Dynamic contact in multiferroic energy conversion
Dynamic contact in multiferroic energy conversion
复制标题
多铁性能量转换中的动态接触
DOI：
10.1016/j.ijsolstr.2018.02.034
复制
发表时间：
2018
影响因子：
3.6
通讯作者：
Wang Q.
中科院分区：
文献类型：
--
作者：
Zhang X.;Wang Z.;Shen H.;Wang Q.
本文提出了一种半解析模型（SAM），用于模拟刚性球体与多铁性磁电弹性（磁电弹性）薄膜表面在外力作用下的动态接触。分析推导了加载速度在动态过程中的频率响应函数（FRFs）及其转换为薄膜的影响系数（IC）。采用共轭梯度法（CGM）和快速傅里叶变换（FFT）等快速数值方法，对接触压力、电磁势和次表面应力的分布和变化规律进行了数值求解。所提出的模型被实施来分析加载速度，膜厚度，和球半径的动态响应，包括压力/应力和电/磁势的影响。选择一个能量转换因子来评价能量转换的性能。此外，进行灵敏度分析，以评估材料特性及其耦合对机械-电/磁能量转换效率的影响。
This paper reports a semi-analytical model (SAM) for simulating the dynamic contact of a rigid sphere and the surface of a multiferroic magnetoelectroelastic (MEE) film under an increasing applied force. The frequency response functions (FRFs) and their conversion into influence coefficients (ICs) for the MEE film are analytically derived, incorporating the loading velocity in a dynamic process. Fast numerical techniques, including the conjugate gradient method (CGM) and the fast Fourier transform (FFT), are employed for efficient numerical solutions to the dynamic contact behaviors, including the distributions and variations of contact pressure and electric/magnetic potentials, as well as subsurface stresses. The proposed model is implemented to analyze the influences of loading velocity, film thickness, and sphere radius on the dynamic MEE responses, including pressure/stresses and electric/magnetic potentials. An energy conversion factor is selected to evaluate the performance of MEE energy conversion. Furthermore, a sensitivity analysis is conducted to evaluate the influence of material properties and their coupling on the efficiency of mechanical–electric/magnetic energy conversion.