| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
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| Symposium
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Formability and Spring-back Issues in Ultra-high Strength Steels and High Strength Aluminum Alloys
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| 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: |