Towards Single-Test Anisotropy Calibration: Sensitivity, Identifiability and Validation of YLD2000-2d

Abstract:

This paper revisits the long-standing question of how to fully characterise the in-plane plastic anisotropy of sheet metals without assembling evidence from multiple standardised tests. The central idea is pragmatic: a single, well-designed heterogeneous biaxial experiment can replace the conventional combination of uniaxial and equibiaxial tests if the specimen and the inverse identification method are co-designed to (i) activate informative stress states and (ii) maintain low strain gradients for accurate digital image correlation measurements. The proposed cruciform specimen is deliberately conceived as a benchmark configuration for full-field inverse identification, with known locations and stress-strain states at which relevant material information is embedded. The approach is coupled with a Finite Element Model Updating framework, enabling all anisotropy parameters of the YLD2000-2d model to be identified from a single full-field dataset. Sensitivity and identifiability analyses demonstrate that a physically based parameter formulation significantly improves the conditioning of the inverse problem. Virtual experimentation confirms the robustness and accuracy of the proposed “one-test” identification strategy.

• Periodical: Key Engineering Materials (Volume 1049)
• Pages: 107-114
• DOI: https://doi.org/10.4028/p-jZ5Rxd
• Online since: April 2026
• Authors: Bojan Starman*, Andraž Maček, Miroslav Halilovič, Pascal Lava, Fabrice Pierron, Sam Coppieters
• Keywords: Anisotropy, DIC, Finite Element Model Updating, Material Characterization, MT2.0

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