料体积元的性能。然后,进行了特征频率和静态分析,随后进行了综合动态研究,包括两种不同激励频率下正弦谐波载荷下的时间相关分析。参数研究进行了评估的固有频率,模态振型,位移,应变,应力,电势和电场的压电复合材料双晶片收获三种不同的纤维体积分数。结果表明,体积分数的增加导致压电复合双晶片收割机的机电性能得到改善,共振发生在更高的频率。此外,体积分数的增加导致位移和应变的减小,同时在静态载荷下放大电场和电势。动加载分析表明,体积分数越高的压电复合材料双晶片梁具有更高的电势和电场,在更短的持续时间内达到平衡。对具有不同截面和体积分数的双晶圆梁进行了频率响应分析。与矩形和三角形光束相比,梯形光束产生更好的电输出。通过模拟得到的力学行为与其他研究者的预测结果吻合较好。
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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