Indentation based fracture toughness estimation of barium titanate thin film using experiments and simulations

Gulivindala, G. and Ramadurai, Ranjit and Chinthapenta, Viswanath (2022) Indentation based fracture toughness estimation of barium titanate thin film using experiments and simulations. Thin Solid Films, 755. pp. 1-12. ISSN 0040-6090

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Abstract

In this paper, micro indentation studies were carried out on the samples made of partially coated barium titanate thin film deposited over the silicon substrate using pulsed laser deposition technique. Direct and indirect indentation was carried out on the coating to estimate the fracture toughness of barium titanate thin film. Fracture toughness estimation in the direct and indirect indentation methods is through the stress-based and energy-based approaches, respectively. Fracture toughness estimate through direct indentation resulted in a 30% overestimate. Detailed finite element models were developed for both direct and indirect indentation. Cohesive surfaces were incorporated in the numerical models to capture the indentation radial cracks accurately. Unlike the direct method, in the indirect method, indentation was carried out on the substrate at an offset distance from the coating on the partially coated sample. Through experiments and numerical simulations, it was found that offset distance (7–27 μm) in the indirect method has low sensitivity on the estimation of fracture toughness of barium titanate for the load levels of 0.98 to 2.94 N. Thereby making the indirect method easier and more appropriate for fracture toughness estimation. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Ramadurai, Ranjit	http://orcid.org/0000-0003-2991-0027
Chinthapenta, Viswanath	https://orcid.org/0000-0001-9038-6274

Item Type:

Article

Additional Information:

The author Viswanath Chintapenta would like to acknowledge the funding support from the Science and Engineering Research Board (SERB) under the ECR grant ECR/2016/002063 and Dassault systems foundation, India (La fondation) under the grant number IN-2019-001. The author Gulivindala Gopi was partially supported by both the pro- jects. One of the authors, Ranjith Ramadurai, would like to acknowledge the Department of Science and Technology, India (Grant No: DST/ SERB/EMR/2017/003159/MMM) for financial assistance in carrying out the fabrication of thin films. The authors would like to thank Dhiman Banik and Yasam Palguna for their help during the experiments.

Uncontrolled Keywords:

Barium titanate thin film, Cohesive zone modeling, Fracture toughness, Pulsed laser deposition, Vickers indentation

Subjects:

Physics > Mechanical and aerospace
Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering
Department of Mechanical & Aerospace Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

20 Jun 2022 10:39

Last Modified:

20 Jun 2022 12:06