Ji Hoon Kim

TL;DR: An empirical plasticity constitutive form describing the flow stress as a function of strain, strain-rate, and temperature has been developed, fit to data for three dual-phase (DP) steels, and compared with independent experiments outside of the fit domain this paper.

TL;DR: The TWINLAW model as discussed by the authors is based on three phenomenological deformation modes for Mg AZ31B: S (slip), T (twinning), and U (untwinning), which correspond to three testing regimes: initial in-plane tension (from the annealed state), initial inplane compression, and inplane tension following compression, respectively.

TL;DR: In this article, a simulation of the friction stir butt welding (FSBW) process was performed for AA5083-H18 sheets, utilizing a commercial finite volume method (FVM) code, STAR-CCM+, which is based on the Eulerian formulation.

TL;DR: In this paper, the mechanical properties of the metal active gas weld zone and heat affected zone were characterized utilizing the continuous indentation method together with its finite element (FEM) analysis, and the failure criterion of the base material and weld zones particularly for the failure evaluation in the uni-axial tension test, Hill's bifurcation theory and the M-K theory were applied to calculate the forming limit diagrams considering all measured properties including strain-rate sensitivity.

TL;DR: In this article, an elasto-plastic constitutive model with the plastic strain rate potential was developed for finite element analysis, where isotropic-kinematic hardening was incorporated under the plane stress condition for anisotropic sheet cubic metal forming analysis.