저자명 S. B. Kim and H. Huh 
Journal Steel Research International 
Volume 86 
Number 11 
Pages 1298-1311 
year 2015 
This paper investigates the tensile properties of sheet metals at intermediate strain rates in relation to the pre-strain history induced by the fabrication process. Sheet metals such as SPCEN(DDQ), EZNCD(DQ), SPCC(CQ), SPRC340R, and SPRC440E were selected with the pre-strain of 2, 5, and 10% by tensile elongation with static tensile test machine, which could be equivalent to the plastic strain induced by a sheet metal forming process. The pre-strained specimens were elongated at the strain rate ranged from 1 to 100s)1. The experimental results reveal that the stress-strain curves are noticeably influenced by the pre-strain at the intermediate strain rate for low yield stress steels such as SPCEN, EZNCD, SPCC, and SPRC340R. It is also noticed that the flow stress does not trace the given stress-strain curve when a sheet metal is pre-strained and the yield stress as well as the ultimate tensile strength increases. This behavior is against the old conjecture that the flow stress follows the stress-strain curve even with the pre-strain.
This paper suggests a new flow stress model for pre-strained sheet metals. The flow stress model consists of two terms: the first term is the ratio of the yield stress of a pre-strained specimen to the equivalent flow stress obtained from the test without pre-strain; the second term is the general empirical flow stress model without the pre-strain effect.
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127 Characterization of flow stress at ultra-high strain rates by proper extrapolation with Taylor impact tests file M. Piao, H. Huh, I. L...  2017.10.11 86
126 Rate-dependent isotropic‒kinematic hardening model in tension‒compression of TRIP and TWIP steel sheets file Geunsu Joo, Hoon Huh  2017.10.11 83
125 Evaluation of the Ductile-to-Brittle Transition Temperature of a silicon steel under various strain rate conditions with a servo-hydraulic high speed testing machine file Junbeom Kwon, Hoon Hu...  2017.06.07 353
124 Tension/compression hardening behaviors of auto-body steel sheets at intermediate strain rates file Geunsu Joo, Hoon Huh,...  2017.06.07 278
123 Evaluation of the effect of the strain rate on the tensile properties of carbon–epoxy composite laminates file J. Kwon, J. Choi, H. ...  2017.06.07 237
122 Material properties of the nugget zone in resistance spot-welded DP980 steel joint at various strain rates file N. Park, M. Park, J.B...  2017.06.07 286
121 Fracture-based Forming Limit Criteria for Anisotropic Materials in Sheet Metal Forming file N. Park, H. Huh, S.J....  2017.06.07 241
120 Process design of combined deep drawing and electromagnetic sharp edge forming of DP980 steel sheet file M.K. Choi, H. Huh, an...  2017.06.07 244
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117 Anisotropy Effect on the Fracture Model of DP980 Sheets Considering the Loading Path file N. PARK, H. HUH, J. B...  2015.06.15 1828
116 Evaluation of dynamic hardening models for BCC, FCC,and HCP metals at a wide range of strain rates Hoon Huh, Kwanghyun A...  2015.02.16 2332
115 Specimen and Grain Size Effects of Al1100 on Strain and Strain Rate Hardening at Various Strain Rates for Al1100 file Junbeom Kwon, Hoon Hu...  2014.08.20 2856
114 Rate-dependent hardening model for polymer-bonded explosives with an HTPB polymer matrix considering a wide range of strain rates file Chunghee Park, Hoon H...  2014.04.11 3830
113 New pseudo-elastic model for polymer-bonded explosive simulants considering the Mullins effect file Kee Sun Yeom Sehwan J...  2013.12.10 4086
112 A Phenomenological energy-based Model for PBX Simulants Considering the Mullins Effect file Kee Sun Yeom Sehwan J...  2013.12.10 3527
111 Strain Hardening Model of Pure Titanium Considering Effects of Deformation Twinning file Kwanghyun Ahn, Hoon H...  2013.09.16 4079
110 Prediction of ductile fracture for advanced high strength steel with a new criterion: Experiments and simulation file Yanshan Lou Hoon Huh  2013.04.08 5881
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