Calibration of anisotropic plasticity models using a biaxial test and the virtual fields method

• Published in: International journal of solids and structures Vol. 172-173; pp. 21 - 37
• Main Authors: Martins, J.M.P., Andrade-Campos, A., Thuillier, S.
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01.11.2019; Elsevier BV; Elsevier
• Subjects: Anisotropic plasticity; Anisotropy; Biaxial tests; Calibration; Cruciform test; Cruciform tests; Engineering Sciences; Full-field measurements; Hardening; Parameter identification; Plastic anisotropy; Plastic properties; Virtual fields method; Yield criteria; Yield strength; Parameter identification; Virtual fields method; Anisotropic plasticity; Cruciform test; Full-field measurements
• ISSN: 0020-7683; 1879-2146
• DOI: 10.1016/j.ijsolstr.2019.05.019

The aim of the present study is to explore the combination of a biaxial test with a cruciform specimen and the virtual fields method to develop an efficient strategy for simultaneous identification of material parameters related with hardening and anisotropy in plasticity. In a first step, three cruciform geometries are evaluated as potential candidates to generate an experimental database for the calibration of the classical Hill’48 yield criterion and Swift’s hardening law. In a second step, the geometry with the best results is used to calibrate YLD2000-2d yield criterion and Swift’s hardening law. Numerical results are used as virtual experimental full-field measurements, which allows the comparison of the identified solution with the input material parameters. The accuracy of the identified material parameters is thoroughly assessed through the analysis of flow stress curve evolution, normalised yield stresses and plastic anisotropy coefficients, and for the last step, yield locus prediction. The results show the potential of this combination to identify simultaneously the material parameters related to hardening and anisotropy with a single test.