arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09344cond-mat.dis-nncond-mat.soft
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玻璃中的机械β弛豫及其与高温脉冲振动双峰现象的关系

On the mechanical beta relaxation in glass and its relation to the double-peak phenomenon in impulse excited vibration at high temperatures

Jianbiao Wang, Xu Wang, Haihui Ruan

摘要:

本文建立了一个粘弹性模型,揭示了玻璃的α-β弛豫与脉冲激振实验中双峰现象的关系。在模型中,势能景观(PEL)图片的正常模式分析(NMA)被用来描述机械α和β松弛在玻璃材料。该模型表明,当β弛豫峰的频率接近试件的固有频率时,小的β弛豫可导致明显的双峰现象。理论预测得到了氟硅酸盐玻璃梁在跨中脉冲激励下的声频谱的验证。此外,实验结果表明氟硅酸盐玻璃S-FSL 5中的β弛豫频率的负温度依赖性,这可以基于液体状区域中的碎片化氧化物网络补丁的物理图像来解释。

英文摘要:

A viscoelastic model is established to reveal the relation between alpha-beta relaxation of glass and the double-peak phenomenon in the experiments of impulse excited vibration. In the modelling, the normal mode analysis (NMA) of potential energy landscape (PEL) picture is employed to describe mechanical alpha and beta relaxations in a glassy material. The model indicates that a small beta relaxation can lead to an apparent double-peak phenomenon resulted from the free vibration of a glass beam when the frequency of beta relaxation peak is close to the natural frequency of specimen. The theoretical prediction is validated by the acoustic spectrum of a fluorosilicate glass beam excited by a mid-span impulse. Furthermore, the experimental results indicate a negative temperature-dependence of the frequency of beta relaxation in the fluorosilicate glass S-FSL5 which can be explained based on the physical picture of fragmented oxide-network patches in liquid-like regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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