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 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 9489
84 Study on the Retraction of Anterior Teeth for the Lingual Orthodontics with the Three-Dimensional Finite Element Method file J. H. Song H. Huh H. ...  2005.11.29 8843
83 Preform design of the sinter-forging process of arc-shaped powdered magnets file Seung-Ho Kim Choong-H...  2005.11.29 7949
82 Forming Limit Diagram of DP590 considering the Strain Rate [1] [1] file S. B. Kim K. H. Ahn J...  2010.02.23 7183
81 3-D Finite Element Modeling of Fiber Reinforced Rubber Composites using a Rebar Element file S.H. Jeong J.H. Song ...  2007.01.10 6808
80 Effect of Strain Rate on Anisotropic Deformation Behavior of Advanced High Strength Steel Sheets file Jeehyang Huh Hoon Huh...  2011.12.15 6723
79 Microscopic Investigation of the Strain Rate Hardening for Polycrystalline Metals file J. H. Yoon H. Huh C. ...  2008.03.10 6479
78 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 6432
77 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 6267
76 Development ofAl Crash Box for High Crashworthiness Enhancement file J. S. Yoo S. B. Kim M...  2008.12.15 5937
75 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 5918
74 High strain rate tensile test of sheet metals with a new tension split Hopkinson bar file W. J. Kang S. S. Cho ...  2005.11.29 5909
73 Light-weight Design with a Simplified Center-pillar Model for Improved Crashworthiness file Gihyun Bae Hoon Huh J...  2007.01.09 5812
72 Finite Element Inverse Analysis of the Deep Drawing Process Considering Bending History file Jeehyang Huh Jonghuh ...  2007.12.21 5761
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 5721
70 Investigation of springback behavior of DP780 steel sheets after the U-bending process file M.K.Choi H.Huh  2012.11.06 5667
69 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 5616
68 Finite element simulation of a superplastic sheet metal forming process with a pressure cycle control algorithm file Hoon Huh Soo Sik Han ...  2005.11.29 5480
67 Finite Element Analysis of the Hydro-mechanical Punching Process J. H. Yoon H. Huh S. ...  2006.06.12 5297
66 Stress-Based Springback Reduction of an AHSS Front Side Member file J. H. Song S. H. Kim ...  2006.08.30 5288