Progressive damage in terms of resonant frequency in aramid samples to UV light exposure

A recently conceived experimental testing device, based on an optical measurement system and electro-magnetic driving force was used to characterize damping and the non-linear material response, and to carry out an experimental campaign on several Kevlar® fibre samples. The samples were exposed to UV light for different lengths of time. The results show that it is possible to observe an increase in the non-linear response of the material even at low vibratory amplitudes and that the quality factor tends to decrease when the material is damaged.

近期设计的一款基于光学测量系统和电磁驱动力的实验测试装置，被应用于表征阻尼以及非线性材料响应，并在数个凯夫拉®纤维样品上展开了一系列实验研究。样品被暴露于不同时间段的紫外光下。实验结果显示，即使在低振幅振动条件下，材料的非线性响应亦能观察到显著增强，且当材料受损时，其品质因数倾向于下降。