Examination of Prestressed Coating/substrate Systems Using Spherical Indentation - Determination of Film Prestress, Film Modulus and Substrate Modulus.

[+] Author and Article Information
James A. Mills

122nd ST. Broadway New York, NY 10027 jam2001@columbia.edu

Hang Xiao

520 West 122nd Street Apt 2 New York, NY 10027 xiaohang007@gmail.com

Xi Chen

116th St & Broadway Broadway New York, NY 10027 xichen863@hotmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received June 22, 2018; final manuscript received April 23, 2019; published online xx xx, xxxx. Assoc. Editor: Anastasia Muliana.

ASME doi:10.1115/1.4043628 History: Received June 22, 2018; Accepted April 24, 2019


There have been many studies performed with respect to the indentation of thin films affixed to a corresponding substrate base. These studies have primarily focused on determining the mechanical properties of the film. It is the goal of this paper to further understand the role that the film plays and how a potential pre-stressing of this film has on both the film and substrate base. It is equally important to be able to understand the material properties of the substrate since during manufacturing or long term use, the substrate properties may change. In this study, we establish through spherical indentation a framework to characterize the material properties of both the substrate and film as well as a method to determine the prestress of the film. It is proposed that through an initial forward analysis a set of relationships are developed that along with then performing a single spherical indentation test, measuring the indentation force at two prescribed depths, material properties of both the film and substrate can be determined. The problem is further enhanced by also developing the capability of determining any equi-biaxial stress state that may exist in the film. A generalized error sensitivity analysis of this formulation is also performed systematically. This study will enhance the present knowledge of a typical pre-stressed film/substrate system as is commonly used in many of today's engineering and technical applications.

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