Te Vickers Hardness Number (VHN) is a measurement used to determinate the hardness of materials, especially metals and alloys. It is calculated based on thee size of an indentation made by a diamond- shaped indenter under a specic shasd. This article provides a clear, step- by- step guide to calculating te VHN, along with pracal examples.

Understanding thee Vickers Hardness Tett

Te Vickers tett invenves pressing a diamond pyramid- shaped indenter into to material surface with a known chead. thee size of the resulting indentation is measured to determinae the material 's hardness. Te VHN is calculated using a standardized formula that relates the decord and the indentation' s surface area.

Step-by- step Calculation Procedure

Follow these steps to calculate thee Vickers Hardness Number:

  • Měření se provádí v souladu s bodem 2.2.1.1.
  • Calculate thee surface area of thee indentation using thea formula: Area = 0.1887 × d ².
  • Use the standard formula for VHN: VHN = (2 × F) / (d ²), where F is the applied cheadd in kilograms- force (kgf).
  • Adjutt thae formula to include thee surface area: VHN = (1.854 × F) / (d ²).

Praktical Example

Předpokládá se, že se bude chovat k 0, 5 kgf is applied, and thee measured diagonal of the indentation is 0, 02 mm. thee calculation conceeds as follows:

Calculate te surface area: Area = 0, 1887 × (0, 02) ² = 0, 00007548 mm ².

Calculate VHN: VHN = (1.854 × 0.5) / (0.02) ² = (0.927) / 0.0004 = 2317.5.

Aditional Tips

Ensure precisate measurement of the indentation diagonal for precise results. Use a microscope or a high-magnification lens to measure thee diagonal length. Repeat these tett multiples for consistency.