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.
번호 제목 저자명 날짜 조회 수
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 58
124 Tension/compression hardening behaviors of auto-body steel sheets at intermediate strain rates file Geunsu Joo, Hoon Huh,...  2017.06.07 43
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 44
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 43
121 Fracture-based Forming Limit Criteria for Anisotropic Materials in Sheet Metal Forming file N. Park, H. Huh, S.J....  2017.06.07 44
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 42
119 Fracture modelling of DP780 sheets using a hybrid experimental-numerical method and two-dimensional digital image correlation file Keunhwan Pack, Kwangh...  2015.12.01 1476
» Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain file S. B. Kim and H. Huh  2015.11.18 1117
117 Anisotropy Effect on the Fracture Model of DP980 Sheets Considering the Loading Path file N. PARK, H. HUH, J. B...  2015.06.15 1623
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 2107
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 2643
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 3571
113 New pseudo-elastic model for polymer-bonded explosive simulants considering the Mullins effect file Kee Sun Yeom Sehwan J...  2013.12.10 3901
112 A Phenomenological energy-based Model for PBX Simulants Considering the Mullins Effect file Kee Sun Yeom Sehwan J...  2013.12.10 3316
111 Strain Hardening Model of Pure Titanium Considering Effects of Deformation Twinning file Kwanghyun Ahn, Hoon H...  2013.09.16 3868
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 5643
109 Effect of strain rate on plastic anisotropy of advanced high strength steel sheets file Jeehyang Huh Hoon Huh...  2013.04.02 3672
108 Consideration of strength differential effect in sheet metals with symmetric yield functions file Yanshan Lou Hoon Huh ...  2013.03.21 3897
107 Material Behaviors of PBX Simulant with Various Strain Rates [1] file Chunghee Park Sehwan ...  2013.01.08 5862
106 Extension of a shear-controlled ductile fracture model considering the stress triaxiality and the Lode parameter file Yanshan Lou Hoon Huh  2012.12.11 5218