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<p>The interlaminar fracture toughness in Mode I was investigated using DCB-type specimens made of carbon fiber-reinforced plastic (CFRP) based on balanced fabric 3752, according to ASTM D5528, using the compliance calibration method. To reduce errors in determining this parameter, the compliance of the testing machine’s force chain was accounted for. Calculations of the necessary correction factors, as well as the cube root of the normalized compliance of the specimens as a function of delamination length, were performed for cases of failure along the midplane of the specimens, their asymmetric delamination, and failure of the carbon fabric layer. For these cases, the characteristics of changes in the aforementioned parameters were established. A strong relationship was observed between the cube root of the normalized compliance of DCB specimens and the current delamination length, with a correlation coefficient of 0.9975. Additionally, the fracture toughness during delamination development in the specimens was determined using the classical beam theory method. For each set of calculated fracture toughness values during delamination development in the specimens, a linear regression equation was fit for each method. As a result, it was established that the calculated fracture toughness in Mode I using the conventional beam theory method is 11% higher than the corresponding values determined using the compliance calibration method.</p>

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Interlaminar Mode I Fracture Viscosity of Woven Carbon Fiber-Reinforced Plastic: Experimental Study

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • O. V. Drozdov,
  • Yu. M. Volkov,
  • I. I. Derevyanko,
  • O. P. Romenska

摘要

The interlaminar fracture toughness in Mode I was investigated using DCB-type specimens made of carbon fiber-reinforced plastic (CFRP) based on balanced fabric 3752, according to ASTM D5528, using the compliance calibration method. To reduce errors in determining this parameter, the compliance of the testing machine’s force chain was accounted for. Calculations of the necessary correction factors, as well as the cube root of the normalized compliance of the specimens as a function of delamination length, were performed for cases of failure along the midplane of the specimens, their asymmetric delamination, and failure of the carbon fabric layer. For these cases, the characteristics of changes in the aforementioned parameters were established. A strong relationship was observed between the cube root of the normalized compliance of DCB specimens and the current delamination length, with a correlation coefficient of 0.9975. Additionally, the fracture toughness during delamination development in the specimens was determined using the classical beam theory method. For each set of calculated fracture toughness values during delamination development in the specimens, a linear regression equation was fit for each method. As a result, it was established that the calculated fracture toughness in Mode I using the conventional beam theory method is 11% higher than the corresponding values determined using the compliance calibration method.