저자명 Namsu Park, Moonsu Park, Hoon Huh 
Name 2014 KSAE Annual Conference 
Year 2014 
page  

This paper deals with the tensile properties acquisition of the nugget region in spot-welded joint at various strain-rates using micro material testing machine. The driving and load measuring part of Static Micro Material Testing Machine (SMMTM) and High-Speed Micro Material Testing Machine (HSMMTM) were replaced by considering the load requirement. A jig and a gripping device are designed to meet the requirements of the specimen shape and strength. Two kinds of specimens for the tensile tests were obtained each from the center of the welded spot and 1 mm away from the centerline at the spot welded joint of the DP980 by wire electric discharged machining (EDM). The thickness of the specimen was 0.3 mm and the gage length of the specimen was 1 mm. Digital image correction method (DIC) was applied to measure the longitudinal strain. The speckle pattern generation method was also improved for DIC method application. Quasi-static tests were performed with SMMTM at strain-rates of 0.001 s1 and 0.1 s1. Dynamic tests were performed with HSMMTM at strain-rates of 1 s1, 10 s1 and 100 s1. A comparative evaluation was performed between the material properties of the base metal and the nugget region in spot welded joint, based on the obtained stressstrain curves.

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
» 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
240 User Defined Material Model in LS-DYNA for Numerical Simulations of PBX Simulants file Chunghee Park Hoon Hu...  2013.08.30 4629
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 5146