Tutorial Topic 1: Properties of materials
1. In terms of the mechanical properties of materials, describe the term hardness.
2. Name 5 indenter scales (hardness test methods) and describe 2 of these processes.
3. Sketch the stress-strain curve for a brittle material and give an example of a brittle material.
4. Fill in the blanks on the following tensile test graph.
5. What is the elastic limit of a material?
6. The following data were collected from a 12-mm-diameter test specimen magnesium (l0 = 30.00mm):
Load (N) 0 5,000 10,000 15,000 20,000 25,000 26,500 27,000 26,500 25,000
l (mm) 0 0.0296 0.0592 0.0888 0.15 0.51 0.90 1.5 (maximum load) 2.10 2.79 (fracture)
After fracture, the total length was 32.61mm and the diameter was 11.74mm. Plot the engineering stress-strain curve and calculate:
a. the 0.2% offset yield strength;
b. the tensile strength; 00.20.5% Materials tutorial April 2019
