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<p>This study presents the first systematic evaluation and comparison of six classical uncoupled ductile fracture criteria (DFC) for the B10 alloy, identifying the Oyane–Sato and modified Mohr–Coulomb criteria as the most accurate for fracture prediction under a wide range of stress states. A series of uniaxial and notch tensile and compressive tests were conducted. By combining experiments with finite element simulation, the triaxiality of stress and the dependence of Lode parameters on equivalent plastic strain were calculated. An optimization-based objective function method was used to calibrate the parameters of each criterion. Subsequently, fracture envelopes and fracture trajectories were constructed in both two-dimensional and three-dimensional spaces to systematically assess the influence of stress state on fracture prediction. Finally, the calibrated models were applied in finite element simulation for fracture prediction validation, and the results indicate that the Oyane–Sato and modified Mohr–Coulomb criteria achieved high predictive accuracy, with prediction errors of 1.70% and 2.29%, respectively.</p>

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Evaluation of Ductile Fracture Criteria and Fracture Prediction for B10 Copper–Nickel Alloy Tubes Under Various Stress States

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Yiwen Yu,
  • Zhengkang Zhu,
  • Jun Cai,
  • Wei Song,
  • Chongchong Li,
  • Ke Qiao,
  • Bing Zhang,
  • Wen Wang,
  • Kuaishe Wang,
  • Qian Zhao

摘要

This study presents the first systematic evaluation and comparison of six classical uncoupled ductile fracture criteria (DFC) for the B10 alloy, identifying the Oyane–Sato and modified Mohr–Coulomb criteria as the most accurate for fracture prediction under a wide range of stress states. A series of uniaxial and notch tensile and compressive tests were conducted. By combining experiments with finite element simulation, the triaxiality of stress and the dependence of Lode parameters on equivalent plastic strain were calculated. An optimization-based objective function method was used to calibrate the parameters of each criterion. Subsequently, fracture envelopes and fracture trajectories were constructed in both two-dimensional and three-dimensional spaces to systematically assess the influence of stress state on fracture prediction. Finally, the calibrated models were applied in finite element simulation for fracture prediction validation, and the results indicate that the Oyane–Sato and modified Mohr–Coulomb criteria achieved high predictive accuracy, with prediction errors of 1.70% and 2.29%, respectively.