Author
Jinwoo Lee
Bio: Jinwoo Lee is an academic researcher from Pohang University of Science and Technology. The author has contributed to research in topics: Hardening (metallurgy) & Formability. The author has an hindex of 19, co-authored 67 publications receiving 1058 citations.
Papers
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TL;DR: A finite element implementation of the recently proposed constitutive model (Homogeneous yield function-based anisotropic hardening model or HAH) that describes the plastic behavior of materials subjected to multiple strain path changes was developed.
121 citations
TL;DR: In this paper, a constitutive model based on anisotropic hardening was used in the finite element (FE) simulations of springback and its performance was compared with that of conventional hardening laws.
95 citations
TL;DR: In this article, the authors used high-precision modulus measurements using mechanical testing, resonant frequency damping analysis, and ultrasonic pulse-echo techniques to evaluate the consistency of the behavior of different grades of steel.
88 citations
TL;DR: In this article, a quasi-plastic-elastic strain (QPE) model is proposed to capture the complex plastic flow behavior of sheet metals such as the Bauschinger effect, transient behavior, workhardening stagnation and permanent softening.
82 citations
TL;DR: In this article, the effects of the stress state and temperature on the martensitic phase transformation behavior in a TRIP-assisted steel (TRIP780) were investigated using multi-axial experimental techniques.
79 citations
Cited by
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TL;DR: Wagoner et al. as mentioned in this paper presented a review of recent advances in the field of springback, the elastically driven change of shape of a metal sheet during unloading and following forming.
267 citations
31 Dec 2013
TL;DR: In this paper, a macroscopic ductile fracture criterion is proposed based on micro-mechanism analysis of nucleation, growth and shear coalescence of voids from experimental observation of fracture surfaces.
Abstract: A macroscopic ductile fracture criterion is proposed based on micro-mechanism analysis of nucleation, growth and shear coalescence of voids from experimental observation of fracture surfaces. The proposed ductile fracture model endows a changeable cut-off value for the stress triaxiality to represent effect of micro-structures, the Lode parameter, temperature, and strain rate on ductility of metals. The proposed model is used to construct fracture loci of AA 2024-T351. The constructed fracture loci are compared with experimental data covering wide stress triaxiality ranging between −0.5 and 1.0. The comparison suggests that the proposed model can provide a satisfactory prediction of ductile fracture for metals from compressive upsetting tests to plane strain tension with slanted fracture surfaces. Moreover, it is expected that the proposed model reasonably describes ductile fracture behavior in high velocity perforation simulation since a reasonable cut-off value for the stress triaxiality is coupled with the proposed ductile fracture criterion.
195 citations
TL;DR: In this paper, the homogeneous anisotropic hardening (HAH) approach was extended to crossloading cases with latent hardening effects, which is based on the physical understanding of dislocation structure evolution during strain path changes.
164 citations
TL;DR: In this paper, experimental and numerical analyses of Forming Limit Diagram (FLD) and FLSD for two Advanced High Strength Steel (AHSS) sheets grade DP780 and TRIP780 were performed.
149 citations
TL;DR: In this paper, the formulation of the so-called homogeneous anisotropic hardening (HAH) model, originally proposed in Barlat et al. (2011), is refined.
138 citations