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Finite element modeling and simulations on indentation and scratch tests on thin films: effects of prestress

Published online by Cambridge University Press:  09 May 2019

Biao Feng  and
Zhen Liu
Biao Feng
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Zhen Liu*
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
*
Address all correspondence to Zhen Liu at hit_lz@lanl.gov
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Abstract

Indentation and scratch models are proposed to numerically investigate effects of compressive prestress on film's mechanical responses. In indentation, normal stress distributions are strongly dependent on film thickness; the applied force and the maximum normal stresses with a prestress are much larger than without prestress. For various film thicknesses the change in the normal force in scratch between the non-prestressed and prestressed films is 4%–23%. The scratch friction coefficient is larger with prestress than without prestress. With biaxial or uniaxial prestress the material becomes more difficult to deform or to slide at the contact surface compared with cases without prestress.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 2 , June 2019 , pp. 756 - 763
Copyright
Copyright © Materials Research Society 2019 

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