[ Best Paper of This Month ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 33, No. 1, pp.1-10

ISSN: 2508-5107 (Online)

Print publication date 15 Feb 2024

Received 11 Dec 2023 Accepted 26 Dec 2023

DOI: https://doi.org/10.7735/ksmte.2024.33.1.1

이방성 항복함수를 고려한 구조 성형해석에서 마찰계수 결정

김보형^a^{, b} ; 김용배^a^{, b} ; 임성식^b ; 김민기^b^{, *}

Determination of Friction Coefficient in Structural Forming Analysis Considering Anisotropic Yield Function

Bohyeong Kim^a^{, b} ; Yongbae Kim^a^{, b} ; Seongsik Lim^b ; Minki Kim^b^{, *}

aDepartment of Mechanical Engineering, Graduate School, Inha University
bMolding & Metal Forming R&D Department, Korea Institute of Industrial Technology

Correspondence to: ^*Tel.: +82-32-850-0335 E-mail address: mkim@kitech.re.kr (Minki Kim).

Abstract

This paper discusses a method to determine the friction coefficient between molds and a sheet material during metal-forming processes. A deep-drawing process with a hemispherical punch was performed with a 99.9% pure copper ultra-thin sheet material (0.15 mm thick). Tensile tests were conducted along three specimen orientations to determine the material properties for use in finite element (FE) simulations. Different calibration methods for an anisotropic yield function (Hill48) were examined to describe the yield and r-value behaviors. FE simulations with different friction coefficients and constitutive equations were performed to confirm the variation in force vs. displacement response and major/minor strain fields. To determine the friction coefficient, an optimization process was conducted to minimize the differences between the FE and experimental results, which showed good agreement when the optimized friction coefficient was applied. The proposed method would be useful for generating precise FE models for sheet-metal-forming processes.

Keywords:

Friction coefficient, Forming analysis, Anisotropic yield criteria, Finite element method, Ultra-thin copper sheet

Acknowledgments

이 연구는 한국생산기술연구원 내부연구과제(과제번호: KITECHJE-23-0017)의 지원을 받아 수행되었습니다.

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Bohyeong Kim

Graduate Student in the Department of Mechanical Engineering, Inha University and Researcher in Korea Institute of Industrial Technology. His research interest is Metal Forming.

E-mail: kbh960625@kitech.re.kr

Yongbae Kim

Graduate Student in the Department of Mechanical Engineering, Inha University and Researcher in Korea Institute of Industrial Technology. His research interest is Metal Forming.

E-mail: yb_kim@kitech.re.kr

Seongsik Lim

Principal Researcher (Ph. D.) in Korea Institute of Industrial Technology. His research interest is Metal Forming.

E-mail: sslim@kitech.re.kr

Minki Kim

Senior Researcher (Ph. D.) in Korea Institute of Industrial Technology. His research interest is Plasticity, Material Testing & Modeling, Experimental Mechanics.

E-mail: mkim@kitech.re.kr