Nonlinear biaxial tensile stress path experiment without intermediate elastic unloading for validation of material model. (5th December 2022)

• Record Type: Journal Article
• Authors: Takada, Yusuke; Kuwabara, Toshihiko
• Is Part Of: International journal of solids and structures. Volume 257(2022)
• Publication Date: 2022-12-05
• Subjects: Mechanical test -- Mild steel sheet -- Biaxial tensile test -- Contour of plastic work -- Plastic strain rate -- Yield function -- Nonlinear stress path; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2022.111777
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: A linear stress path (LSP) experiment was performed using uniaxial and biaxial tensile tests with a cold-rolled mild steel sheet (SPCD; nominal thickness: 0.8 mm) as the test material. In the LSP experiment, the contours of plastic work and the directions of the plastic strain rates, β, for a plastic strain range of 0.002 ≤ ε 0 p ≤ 0.234 were measured. Then, the Yld2000-2d yield function was used to identify a material model that accurately reproduces the experimental data. Stepped nonlinear stress path (NLSP) experiments were also performed; the NLSPs consisted of several linear stress paths without intermediate elastic unloading. The measured work hardening behavior and β values were compared with those calculated using the yield functions identified from the LSP experiment, namely the von Mises, Hill's quadratic, and Yld2000-2d yield functions. For the Yld200-2d yield function, both isotropic and differential hardening models were investigated. It was found that the data measured in the NLSP experiment are consistent with calculation results obtained using the Yld2000-2d yield function identified from the LSP experiment. Thus, it can be concluded that within the range of stress paths adopted in the NLSP experiment, the deformation behavior of a test sample can be accurately predicted using the material model identified from an LSP experiment.