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On instabilities of growing bi-material interfaces

Reheman, Wureguli ; Ståhle, Per LU and Kao-Walter, Sharon (2019) 3rd International Conference on Structural Integrity, In Procedia Structural Integrity 17. p.850-856
Abstract

This study concerns the evolution of morphological patterns that often arise on the interface of bi-material, so called metal precipitate phase, due to the instability of the interfaces. The instability leads to growth or retraction of small perturbation, which may determine the formation of a variety of morphological patterns initially arising on surfaces of growing precipitates at small length scales. To better understand the cause of different patterns on the bi-material interfaces, an analytical study of the stability of the precipitate-matrix interface is performed. First, a wavy interface perturbation is used to examine the spontaneous variations that occur at the precipitate-matrix interface. Then, the analysis utilises Cerruti?s... (More)

This study concerns the evolution of morphological patterns that often arise on the interface of bi-material, so called metal precipitate phase, due to the instability of the interfaces. The instability leads to growth or retraction of small perturbation, which may determine the formation of a variety of morphological patterns initially arising on surfaces of growing precipitates at small length scales. To better understand the cause of different patterns on the bi-material interfaces, an analytical study of the stability of the precipitate-matrix interface is performed. First, a wavy interface perturbation is used to examine the spontaneous variations that occur at the precipitate-matrix interface. Then, the analysis utilises Cerruti?s solution to compute the perturbed stress field surrounding the interface. It is shown that a virtually flat interface subjected to tension is in general unstable. The amplitude of sinusoidal perturbations decays for short wave lengths and grow for longer wave lengths. Both a critical wave length for which the perturbation amplitude is unaffected and a specific ditto which obtain maximum perturbation growth rate are derived.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bi-material, Instability, Waviness, Growth rate
in
Procedia Structural Integrity
volume
17
pages
7 pages
publisher
Elsevier
conference name
3rd International Conference on Structural Integrity,
conference location
Portugal
conference dates
2019-09-02 - 2019-09-05
external identifiers
  • scopus:85074644091
ISSN
2452-3216
DOI
10.1016/j.prostr.2019.08.113
language
English
LU publication?
yes
id
d25cebfc-571f-4fb3-8baf-5096a5f67087
date added to LUP
2019-08-26 00:03:19
date last changed
2020-01-13 02:31:38
@article{d25cebfc-571f-4fb3-8baf-5096a5f67087,
  abstract     = {<p>This study concerns the evolution of morphological patterns that often arise on the interface of bi-material, so called metal precipitate phase, due to the instability of the interfaces. The instability leads to growth or retraction of small perturbation, which may determine the formation of a variety of morphological patterns initially arising on surfaces of growing precipitates at small length scales. To better understand the cause of different patterns on the bi-material interfaces, an analytical study of the stability of the precipitate-matrix interface is performed. First, a wavy interface perturbation is used to examine the spontaneous variations that occur at the precipitate-matrix interface. Then, the analysis utilises Cerruti?s solution to compute the perturbed stress field surrounding the interface. It is shown that a virtually flat interface subjected to tension is in general unstable. The amplitude of sinusoidal perturbations decays for short wave lengths and grow for longer wave lengths. Both a critical wave length for which the perturbation amplitude is unaffected and a specific ditto which obtain maximum perturbation growth rate are derived.</p>},
  author       = {Reheman, Wureguli and Ståhle, Per and Kao-Walter, Sharon},
  issn         = {2452-3216},
  language     = {eng},
  pages        = {850--856},
  publisher    = {Elsevier},
  series       = {Procedia Structural Integrity},
  title        = {On instabilities of growing bi-material interfaces},
  url          = {https://lup.lub.lu.se/search/ws/files/71874634/ICIS2019_0518.pdf},
  doi          = {10.1016/j.prostr.2019.08.113},
  volume       = {17},
  year         = {2019},
}