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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Formability and Spring-back Issues in Ultra-high Strength Steels and High Strength Aluminum Alloys
Presentation Title Anisotropic Fracture of Mild and Advanced High Strength Steel in Non-linear Strain Paths
Author(s) Cliff Butcher, Armin Abedini, K. Cheong, Farinaz Khameneh, Thomas Stoughton, E. McCarty
On-Site Speaker (Planned) Cliff Butcher
Abstract Scope Ideal proportional loading conditions with linear strain paths are rarely encountered in automotive forming and fracture applications. However, the majority of forming and fracture models such as forming limit curves and phenomenological fracture surfaces have been developed under the assumption of linear strain paths. In the present study, the influence of nonlinear strain paths on the anisotropic fracture behavior of a DDQ (DC04) mild steel and DP1180 advanced high strength steel were experimentally investigated. The two steels were subjected to bilinear strain histories with the first path being proportional in-plane stretching in uniaxial, plane strain and equal-biaxial conditions. Fracture coupons were then extracted and tested for the second loading stage from shear to biaxial tension. For the DP1180, the non-linear strain paths focused upon loading in rolling and transverse while three directions were considered for the mild steel. Phenomenological damage accumulation models extended for fracture anisotropy were then evaluated for both steels across the range of loading conditions. Recommendations and best-practices are discussed to minimize the testing required to characterize the constitutive and fracture behavior for crash applications.
Proceedings Inclusion? Planned:


A Investigation of the Bendability of Friction-stir Processed Aluminum 7075 & 6111 Alloys and Its Effect on Formability
Anisotropic Fracture of Mild and Advanced High Strength Steel in Non-linear Strain Paths
Dimensional Control in Flexible Fabrication of Sheet Metals for Automotive Applications
Hot Stamping of Third Generation Advanced High Strength Steels
Hybrid Bead Development and Validation; Auto Steel Partnership
Influence of Yoshida-Uemori Model on Springback Prediction
Microstructure and Mechanical Properties According to Heat Treatment of High Tensile Strength Steel Alloy
On Local Formability of Multi-phase Ultra-high-strength Steels
Retrogression Forming and Reaging for Forming and Joining AA7075-T6 Sheet
Roller Bending/Unbending Process for Improving the Local Mechanical Properties of Aluminum Sheets
The “Next Era in Stamping Technology” (NEST), The Fundamentals of a Hybrid Stamping Technology

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