Integrally Shunted Piezoelectric Reinforcement for Tailored Frequency-Dependent Passive Damping of Composite Materials

这项研究将探索一种具有增强的固有被动阻尼的结构复合材料的工程方法，并开发适当的建模技术和设计指南。这种方法是基于使用整体分流的压电陶瓷棒作为复合材料的加固元件。由于高度的电弹性耦合，应变会沿着杆产生电压梯度。通过将电极杆端通过集成电阻分流，电流可以通过焦耳加热流动并耗散能量，理论上即使在低纤维体积分数(20%)的环氧树脂中也可以获得非常高的峰值阻尼损耗因数。

This research will explore an approach to the engineering of structural composite materials with enhanced intrinsic passive damping, and to develop appropriate modeling techniques and design guidelines. The approach is based on the use of integrally-shunted piezoceramic rods as reinforcing elements of a composite material. Because of high electroelastic coupling, straining produces voltage gradients along the rods. By shunting the electroded rod ends through an integral resistor, current is allowed to flow and dissipate energy through joule heating, Very high peak damping loss factors are theoretically attainable even at low fiber volume fractions (20%) in epoxy.