Effect of geometric parameters on dynamic fracture toughness of compact tensile specimens

• Zichun Yue ^[1] ; Xinhui Shen ^[2] ; Zhongliang Chang ^[1] ; Guangping Zou ^[1]
  1. [1] Harbin Engineering University

     Harbin Engineering University

     China

     
  2. [2] Chinese Academy of Sciences

     Chinese Academy of Sciences

     China

     
• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 53, Nº. 3, 2025, págs. 2116-2134
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • In this paper, the dynamic fracture toughness test and numerical simulation of CT specimens of 2A12-T4 aluminum alloy were carried out by using strain gauge method and finite element method based on Hopkinson tensile bar experiment device. The influence of crack transverse shape, loading hole size and dimension on the dynamic fracture performance of CT specimens was explained. The experimental and simulation results show that for CT specimens with different internal cracks, the time to reach stress equilibrium at the same tensile stress wave loading is roughly the same, while the time of initial cracking varies slightly. The dynamic fracture toughness obtained by concave arc-shaped internal crack and straight line-shaped internal crack is basically the same, while other changes in crack shape have a large impact. For CT specimens with straight line-shaped cracks, the position of the loading hole has a small effect on the dynamic fracture of the CT specimen under the same tensile stress wave. However, when the position of the loading hole is fixed, changing the diameter of the loading hole has a significant effect on the dynamic fracture toughness of the CT specimen.