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<p>A comprehensive experimental-numerical framework is established in this work to characterize the formability and anisotropy of 1420 Al-Li alloy sheet using uniaxial and biaxial tensile tests. Forming limit curves at both localized necking and fracture were experimentally characterized under various strain paths. Anisotropic Barlat’s Yld2000-2D yield criterion parameters were identified via inverse identification based on heterogeneous strain fields measured from notched cruciform specimens. The identified yield function was coupled with Voce hardening and Johnson-Cook damage model, and implemented into finite element simulations through a user-defined subroutine in Abaqus software. Numerical predictions of both necking and fracture limits demonstrated good agreement with experimental observations, particularly under biaxial and plane strain states.</p>

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Forming Limit Curve Construction and Identification of Yld2000-2D Yield Criterion Parameters

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Jiaqi Sun,
  • Zhihao Wang,
  • Chengxin Liu,
  • Weichi Zhang,
  • Xingrong Chu

摘要

A comprehensive experimental-numerical framework is established in this work to characterize the formability and anisotropy of 1420 Al-Li alloy sheet using uniaxial and biaxial tensile tests. Forming limit curves at both localized necking and fracture were experimentally characterized under various strain paths. Anisotropic Barlat’s Yld2000-2D yield criterion parameters were identified via inverse identification based on heterogeneous strain fields measured from notched cruciform specimens. The identified yield function was coupled with Voce hardening and Johnson-Cook damage model, and implemented into finite element simulations through a user-defined subroutine in Abaqus software. Numerical predictions of both necking and fracture limits demonstrated good agreement with experimental observations, particularly under biaxial and plane strain states.