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<p>Coating technologies are used to improve the mechanical, chemical, or electrical properties of thin films on surfaces. Among them, the study of DLC-type thin films can be mentioned as they have high hardness, chemical inertia, and a low coefficient of friction when in contact with various materials, which are ideal characteristics for enhancing the performance of cutting tools. To identify these films’ properties, it is essential to conduct mechanical tests such as nanoindentation, which can provide key insights for understanding and improving coating techniques. When combined with the finite element method, nanoindentation can yield more detailed results on the material’s behavior during testing. Considering this, the present study investigated nanoindentation test simulation applications on a high-speed steel specimen with DLC coating. The accuracy of the two-dimensional test simplification was compared to the three-dimensional model. Due to the simplification of the Berkovich indenter in the two-dimensional model, the results showed lower accuracy when compared to the actual experiment. Furthermore, the thickness of the DLC film was varied to assess the impact of hardness in relation to the film thickness. A film thickness of 2.0&#xa0;µm showed better results compared to thicknesses of 1.0 and 1.5&#xa0;µm. Finally, the feasibility of using the finite element method for simulating the nanoindentation test was observed as a way to complement or replace experimental testing, in which the limitation was the purpose of conducting the tests. This is applicable in cases where the mechanical properties of the specimen are known.</p>

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Nanoindentation test simulation of a high-speed steel substrate with DLC coating and a Berkovich indenter using a two-dimensional and three-dimensional axisymmetric simplification finite element method

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Vitor Ferreira Vieira,
  • Yukio Shigaki,
  • Paulo Sérgio Martins,
  • Elhadji Cheikh Talibouya Ba,
  • Pedro Miraglia Firpe

摘要

Coating technologies are used to improve the mechanical, chemical, or electrical properties of thin films on surfaces. Among them, the study of DLC-type thin films can be mentioned as they have high hardness, chemical inertia, and a low coefficient of friction when in contact with various materials, which are ideal characteristics for enhancing the performance of cutting tools. To identify these films’ properties, it is essential to conduct mechanical tests such as nanoindentation, which can provide key insights for understanding and improving coating techniques. When combined with the finite element method, nanoindentation can yield more detailed results on the material’s behavior during testing. Considering this, the present study investigated nanoindentation test simulation applications on a high-speed steel specimen with DLC coating. The accuracy of the two-dimensional test simplification was compared to the three-dimensional model. Due to the simplification of the Berkovich indenter in the two-dimensional model, the results showed lower accuracy when compared to the actual experiment. Furthermore, the thickness of the DLC film was varied to assess the impact of hardness in relation to the film thickness. A film thickness of 2.0 µm showed better results compared to thicknesses of 1.0 and 1.5 µm. Finally, the feasibility of using the finite element method for simulating the nanoindentation test was observed as a way to complement or replace experimental testing, in which the limitation was the purpose of conducting the tests. This is applicable in cases where the mechanical properties of the specimen are known.