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<p>To characterize the fracture of engineering ductile materials under triaxial stress, a H62 brass standard bi-fracture specimen was selected, using the three-dimensional digital image correlation method. The results indicate that the specimen did not experience bi-fracture modes. In terms of the variation of the strain field, the displacement fields of the standard bi-fracture specimens in the <i>x</i> and <i>z</i> axis directions are distributed in an up-and-down parallel and symmetrical manner. In the <i>y</i>-axis direction, they are distributed in a left-right parallel and symmetrical manner. The strain fields of the asymmetric bi-fracture specimens in the <i>x</i> and <i>y</i> axes and <i>xy</i> plane directions are all symmetrically distributed at a 45° angle, and the strain at the middle notch reaches the maximum value. The inner side of the outer edge of the hole is in the tensile state, and the outer side is in the compressed state. Based on material characteristics obtained from experiments, the Gurson–Tvergaard–Needleman (GTN) plastic-damage constitutive model was employed to predict the material’s ductile fracture performance. Comparing the predicted results with the experiment, it is verified that the force/displacement response curve aligns well with the strain field.</p>

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Ductile Fracture Study of H62 Dual-Crack Specimens Using Digital Image Correlation

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Z. X. Chen,
  • W. X. Wang,
  • L. Tao,
  • S. F. Huang,
  • X. L. Peng,
  • J. T. Sun

摘要

To characterize the fracture of engineering ductile materials under triaxial stress, a H62 brass standard bi-fracture specimen was selected, using the three-dimensional digital image correlation method. The results indicate that the specimen did not experience bi-fracture modes. In terms of the variation of the strain field, the displacement fields of the standard bi-fracture specimens in the x and z axis directions are distributed in an up-and-down parallel and symmetrical manner. In the y-axis direction, they are distributed in a left-right parallel and symmetrical manner. The strain fields of the asymmetric bi-fracture specimens in the x and y axes and xy plane directions are all symmetrically distributed at a 45° angle, and the strain at the middle notch reaches the maximum value. The inner side of the outer edge of the hole is in the tensile state, and the outer side is in the compressed state. Based on material characteristics obtained from experiments, the Gurson–Tvergaard–Needleman (GTN) plastic-damage constitutive model was employed to predict the material’s ductile fracture performance. Comparing the predicted results with the experiment, it is verified that the force/displacement response curve aligns well with the strain field.