저자명 N. Park, M. Park, and H. Huh 
Name AEPA2016 
Place Japan 
Year 2016 

This paper deals with a method for evaluation of tensile properties of a nugget zone in a spot-welded joint at various strain rates using a micro material testing machine. In order to properly consider the load requirement, a driving and a load measuring part of a Static Micro Material Testing Machine (SMMTM) and a High-Speed Micro Material Testing Machine (HSMMTM) were replaced respectively. 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 Correlation method (DIC) was applied to measure the longitudinal strain. A method for speckle pattern generation was also improved for application of the DIC method to the micro-specimen. Quasi-static tests were performed with SMMTM at strain rates of 0.001 s−1 and 0.1 s−1 and dynamic tests were performed with HSMMTM at strain rates of 1 s−1, 10 s−1 and 100 s−1, respectively. 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 stress−strain curves.

번호 제목 저자명 날짜 조회 수
176 Effect of Pre-strain on Tensile Properties of Al5052-H32 under an Electropulsing Condition M. Kim, J. Song, H. Huh  2017.10.11 1344
175 Prediction of fracture initiation in square cup drawing of DP980 using an anisotropic ductile fracture criterion file N. Park, H. Huh, J. Yoon  2017.10.11 1455
» A Method for Evaluation of Tensile Properties of a Nugget Zone in a Spot-Welded Joint Considering the Strain Rate N. Park, M. Park, and...  2017.06.07 1482
173 Tensile Properties of Stitched Fabric Composite Manufactured by RTM Considering Various Strain Rates and Stacking Sequences file Jesung Yoo, Hoon Huh,...  2017.06.07 1484
172 Prediction of the onset of fracture of DP980 steel 1.2t under typical loading conditions based on associated and non-associated flow rules file N. Park and H. Huh  2017.06.07 1494
171 Rate-dependent Material Parameters of the Combined Isotropic/kinematic Hardening Model for the TRIP980 steel sheet file Geunsu Joo, Hoon Huh  2017.06.07 1495
170 Evaluation of tensile properties of heat-treated AISI4340 steel at various strain rates file N. Park, S.J. Lim, an...  2017.06.07 1496
169 Tensile properties of a tempered glass plate at the quasi-static state M. Kim, H. Huh, E. Ju...  2017.06.07 1522
168 Tensile Properties of Auto-body Plastic with Various Strain Rates for FEM by Using The DIC Method and The Force Equilibrium Grid Method file Jesung Yoo, Hoon Huh,...  2017.06.07 1558
167 Modeling of rate-dependent hardening behaviors of the TWIP980 steel sheet in tension and compression file Geunsu Joo, Hoon Huh  2017.10.11 1604
166 ASYMMETRIC MECHANICAL PROPERTIES OF TRIP980 AND TWIP980 STEEL SHEETS AT VARIOUS STRAIN RATES file Geunsu Joo, Hoon Huh  2017.06.07 1611
165 Prediction of the Ductile-to-Brittle Transition Temperature of a silicon steel under various strain rate conditions file Junbeom Kwon, Hoon Hu...  2017.06.07 1617
164 Investigation of the hardening behavior of sheet metals at intermediate strain rates considering the pre-strain M. Kim and H. Huh  2017.06.07 1631
163 RATE-DEPENDENT HARDENING BEHAVIORS OF ULTRA-HIGH STRENGTH STEEL SHEETS UNDER IN-PLANE TENSION/COMPRESSION file Hoon Huh, Geunsu Joo  2017.06.07 1710
162 AN IMPROVED DEVICE FOR THE TENSION/COMPRESSION TEST AT INTERMEDIATE STRAIN RATES file Geunsu Joo, Hoon Huh  2017.06.07 1749
161 Characterization of Hardening Behavior at Ultra-High Strain Rate, Large Strain, and High Temperature file MingJun Piao, Hoon Hu...  2017.10.11 1815
160 Validation of the Thermal Softening Effect at a Wide Range of Strain Rates by Using the Taylor Impact Test file MingJun Piao, Hoon Hu...  2017.10.11 1843
159 An improved technique for reducing the load ringing phenomenon in tensile tests at high strain rates file J.B. Kwon, H.Huh, C.N...  2015.08.08 2749
158 Efficient coil design by electromagnetic topology optimization for electromagnetic sharp edge forming of DP980 steel sheet file M. K. Choi, H. Huh, M...  2016.05.25 2838
157 Validation of Dynamic Hardening Models With Taylor Impact Tests at High Strain Rates file MingJun Piao, Chunghe...  2015.06.15 3069