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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 31 , No. 1

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Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 31, No. 1, pp. 1-11
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Feb 2022
Received 17 Dec 2021 Revised 04 Jan 2022 Accepted 06 Jan 2022
DOI: https://doi.org/10.7735/ksmte.2022.31.1.1
DFF와 압흔 경계 구분을 이용한 수직 압흔 변위 측정 방법에 관한 연구
이승원^a ; 유경현^a ; 이철수^b^{, *}


A Study on the Measurement Method of Vertical Imprint Displacement Using a Depth from Focus (DFF) Method and the Separation of Imprint Boundaries
Seung Won Lee^a ; Kyung Hyun Yoo^a ; Cheol Soo Lee^b^{, *}
aDepartment of Mechanical Engineering, Graduate School, Sogang University
bDepartment of Mechanical Engineering, Sogang University
Correspondence to : ^*Tel.: +82-2-705-8646 E-mail address: cscam@sogang.ac.kr (Cheol Soo Lee).

Abstract

Measuring imprint is important to evaluate material’s mechanical property through indentation test. In this study, we propose a measurement method for vertical imprint displacement after an indentation test. we divided the imprint into two regions, a file-up region with small displacement and a sloped region with large displacement. We estimated the focus value with different sized Laplacian operators for the separated regions. Then, we combined these results and estimated the depth map using the depth from focus (DFF) method. We constructed the median line of the depth map from the center of the imprint and compared results to contact profiler data. Comparing the results for the three materials (Al 1050 - T6, Al 5052 - H32, Al 6061 - T651), the maximum error rate was found to be 5%. In future studies, this result can be used for the estimation of material properties using FEM data.


Keywords: Indentation test, Depth from focus (DFF), Focus value, Imprint, Micro scale

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Seung Won Lee

Master course in the Department of Mechanical Engineering, Sogang University. His research interest is Robotics.

E-mail: seungwon426@naver.com

Kyung Hyun Yoo

Master course in the Department of Mechanical Engineering, Sogang University. His research interest is mechanical design.

E-mail: bggh3@naver.com

Cheol Soo Lee

Professor in the Department of Mechanical Engineering, Sogang University. His research interest is Machine, Design of Machine Tools.

E-mail: cscam@sogang.ac.kr