A Comparative Investigation on the Characterization of the Fracture Strain in Uniaxial Tension for a DP1180 Steel Sheet
2022-01-0268
03/29/2022
- Event
- Content
- Advanced High Strength Steels (AHSS) such as DP1180 have been widely adopted throughout the automotive industry for vehicle light-weighting and improved crash performance. Since the AHSS have relatively low ductility, accurate forming and fracture characterization of the materials is crucial. In the present study, a comprehensive experimental investigation was performed to characterize the uniaxial tensile fracture behavior of a dual-phase steel, DP1180 sheet, using a hole tension, conical hole expansion and standard dogbone uniaxial tensile tests. Full-field stereoscopic digital image correlation (DIC) strain measurement was employed along with a post-mortem strain correction technique based upon the thickness at fracture and angle of localization. It was observed that the DIC cannot resolve fracture strains accurately, specifically in the presence of significant localization prior to fracture, leading to a pronounced under-prediction of the fracture strain. Finite-element models of the tests were created and analyzed to better understand the mechanics of the so-called uniaxial tensile tests in terms of how closely they can sustain a uniaxial loading during deformation. A procedure to experimentally estimate the fracture strain in uniaxial tension is proposed to avoid the need for inverse finite-element analysis.
- Citation
- Khameneh, F., "A Comparative Investigation on the Characterization of the Fracture Strain in Uniaxial Tension for a DP1180 Steel Sheet ," SAE Technical Paper 2022-01-0268, 2022, .