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For the Classroom - Material Properties |
Objectives:
Introduce students to various material properties.
Discussion Topics:
Density:
- Familiarize students some of the more common metals
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Strength vs. Weight
- Corrosion resistant, non-magnetic, etc.
Shore Durometer:
- Introduction to Shore Durometer
- Different Shore Durometer scales
- Why is Shore Durometer important
- Tables provides a realistic comparison to common items
Hardness Conversion:
- Explain that the Hardness of a material is it’s ability to resist penetration, indentation, and scratching (plastic deformation)
- Explain the Tensile Strength of a material - Introduce students to the Stress vs. Strain Curve
- Show how Hardness and Tensile are measured
Thermoplastic Properties:
- Introduction to different types of plastics
- The various properties of plastics that need to be considered (The categories shown in the table are some of the more important properties to consider during the design process)
- Colors
- Standard sizes and profiles that are commonly available (McMaster-Carr, Reid, etc.)
Classroom Practice (with other supporting materials):
- Show samples of different Shore Durometers
- Show samples of common plastics
- Discuss considerations when selecting materials
- Strength
- Weight
- Cost
- Application (i.e. under water, corrosive, UV, etc)
- Ease of machinability, fabrication, etc.
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