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Experimental Characterization of the Torsional Damping in CFRP Disks by Impact Hammer Modal Testing

机译：通过冲击锤模态测试表征CFRP盘中的扭转阻尼

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Composite materials are widely used for their peculiar combination of excellent structural, mechanical, and damping properties. This work presents an experimental study on the dissipation properties of disk-shaped composite specimens exploiting vibration tests. Two different polymer matrix composites with the same number of identical laminae, but characterized by different stacking sequences, namely unidirectional and quasi-isotropic configurations, have been evaluated. An ad-hoc steel structure was designed and developed to reproduce an in-plane torsional excitation on the specimen. The main idea of the proposed approach relies on deriving the damping properties of the disks by focusing on the modal damping of the overall vibrating structure and, in particular, using just the first in-plane torsional deformation mode. Experimental torsional damping evaluations were conducted by performing vibrational hammer excitation on the presented setup. Two methods were proposed and compared, both relying on a single-degree-of-freedom (SDOF) approximation of the measured frequency response function (FRF).
机译：复合材料因其独特的结构，机械和阻尼特性而被广泛使用。这项工作提出了利用振动试验对圆盘状复合材料的耗散特性进行实验研究。已经评估了具有相同数量相同薄片但具有不同堆叠顺序（即单向和准各向同性构型）的两种不同的聚合物基复合材料。设计并开发了一种特殊的钢结构，以在样本上重现面内扭转激励。所提出的方法的主要思想依赖于通过集中于整个振动结构的模态阻尼，特别是仅使用第一面内扭转变形模式来导出盘的阻尼特性。通过在提出的装置上执行振动锤激励来进行实验扭转阻尼评估。提出并比较了两种方法，两种方法都依赖于测得的频率响应函数（FRF）的单自由度（SDOF）近似值。

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