Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision

This paper hopes to explore the application potential of pentamode materials in the field of shock protection. Hammer percussion tests revealed that the peak strain of the inner-ring front shock surface of the pentamode lattice-ring structure is 103.9% of that of the inner-ring rear shock surface. A...

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Main Authors: Zhenhua Zhang, Bangyi Han
Format: Article
Language:English
Published: MDPI AG 2022-12-01
Series:Crystals
Subjects:
Online Access:https://www.mdpi.com/2073-4352/12/12/1749
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author Zhenhua Zhang
Bangyi Han
author_facet Zhenhua Zhang
Bangyi Han
author_sort Zhenhua Zhang
collection DOAJ
description This paper hopes to explore the application potential of pentamode materials in the field of shock protection. Hammer percussion tests revealed that the peak strain of the inner-ring front shock surface of the pentamode lattice-ring structure is 103.9% of that of the inner-ring rear shock surface. According to the simulation results, for a solid ring of equal mass made of the same base material, the ratio mentioned above reaches 3385.7%. Compared with the solid ring of equal mass made of the same base material, the pentamode lattice-ring structure saw a decline of 65.5% in the peak strain of its inner-ring front shock surface. The distribution laws of the group velocity characterizing energy-flow characteristics were discovered by calculating cell dispersion curves in various layers of the pentamode lattice-ring structure. The laws governing the effects of cellular structure parameters on group velocity anisotropy and pentamode characteristic parameters were also revealed. It was found that the deflection angle of the energy-flow vector is positively correlated with group velocity anisotropy and that the effects of pentamode characteristic parameters <i>π</i> and <i>μ</i> on the deflection angle of the energy-flow vector vary greatly in different value ranges. The deflection angle of the energy-flow vector has a decisive effect on the protection performance of the pentamode lattice-ring structure. The conclusions of this study can provide some theoretical support for the shock protection of submarine structures.
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spelling doaj.art-b630e13228924cce8a3dfa38933b9a642023-11-24T14:10:18ZengMDPI AGCrystals2073-43522022-12-011212174910.3390/cryst12121749Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to CollisionZhenhua Zhang0Bangyi Han1College of Naval Architecture and Ocean, Naval University of Engineering, Wuhan 430033, ChinaCollege of Naval Architecture and Ocean, Naval University of Engineering, Wuhan 430033, ChinaThis paper hopes to explore the application potential of pentamode materials in the field of shock protection. Hammer percussion tests revealed that the peak strain of the inner-ring front shock surface of the pentamode lattice-ring structure is 103.9% of that of the inner-ring rear shock surface. According to the simulation results, for a solid ring of equal mass made of the same base material, the ratio mentioned above reaches 3385.7%. Compared with the solid ring of equal mass made of the same base material, the pentamode lattice-ring structure saw a decline of 65.5% in the peak strain of its inner-ring front shock surface. The distribution laws of the group velocity characterizing energy-flow characteristics were discovered by calculating cell dispersion curves in various layers of the pentamode lattice-ring structure. The laws governing the effects of cellular structure parameters on group velocity anisotropy and pentamode characteristic parameters were also revealed. It was found that the deflection angle of the energy-flow vector is positively correlated with group velocity anisotropy and that the effects of pentamode characteristic parameters <i>π</i> and <i>μ</i> on the deflection angle of the energy-flow vector vary greatly in different value ranges. The deflection angle of the energy-flow vector has a decisive effect on the protection performance of the pentamode lattice-ring structure. The conclusions of this study can provide some theoretical support for the shock protection of submarine structures.https://www.mdpi.com/2073-4352/12/12/1749pentamode materiallattice materialshock stress waveenergy-flow vectordispersion curve
spellingShingle Zhenhua Zhang
Bangyi Han
Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
Crystals
pentamode material
lattice material
shock stress wave
energy-flow vector
dispersion curve
title Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
title_full Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
title_fullStr Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
title_full_unstemmed Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
title_short Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision
title_sort regulation mechanism of the shock waves in a pentamode lattice ring structure subjected to collision
topic pentamode material
lattice material
shock stress wave
energy-flow vector
dispersion curve
url https://www.mdpi.com/2073-4352/12/12/1749
work_keys_str_mv AT zhenhuazhang regulationmechanismoftheshockwavesinapentamodelatticeringstructuresubjectedtocollision
AT bangyihan regulationmechanismoftheshockwavesinapentamodelatticeringstructuresubjectedtocollision