저자명 Chunghee Park Hoon Huh and Jungsu Park 
Name Proceedings of KIMST Annual Conference 
Year 2013 
page 1322-1323 

This paper is concerned with numerical simulations of PBX (polymer-bonded explosives) simulants at various strain rate conditions. Uniaxial compressive tests of two kinds of PBX simulants were conducted at a wide range of strain rates to investigate the effect of the strain rate on the strain hardening behavior of PBX simulants. Dynamic material testing machine (Instron 8801) was utilized for uniaxial compressive tests from quasi-static states to low strain rates ranging from 0.0001 s-1 to 1 s-1 and developed high speed material testing machine (HSMTM) was used for uniaxial compressive tests at intermediate strain rates ranging from 10 s-1 to 100 s-1. Split Hopkinson pressure bar (SHPB) was utilized for uniaxial compressive tests at high strain rates ranging from 1,250 s-1 to 3,870 s-1. The effect of the strain rate on the strain hardening behavior during uniaxial compressive deformation is quantitatively investigated from the experimental data at various strain rates. A new rate-dependent hardening model was proposed to model the effect of the strain rate on the strain hardening behavior of PBX simulants. The model is capable of representing the complicated strain rate effects on the strain hardening behavior for rate-sensitive materials with a second-order strain rate sensitivity function. The proposed model was implemented in LS-DYNA with user defined material model (UMAT). Finite element analyses of uniaxial compressive tests at various strain rates were conducted to validate the proposed model. The comparisons of FEA results with the experimental data show that the proposed model was successfully able to describe the significant effect of the strain rate on the strain hardening behavior of PBX simulants.

번호 제목 저자명 날짜 조회 수
256 Evaluation of Dynamic Hardening Models With Taylor Impact Tests at Ultra High Strain Rates For 4340 Steel file M. J. Piao, I. Lee, H...  2017.10.11 93
255 Tension/compression Test of Giga-grade Steel Sheets Considering Intermediate Strain Rates file Geunsu Joo, Hoon Huh  2017.06.07 181
254 Evaluation of Measurement Uncertainty of Dynamic Tensile Properties M.K. Choi, H. Choe, H...  2017.06.07 168
253 Evaluation of Tensile Properties of Auto-body Plastics Using DIC Method and Force Equilibrium Grid Method file Jesung Yoo, Park Nams...  2017.06.07 174
252 Modeling of a Ductile Fracture Model Considering the Anisotropy of Sheet Metal file N. Park and H. Huh  2015.12.28 2059
251 Evaluation of Dynamic Hardening Models With Taylor Impact Tests at Ultra High Strain Rates For 4340 Steel file M.J. Piao, I. Lee, H....  2015.06.15 2228
250 Prediction of Fracture Strains for DP980 Steel Sheets at a Wide Range of Loading Paths file N. Park, H. Huh  2014.10.29 2381
249 Evaluation of Structural Design for Improvement of the Roof Strength of a Three-Wheel Vehicle file Jesung Yoo, Junbeom K...  2014.07.10 2708
248 Tension/compression Hardening Behavior of Auto-body Steel Sheets at Intermediate Strain Rates file Geunsu Joo, Minkuk Ch...  2014.07.10 2687
247 Prediction of Deformation Behavior of PBX Simulant in a Warhead during High Speed Crash file Namsu Park, Chunghee ...  2014.07.01 2939
246 Tensile Properties of Nugget Region in Spot-welded Joints at Various Strain-Rates file Namsu Park, Moonsu Pa...  2014.07.01 2943
245 Measurement Uncertainty Evaluation of High Speed Tensile Properties of AZ 31 Sheet Considering Correlation file M. K. Choi, H. Huh, C...  2014.06.24 2654
244 Evaluation and Prediction of Tensile Properties of CFRP file Junbeom Kwon, Jaeyoun...  2013.12.27 3241
243 Experimental Investigation of the Effect of the Forming Speed on the Springback Behavior of DP780 Steel Sheets file M. K. Choi, H. Huh  2013.12.27 2727
242 Evaluation of Standard Uncertainty in Modified Measurement of Dynamic Tensile Properties of Auto-body Steel Sheets file Min Kuk Choi, Sehwan ...  2013.12.27 2957
241 The stress softening-effect of polymer-bonded explosive simulant for shear deformation file Kee Sun Yeom Hoon Huh...  2013.12.10 2840
» User Defined Material Model in LS-DYNA for Numerical Simulations of PBX Simulants file Chunghee Park Hoon Hu...  2013.08.30 4630
239 Fracture strain evaluation of the metallic materials at intermediate strain rates file Sung Jun Lim and Hoon...  2013.08.30 3068
238 Anisotropy Effect on the Fracture Strain of DP980 Sheets [1] file Namsu Park, Sung Jun ...  2013.08.29 3122
237 Evaluation of Ductile Fracture Criteria in Full Stress States file Yanshan Lou, Mingjun...  2013.02.01 5147