Ji Hyun Sung

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: In this article, a new displacement-controlled draw-bend test was developed, carried out, and simulated using a coupled thermo-mechanical finite element model, incorporating 3D solid elements and a novel constitutive law taking into account the effects of strain, strain rate and temperature on flow stress.

TL;DR: In this article, a draw-bend springback test was performed on three dual phase (DP) steels (DP 600, DP 800, and DP 980), a transformation-induced plasticity steel (TRIP) steel (TIP 780), and three traditional steels, including DQSK, AKDQ, and HSLA.

TL;DR: In this paper, a 1-D constitutive equation relating flow stress to strain, strain rate, and temperature was developed based on tensile tests, which predicted the types of failures accurately, without introducing damage mechanics.

TL;DR: In this article, the authors measured and creep-simulated the time-dependent behavior of four advanced high strength steel (DP600, DP800, DP980 and TRIP780) for various test conditions.