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Wavelike fracture pattern in a metallic glass: a Kelvin-Helmholtz flow instability

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Title: Wavelike fracture pattern in a metallic glass: a Kelvin-Helmholtz flow instability
Authors: 蒋敏强, Wilde G, Qu CB, Jiang F, Xiao HM, Chen JH, Fu SY, 戴兰宏, Jiang, MQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Publication Year: 2014
Collection: IMECH-IR (Institute of Mechanics, Chinese Academy of Sciences) / 中国科学院力学研究所机构知识库
Subject Terms: Metallic Glass, Kelvin-helmholtz Instability, Fracture Pattern, Physics, Q3, channel flow, 分离流, separation flow, 分离流动, flow instability, rayleigh taylor instability, fluid flow, chemically reactive flow, compressible flow, confined flow, flow confinement, couette flow, external flows, flow, gas dynamics, reynolds number, stokes flow, stokes law (fluid mechanics), fluid instability, taylor instability, flow separation, flow reattachment, separated flow, microchannel flow, rayleigh-benard instability
Description: We report a wavelike fracture pattern in a Zr-based bulk metallic glass that has been deformed under quasi-static uniaxial tensions between room temperature (300K) and liquid nitrogen temperature (77K). We attribute this wavelike pattern to a Kelvin-Helmholtz flow instability that occurs at certain interfaces between local cracking/softening regions. The instability criterion for the pattern formation is achieved via a hydrodynamic perturbation analysis, and furthermore, an instability map is built which demonstrates that the shear velocity difference on both sides of the interface is the main destabilizing factor. Finally, the characteristic instability time (the inverse of the instability growth rate) is explored by seeking the dispersion relation in the dominant (fastest) instability mode. The results increase the understanding of the flow and fracture of metallic glasses as well as the nature of their liquid structures.
Document Type: report
Language: English
Relation: PHILOSOPHICAL MAGAZINE LETTERS; Jiang MQ,Wilde G,Qu CB,et al. Wavelike fracture pattern in a metallic glass: a Kelvin-Helmholtz flow instability[J]. PHILOSOPHICAL MAGAZINE LETTERS,2014,94(10):669-677.; http://dspace.imech.ac.cn/handle/311007/49563; http://dx.doi.org/10.1080/09500839.2014.955549
DOI: 10.1080/09500839.2014.955549
Availability: http://dspace.imech.ac.cn/handle/311007/49563
https://doi.org/10.1080/09500839.2014.955549
Accession Number: edsbas.C446419A
Database: BASE
Description
Abstract:We report a wavelike fracture pattern in a Zr-based bulk metallic glass that has been deformed under quasi-static uniaxial tensions between room temperature (300K) and liquid nitrogen temperature (77K). We attribute this wavelike pattern to a Kelvin-Helmholtz flow instability that occurs at certain interfaces between local cracking/softening regions. The instability criterion for the pattern formation is achieved via a hydrodynamic perturbation analysis, and furthermore, an instability map is built which demonstrates that the shear velocity difference on both sides of the interface is the main destabilizing factor. Finally, the characteristic instability time (the inverse of the instability growth rate) is explored by seeking the dispersion relation in the dominant (fastest) instability mode. The results increase the understanding of the flow and fracture of metallic glasses as well as the nature of their liquid structures.
DOI:10.1080/09500839.2014.955549