Frequency Response of Layered Media under Different Conditions of Interlayer Adhesion by the Example of Road Pavement

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL
A. N. Tiraturyan, E. V. Uglova
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Abstract

The dynamic response of a layered medium (using road pavement as an example) to a dynamic impact for the conditions of cohesive contact between individual layers and complete slippage is analyzed. To solve this problem, a mathematical model of the dynamic stress-strain state of a layered half-space is used, based on solving the Lamé equation in displacements, using the Hankel integral transform, amplitude–frequency characteristic (AFC) of accelerations on the medium surface under study, obtained directly from the displacement AFCs. In the course of a numerical experiment on this model, it is found that the case of adhesive contact between the layers of the road pavement corresponds to the presence of one clearly expressed frequency extremum on the acceleration AFC. The case of “complete slippage” corresponds to the presence of a number of frequency extrema on the acceleration AFC. In this case, when modeling the full slip at the boundary of the half-space lower layer and the underlying half-space and varying the elastic modulus of the half-space, the presence of a clearly defined frequency extremum in the range of 426–531 Hz is noted, presumably corresponding to oscillations of the underlying half-space itself. The established patterns can be used to improve the methods and means of non-destructive testing of layered media, in particular to increase the information content of their structural state, which is necessary for making decisions on repair or overhaul.

Abstract Image

不同层间附着条件下层状介质的频率响应——以路面为例
分析了层状介质(以路面为例)在各层间有粘性接触和完全滑移条件下的动力冲击响应。为了解决这一问题,在求解位移中的lam方程的基础上,利用Hankel积分变换,建立了层状半空间的动态应力-应变状态的数学模型,直接从位移的幅频特性(AFC)中得到所研究介质表面的加速度的幅频特性(AFC)。在该模型的数值实验过程中,发现路面层间的粘接接触情况对应于加速度AFC上存在一个明确表示的频率极值。“完全滑移”的情况对应于加速度AFC上存在多个频率极值。在这种情况下,当模拟半空间下层和底层半空间边界的全滑移并改变半空间的弹性模量时,注意到在426-531 Hz范围内存在明确定义的频率极值,可能对应于底层半空间本身的振荡。所建立的模式可用于改进层状介质无损检测的方法和手段,特别是增加层状介质结构状态的信息含量,这是决定修复或大修所必需的。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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