저자명 M. Piao, H. Huh, I. Lee, K. Ahn, H. Kim, L. Park 
Journal International Journal of Impact Engineering 
Volume 91 
Pages 142-157 
year 2016 
This paper is to provide a novel systematic procedure to obtain the dynamic flow stress of a material at
ultra-high strain rates ranging from 104 s−1 to 106 s−1 where hardening behaviors are difficult to acquire
from conventional experiments. Uniaxial material tests with AISI 4340 steel are performed at a wide range
of strain rates from 10−3 s−1 to 103 s−1 by using the INSTRON 5583, a high-speed material testing machine
(HSMTM), and a tension split Hopkinson pressure bar (SHPB) testing machine. From the uniaxial tests
above, stress–strain curves are obtained at the strain rates ranging from 10−3 s−1 to 103 s−1. However, stress–
strain curves cannot be obtained at the strain rates higher than 104 s−1 due to the lack in experimental
techniques. In order to characterize hardening behaviors at strain rates ranging from 104 s−1 to 106 s−1,
Taylor impact tests are performed when the speed of a projectile is 200 m/s, 253 m/s, and 305 m/s, which
entail ultra-high strain rates, high temperature, and large plastic deformation. Flow stresses at the ultrahigh
strain rates are characterized through an inverse optimization process by comparing the numerical
simulation results with the experimental results of the sequentially deformed shapes of a projectile during
the Taylor impact test. The thermal softening effect at different strain rates is also considered due to the
elevated temperature caused by large plastic deformation. The flow stresses calibrated by the comparison
are implemented to numerical simulation resulting in a good coincidence with the Taylor impact
tests at different impact velocities. It is noted from the comparison that the yield stress and the comprehensive
hardening curves proposed well describe the deformation behavior up to the strain rate of
106 s−1 beyond the strain rate range for conventional material testing.
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128 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 1375
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126 Rate-dependent isotropic‒kinematic hardening model in tension‒compression of TRIP and TWIP steel sheets file Geunsu Joo, Hoon Huh  2017.10.11 1521
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 2127
124 Tension/compression hardening behaviors of auto-body steel sheets at intermediate strain rates file Geunsu Joo, Hoon Huh,...  2017.06.07 1682
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 1642
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 1700
121 Fracture-based Forming Limit Criteria for Anisotropic Materials in Sheet Metal Forming file N. Park, H. Huh, S.J....  2017.06.07 1694
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 1564
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 3017
118 Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain file S. B. Kim and H. Huh  2015.11.18 3429
117 Anisotropy Effect on the Fracture Model of DP980 Sheets Considering the Loading Path file N. PARK, H. HUH, J. B...  2015.06.15 3266
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 3585
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 4345
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 5445
113 New pseudo-elastic model for polymer-bonded explosive simulants considering the Mullins effect file Kee Sun Yeom Sehwan J...  2013.12.10 5679
112 A Phenomenological energy-based Model for PBX Simulants Considering the Mullins Effect file Kee Sun Yeom Sehwan J...  2013.12.10 5216
111 Strain Hardening Model of Pure Titanium Considering Effects of Deformation Twinning file Kwanghyun Ahn, Hoon H...  2013.09.16 5702
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 7384
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