An improved test for shear fracture. (15th October 2016)

• Record Type: Journal Article
• Authors: Li, D.Y.; Chen, Z.; Sun, L.; Lee, J.W.; Wagoner, R.H.
• Is Part Of: International journal of solids and structures. Volume 97/98(2016)
• Page Start: 29
• Page End: 42
• Publication Date: 2016-10-15
• Subjects: Wide draw-bend -- Advanced high strength steel (AHSS) -- Plane strain (PS) -- Shear fracture -- Thermal-mechanical finite element model; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2016.08.002
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: Shear fracture can occur when sheet metal is drawn over a tight die radius during forming. Draw-bend fracture (DBF) tests replicate many aspects of the applied forming situation, but not the high strain rates and plane-strain states typical of industrial conditions. In order to improve on the DBF test, a new high-speed, wide, draw-bend fracture (WDBF) test was configured, implemented, and applied to 5 advanced high strength steels (AHSS) with known constitutive behavior and DBF ductility: DP780, DP590, DP980, TRIP780 and TWIP. Finite element (FE) simulations of the WDBF tests were compared with experiments. Similar comparative simulations were carried out for true plane-strain conditions (unattained experimentally) and for standard DBF tests. The WDBF test was found to be better at reproducing industrial conditions than the DBF test over a much wider range of conditions, but even the new configuration remains substantially different from a hypothetical true plane-strain test. The simulations reveal quantitative assessments of the roles of friction, thermo-mechanical deformation and yield surface choice on shear fracture.