Modeling of yield point elongation based on rotating yield function = 회전 항복함수 기반 항복점 신장 모델링

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A new quadratic planar yield function is rotated in the stress space by equivalent plastic strain has proposed. The proposed function can decrease flow stress in a uniaxial tension test for a certain direction even if the hardening monotonically increases, and is able to reproduce Lüder's band propagation and yield point elongation. The proposed function converges to Hill’s 1948 planar yield function after equivalent strain reaches a specified value. To verify the function, the DDQ steel which shows yield point elongation has been selected to compare the stress-strain curves of experimental data and finite element simulation. The proposed function reproduced Lüder's band propagation. The upper and lower yield strength of the finite element simulation fit well with the experimental data, and also the true stress-strain curve after the stress plateau followed hardening curve. It can be concluded that the proposed yield function well predicts the stress-strain curve with yield point elongation in a uniaxial tension test.
Advisors
Yoon, Jeong Whanresearcher윤정환researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2019.2,[v, 65 p. :]

Keywords

Yield function▼aflow rule▼alüder's band▼ayield point elongation▼akinematic hardening; 항복함수▼a유동 법칙▼a루더스 밴드▼a항복점 신장▼a이동 경화법칙

URI
http://hdl.handle.net/10203/265908
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843032&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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