Failure with Strain Localization of Aluminum Alloy 7075 Sheets at Elevated Temperature and its Application to Two-Step Hybrid Forming

Jong‑Hwa Hong; Hyunki Kim; Wonjae Kim; Yong‑Nam Kwon; Daeyong Kim

doi:10.1007/s12540-020-00949-6

추천

검색

자료유형: 학술저널

저자정보: Jong‑Hwa Hong (Seoul National University) Hyunki Kim (Hyundai Motor Company & Kia Motors Corporation) Wonjae Kim (Samsung Electronics) Yong‑Nam Kwon (Korea Institute of Materials Science) Daeyong Kim (Korea Institute of Materials Science)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.4

발행연도: 2022.4

수록면: 871 - 886 (16page)

DOI: 10.1007/s12540-020-00949-6

이용수

📌

연구주제

📖

연구배경

🔬

연구방법

🏆

연구결과

초록· 키워드

오류제보하기

In this work, the onset of failure induced by severe strain at elevated temperature was numerically estimated with crossformedempirical hardening law describing material softening. The hardening law can replicate the rate-sensitive behaviorof aluminum alloy 7075 sheets (thickness of 2.0 mm) with initial hardening and progressive material deterioration causedby dynamic recrystallization, dynamic recovery, and micro-void development. The characterized material was applied to thetwo-step hybrid forming process consisting of a drawing at 400 °C followed by a pneumatic forming at 470 °C to produce ashock absorber housing with an extremely complex shape. The user-defined subroutine codes, VUMAT (ABAQUS/Explicit)and UMAT (ABAQUS/Standard), were sequentially utilized for the drawing and the pneumatic forming, respectively. Theidentified hardening parameters based on uniaxial tensile tests were validated by simulating the two-step hybrid formingprocess and compared with the conventional Voce type law (converging function) and the combined Swift-Voce type law(ever-increasing function) since they play a key role in accurately predicting the onset of failure induced by severe strainlocalization. Finally, simulation results are reasonably well matched with experiments in terms of the moment of failureoccurrence, failure location, final blank shape, and thickness distribution.

#Aluminum alloy 7075 sheets · Failure with strain localization · Material characterization · Hardening deterioration · Yield function shrinkage · Two-step hybrid forming

참고문헌 (0)

참고문헌 신청

참고문헌이 DBpia에서 서비스 중이라면, [참고문헌 신청]을 통해 등록해보세요

함께 읽어보면 좋을 논문

논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!