저자명 M. Piao, H. Huh, I. Lee, L. Park 
Journal International Journal of Mechanical Sciences 
Volume 131-132 
Number  
Pages 1117-1129 
year 2017 
This paper is concerned with the characterization of dynamic hardening behaviors of metallic materials at ultra- high strain rates ranging from 10 4 s − 1 to 10 6 s − 1 . As typical metallic materials, three kinds of materials are selected for body centered cubic (BCC), face centered cubic (FCC), and hexagonal close packed (HCP) structures: 4130 steel; OFHC copper; and Ti6Al4V alloy, respectively. In order to investigate the hardening behaviors for the three materials, uniaxial tensile tests are conducted at room temperature of 25 °C and a wide range of strain rates from 10 − 3 s − 1 to 10 3 s − 1 with the Instron 5583, a high speed material testing machine (HSMTM), and a tension split Hopkinson pressure bar (TSHB). To consider the thermal softening effect at different strain rates, tensile tests are additionally performed at an elevated temperature up to 200 °C and strain rates of 10 − 3 s − 1 , 10 − 1 s − 1 , and 10 2 s − 1 . Hardening curves obtained from several experiments are expressed with a constitutive model by multiplying a strain hardening term, a strain rate hardening term, and a thermal softening term to describe material behaviors at large plastic strain, high strain rate, and elevated temperature, respectively. A well fitted constitutive model is utilized to interpolate and extrapolate stress–strain relation from low to ultra-high strain rates. The experimental and extrapolated data are implemented into finite element simulations as the preliminary material properties before calibration. A hybrid experimental-numerical approach is applied to precisely calibrate the extrapolated hardening behaviors at ultra-high strain rates by utilizing the Taylor impact test results. During the Taylor impact tests, images of several sequentially deformed shapes of projectiles are acquired by a high speed camera to compare with numerical simulation results. The stress–strain curves after calibration give notable improvements in the accuracy of numerical estimation of the deforming shapes of projectiles at ultra-high strain rates.
번호 제목 저자명 날짜 조회 수
» Characterization of Hardening Behaviors of 4130 Steel, OFHC Copper, Ti6Al4V Alloy Considering Ultra-High Strain Rates and high Temperatures file M. Piao, H. Huh, I. L...  2017.10.11 993
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 1242
126 Rate-dependent isotropic‒kinematic hardening model in tension‒compression of TRIP and TWIP steel sheets file Geunsu Joo, Hoon Huh  2017.10.11 1171
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 1644
124 Tension/compression hardening behaviors of auto-body steel sheets at intermediate strain rates file Geunsu Joo, Hoon Huh,...  2017.06.07 1300
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 1296
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 1332
121 Fracture-based Forming Limit Criteria for Anisotropic Materials in Sheet Metal Forming file N. Park, H. Huh, S.J....  2017.06.07 1349
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 1128
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 2698
118 Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain file S. B. Kim and H. Huh  2015.11.18 3040
117 Anisotropy Effect on the Fracture Model of DP980 Sheets Considering the Loading Path file N. PARK, H. HUH, J. B...  2015.06.15 2941
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 3245
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 3897
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 4949
113 New pseudo-elastic model for polymer-bonded explosive simulants considering the Mullins effect file Kee Sun Yeom Sehwan J...  2013.12.10 5122
112 A Phenomenological energy-based Model for PBX Simulants Considering the Mullins Effect file Kee Sun Yeom Sehwan J...  2013.12.10 4673
111 Strain Hardening Model of Pure Titanium Considering Effects of Deformation Twinning file Kwanghyun Ahn, Hoon H...  2013.09.16 5302
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 6959
109 Effect of strain rate on plastic anisotropy of advanced high strength steel sheets file Jeehyang Huh Hoon Huh...  2013.04.02 4955