Sample interview questions: How do you assess the tribological properties and friction behavior of materials in your research?
Sample answer:
Assessment Methods for Tribological Properties and Friction Behavior:
1. Pin-on-Disk Tribometer:
- Measures friction coefficient, wear rate, and material deformation under controlled contact conditions.
- Rotates a sample against a pin under variable loads and sliding speeds.
2. Ball-on-Flat Tribometer:
- Similar to the pin-on-disk but uses a ball to contact the sample, creating a point contact.
- Provides insights into local contact properties and friction behavior under micro-scale loads.
3. Scratch Test:
- Indents a sharp indenter into the sample using a controlled load profile.
- Measures the friction coefficient and plastic deformation as the indenter traverses the surface.
4. Micro-Indentation Hardness Test:
- Determines the hardness of the material through indentation.
- Hardness is inversely related to wear resistance, providing an indication of tribological performance.
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