저자명 N. Park, H. Huh 
Journal Transactions of Materials Processing 
Volume 24 
Number
page 176-180 
Year 2015 

The current study is concerned with the prediction of fracture strains for DP980 steel sheets over a wide range of loading paths. The use of DP980 steel is increasing significantly in automotive industries for enhanced safety and higher fuel efficiency. The material behavior of advanced high-strength steels (AHSSs) sheets sometimes show unpredictable and sudden fracture during sheet metal forming. A modified Lou–Huh ductile fracture criterion is utilized to predict the formability of AHSSs because the conventional forming limit diagram (FLD) constructed based on necking is unable to evaluate the formability of AHSSs sheets. Fracture loci were extracted from three dimensional fracture envelopes by assuming the plane-stress condition to evaluate equivalent plastic strains at the onset of fracture for a wide range of loading paths. Three different types of specimens -- pure shear, dog-bone and plane strain grooved -- were utilized for tensile testing to calibrate the fracture model of DP980 steel sheets. Fracture strains of each loading path were evaluated such that there shows little deviation between fracture strains predicted from the fracture model and the experimental measurements. From the comparison, it is clearly shown that the three dimensional fracture envelopes can accurately predict the onset of the fracture of DP980 steel sheets for complicated loading conditions from compressive loading to shear loading and to equi-biaxial tensile loading.

번호 제목 저자명 날짜 조회 수
85 Numerical Simulation of a Gun-launched Projectile Considering Rifled-gun Tube file G. Joo, H. Huh, Y. H....  2017.08.11 96
84 Modeling of a Ductile Fracture Criterion for Sheet Metal Considering Anisotropy file N. Park and H. Huh  2017.06.07 114
» Prediction of Fracture Strains for DP980 Steel Sheets for a Wide Range of Loading Paths file N. Park, H. Huh  2015.06.15 1073
82 Investigation of springback behavior of DP780 steel sheets after the U-bending process file M.K.Choi H.Huh  2012.11.06 4605
81 Effect of Strain Rate on Anisotropic Deformation Behavior of Advanced High Strength Steel Sheets file Jeehyang Huh Hoon Huh...  2011.12.15 6025
80 Analytical study of the effect of material properties on the formability of sheet metals based on the M-K model file Yanshan Lou Seokbong ...  2010.11.12 5534
79 Quasi-static and Dynamic Deformation Behavior of STS304- and Ta-fiber-reinforced Zr-based Amorphous Matrix Composites Fabricated by Liquid Pressing Precess file Yongjin Kim Sang Yong...  2010.07.29 8494
78 Construction of Modified Yield Loci with Respect to the Strain Rates using Hill48 Quadratic Yield Function file C. S. Lee G. H. Bae S...  2010.03.08 5111
77 Forming Limit Diagram of DP590 considering the Strain Rate [1] [1] file S. B. Kim K. H. Ahn J...  2010.02.23 5669
76 Development ofAl Crash Box for High Crashworthiness Enhancement file J. S. Yoo S. B. Kim M...  2008.12.15 5078
75 Microscopic Investigation of the Strain Rate Hardening for Polycrystalline Metals file J. H. Yoon H. Huh C. ...  2008.03.10 5613
74 Finite Element Inverse Analysis of the Deep Drawing Process Considering Bending History file Jeehyang Huh Jonghuh ...  2007.12.21 4986
73 3-D Finite Element Modeling of Fiber Reinforced Rubber Composites using a Rebar Element file S.H. Jeong J.H. Song ...  2007.01.10 5947
72 Dynamic Constitutive Equations of Auto-body Steel Sheets with the Variation of Temperature (Ⅱ) –Flow Stress Constitutive Equation– file H. J. Lee J. H. Song ...  2007.01.09 4614
71 Dynamic Constitutive Equations of Auto-body Steel Sheets with the Variation of Temperature (I)-Dynamic Material Characteristics with the Variation of Temperature file H. J. Lee J. H. Song ...  2007.01.09 4850
70 Light-weight Design with a Simplified Center-pillar Model for Improved Crashworthiness file Gihyun Bae Hoon Huh J...  2007.01.09 5015
69 Dynamic Tensile Characteristics of the High Strength Steel Sheet for an Auto-body file S. B. Kim H. Huh C. L...  2007.01.09 4332
68 Crash Analysis of the ULSAB-AVC Model with Considering Forming Effects file H. Huh J. H. Yoon Y. ...  2006.12.11 4301
67 Stress-Based Springback Reduction of an AHSS Front Side Member file J. H. Song S. H. Kim ...  2006.08.30 4480
66 Dynamic Material Property of the Sinter-Forged Cu-Cr Alloys with the Variation of Chrome Content file J.H. Song H. Huh  2006.08.02 5581