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Related Concept Videos

Bending of Members Made of Several Materials01:08

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Quantitative Hardness Measurement by Instrumented AFM-indentation
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A comparative study of indentation size effect models for different materials.

Peina Wang1, Yu Gao2, Peihuan Wang3

  • 1Department of Stomatology, Xi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi'an, 710018, Shaanxi, China.

Scientific Reports
|August 28, 2024
PubMed
Summary
This summary is machine-generated.

This study evaluates sixteen indentation size effect (ISE) models using normal, reverse, and transition ISE data. The Nix-Gao-Feng and Nix-Gao-Haušild models show promise but require modification for accurate reverse ISE prediction.

Keywords:
Existing modelIndentation size effectNormal ISEReverse ISE

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • The indentation size effect (ISE) is critical in aerospace, nuclear, microelectronics, and medical applications.
  • Existing ISE models vary in complexity and parameters, necessitating a comparative analysis for optimal selection.
  • Understanding ISE is crucial for predicting material behavior at small scales.

Purpose of the Study:

  • To comparatively evaluate sixteen indentation size effect (ISE) models.
  • To identify the most accurate models for normal, reverse, and transition ISE phenomena.
  • To provide insights for developing improved future ISE models.

Main Methods:

  • Evaluation of sixteen ISE models using three types of ISE test data: normal, reverse, and transition.
  • Analysis of model performance based on determination coefficients (DC) for various materials.
  • Identification of key factors influencing ISE model accuracy.

Main Results:

  • Hou-Jennet, Nix-Gao-Feng, Nix-Gao-Haušild, Nix-Gao-Abu Al-Rub, and Nix-Gao-Qius models accurately predict normal ISE.
  • Specific models showed high accuracy for reverse ISE in NiCSi, TC4 titanium alloy, and PED Ni.
  • Nix-Gao-Yuan-Chen, Nix-Gao-Feng, and Nix-Gao-Haušild models excelled in predicting the transition of normal to reverse ISE for different materials.
  • The Nix-Gao-Feng model achieved the highest mean DC, followed by Nix-Gao-Haušild, but both struggle with reverse ISE prediction.

Conclusions:

  • Friction stress and plastic zone size effects should be incorporated into future ISE models.
  • The Nix-Gao-Feng and Nix-Gao-Haušild models require further refinement to accurately capture reverse ISE.
  • A comprehensive understanding of ISE across different material types and phenomena is essential for accurate material characterization.