Modeling of elastoplastic behavior of freestanding squarenthin films under bulge testing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00542223" target="_blank" >RIV/68081723:_____/21:00542223 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s00707-021-02978-7" target="_blank" >https://link.springer.com/article/10.1007/s00707-021-02978-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00707-021-02978-7" target="_blank" >10.1007/s00707-021-02978-7</a>

Result language

angličtina

Original language name

Modeling of elastoplastic behavior of freestanding squarenthin films under bulge testing

Original language description

Bulge testing is an experimental technique applied to the characterization of thin films, with which the mechanical properties are obtained employing numerical and analytical approaches. For rectangular and circular thin films, classical methods have been well adopted to calculate the stresses and strains at the central point without the dependency of its properties. It is due to that the equilibrium conditions are dependent on the curvatures generated at the maximum deflection point. Therefore, the kinematics of the bulged surface can be represented by a spherical cap and cylindrical shapes in these films. For square thin films, the deflected surface presents a complex displacement field that implies the development of analytical models for the estimation of these. In this sense, equations to represent the equibiaxial stress state (central point) for freestanding square thin films are developed and applied in this study. The curvatures are determined using a reviewed nonlinear deflection field. Virtual experiments were driven by applying finite element analysis to validate the stress and strain models through parametric analysis.In order to impose the residual stress in thin films, two approaches of modeling for the simulations are described. In order to validate the applicability of the proposed equations, different cases were presented for the linear elastic analysis, and two examples were developed to characterize elastoplastic behavior (bilinear and nonlinear) from load–deflection curves. The obtained results show that the developed models for square thin films are in good agreement with the finite element simulations since these predicted the stress and strain states with good accuracy.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Acta Mechanica

ISSN

0001-5970

e-ISSN

1619-6937

Volume of the periodical

232

Issue of the periodical within the volume

7

Country of publishing house

AT - AUSTRIA

Number of pages

17

Pages from-to

2715-2731

UT code for WoS article

000645192400003

EID of the result in the Scopus database

2-s2.0-85105393098