Computational design of resonant phononic crystal for aperiodic stress wave attenuation
ISSN: 0264-4401
Article publication date: 21 July 2020
Issue publication date: 8 February 2021
Abstract
Purpose
This paper aims to propose a design method for attenuating stress waves pressure using soft matrix embedded with particles.
Design/methodology/approach
Based on the phononic crystal theory, the particle composed of hard core and soft coating can form a spring oscillator structure. When the frequency of the wave is close to the resonance frequency of the spring oscillator, it can cause the resonance of the particle and absorb a lot of energy. In this paper, the resonant phononic crystal with three phases, namely, matrix, particle core and coating, is computationally designed to effectively mitigate the stress wave with aperiodic waveform.
Findings
The relationship between the center frequency and width of the bandgap and the geometric and physical parameters of particle core are discussed in detail, and the trend of influence is analyzed and explained by a spring oscillator model. Increasing the radius of hard core could effectively enhance the bandgap width, thus enhancing the effect of stress wave attenuation. In addition, it is found that when the wave is in the bandgap, adding viscosity into the matrix will not further enhance the stress attenuation effect, but will make the stress attenuation effect of the material worse because of the competition between viscous dissipation mechanism and resonance mechanism.
Research limitations/implications
This study will provide a reference for the design of stress wave protection materials with general stress waves.
Originality/value
This study proposes a design method for attenuating stress waves pressure using soft matrix embedded with particles.
Keywords
Acknowledgements
This research is supported by the Science Challenge Project (Grant No. TZ2018001), National Natural Science Foundation of China (Grant No. 11722218, 11972205 and 11302115), the National Key Research Development Program of China (Grant No. 2017YFB0702003) and the Tsinghua University Initiative Scientific Research Program.
Citation
Luo, C., Ning, S., Liu, Z., Li, X. and Zhuang, Z. (2021), "Computational design of resonant phononic crystal for aperiodic stress wave attenuation", Engineering Computations, Vol. 38 No. 2, pp. 895-912. https://doi.org/10.1108/EC-10-2019-0492
Publisher
:Emerald Publishing Limited
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