Finite element analysis of mechanical stability of coarsened nanoporous gold

Hoon Hwe Cho; Yu Chen Karen Chen-Wiegart; David C. Dunand

doi:10.1016/j.scriptamat.2016.01.011

Finite element analysis of mechanical stability of coarsened nanoporous gold

Hoon Hwe Cho, Yu Chen Karen Chen-Wiegart, David C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The mechanical stability of nanoporous gold (np-Au) at various stages of thermal coarsening is studied via finite element analysis under volumetric compression using np-Au architectures imaged via X-ray nano-tomography. As the np-Au is coarsened thermally over ligament sizes ranging from 185 to 465 nm, the pore volume fraction is determinant for the mechanical stability of the coarsened np-Au, unlike the curvature and surface orientation of the ligaments. The computed Young's modulus and yield strength of the structures are compared with the Gibson-Ashby model. The geometry of the structures determines the locations where stress concentrations occur at the onset of yielding.

Original language	English (US)
Pages (from-to)	96-99
Number of pages	4
Journal	Scripta Materialia
Volume	115
DOIs	https://doi.org/10.1016/j.scriptamat.2016.01.011
State	Published - Apr 1 2016

Keywords

Coarsened nanoporous gold
Finite element (FE) analysis
Mechanical stability
Surface characteristics
Volume fraction

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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title = "Finite element analysis of mechanical stability of coarsened nanoporous gold",

abstract = "The mechanical stability of nanoporous gold (np-Au) at various stages of thermal coarsening is studied via finite element analysis under volumetric compression using np-Au architectures imaged via X-ray nano-tomography. As the np-Au is coarsened thermally over ligament sizes ranging from 185 to 465 nm, the pore volume fraction is determinant for the mechanical stability of the coarsened np-Au, unlike the curvature and surface orientation of the ligaments. The computed Young's modulus and yield strength of the structures are compared with the Gibson-Ashby model. The geometry of the structures determines the locations where stress concentrations occur at the onset of yielding.",

keywords = "Coarsened nanoporous gold, Finite element (FE) analysis, Mechanical stability, Surface characteristics, Volume fraction",

author = "Cho, {Hoon Hwe} and Chen-Wiegart, {Yu Chen Karen} and Dunand, {David C.}",

note = "Funding Information: This research was supported by the Dongbu Cultural Foundation . The X-ray nano-tomography data were originally collected at Advanced Photon Source (APS) as detailed in Ref. [14] . Use of APS is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences , under contract no. DE-AC02-06CH11357 .",

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doi = "10.1016/j.scriptamat.2016.01.011",

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T1 - Finite element analysis of mechanical stability of coarsened nanoporous gold

AU - Cho, Hoon Hwe

AU - Chen-Wiegart, Yu Chen Karen

AU - Dunand, David C.

N1 - Funding Information: This research was supported by the Dongbu Cultural Foundation . The X-ray nano-tomography data were originally collected at Advanced Photon Source (APS) as detailed in Ref. [14] . Use of APS is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences , under contract no. DE-AC02-06CH11357 .

PY - 2016/4/1

Y1 - 2016/4/1

N2 - The mechanical stability of nanoporous gold (np-Au) at various stages of thermal coarsening is studied via finite element analysis under volumetric compression using np-Au architectures imaged via X-ray nano-tomography. As the np-Au is coarsened thermally over ligament sizes ranging from 185 to 465 nm, the pore volume fraction is determinant for the mechanical stability of the coarsened np-Au, unlike the curvature and surface orientation of the ligaments. The computed Young's modulus and yield strength of the structures are compared with the Gibson-Ashby model. The geometry of the structures determines the locations where stress concentrations occur at the onset of yielding.

AB - The mechanical stability of nanoporous gold (np-Au) at various stages of thermal coarsening is studied via finite element analysis under volumetric compression using np-Au architectures imaged via X-ray nano-tomography. As the np-Au is coarsened thermally over ligament sizes ranging from 185 to 465 nm, the pore volume fraction is determinant for the mechanical stability of the coarsened np-Au, unlike the curvature and surface orientation of the ligaments. The computed Young's modulus and yield strength of the structures are compared with the Gibson-Ashby model. The geometry of the structures determines the locations where stress concentrations occur at the onset of yielding.

KW - Coarsened nanoporous gold

KW - Finite element (FE) analysis

KW - Mechanical stability

KW - Surface characteristics

KW - Volume fraction

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