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<p>This paper investigates the mechanical behavior of AA2024-T4 under various tension-dominated loading conditions using dog-bone, butterfly, plane strain, and notched specimens with three different notch radii. The results indicate that the total deformation of each specimen is non-uniform, and the location of strain concentration varies with the specimen type. It is also shown that the stress and strain state can be effectively controlled by altering the specimen size and geometry. Furthermore, by employing finite element simulations to extract the stress state at fracture initiation for different specimen types, it is revealed that both stress triaxiality and the Lode parameter jointly influence the equivalent fracture strain of the material. Based on the DF2012 fracture criterion, a modified failure criterion is proposed by introducing a hyperbolic functional relationship for the effects of stress triaxiality and the Lode parameter, thereby achieving accurate prediction of the equivalent fracture strain of AA2024-T4.</p>

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Mechanical Behaviors of AA2024-T4 Under Various Stress States Dominated by Tension: Deformation Responses, Strain Paths, Stress Analysis and Failure Modeling

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Anfeng Yu,
  • Haozhe Wang,
  • Junhai Li,
  • Meng Gu,
  • Jinlei Zheng,
  • Guoxin Chen,
  • Xin Li

摘要

This paper investigates the mechanical behavior of AA2024-T4 under various tension-dominated loading conditions using dog-bone, butterfly, plane strain, and notched specimens with three different notch radii. The results indicate that the total deformation of each specimen is non-uniform, and the location of strain concentration varies with the specimen type. It is also shown that the stress and strain state can be effectively controlled by altering the specimen size and geometry. Furthermore, by employing finite element simulations to extract the stress state at fracture initiation for different specimen types, it is revealed that both stress triaxiality and the Lode parameter jointly influence the equivalent fracture strain of the material. Based on the DF2012 fracture criterion, a modified failure criterion is proposed by introducing a hyperbolic functional relationship for the effects of stress triaxiality and the Lode parameter, thereby achieving accurate prediction of the equivalent fracture strain of AA2024-T4.