1.4 Properties and Application of Materials in Power Mechanics

• explain properties of materials used in power mechanics
• identify common materials used in power mechanics
• relate properties of material to their uses in power mechanics
• appreciate the importance of materials in power mechanics

“How are properties of materials important in power mechanics?”

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1. Strength under four loads
   40 min · 1 practice tasks · quiz
   Name tensile, compressive, shear and torsional loads, and calculate one tensile stress.
2. Strain
   40 min · 1 practice tasks · quiz
   Calculate tensile and compressive strain as a change divided by the original size, and keep that ratio apart from strength.
3. Hardness, elasticity and resilience
   40 min · 1 practice tasks · quiz
   Separate a hard surface from a springy one, and find the energy a spring stores when the force grows evenly.
4. Rigidity, weldability and fusibility
   40 min · 1 practice tasks · quiz
   Separate stiffness from strength, and separate a metal that welds from a metal that is cast or a filler that only melts.
5. Embeddability in a bearing
   40 min · 1 practice tasks · quiz
   Explain how a soft bearing lining traps grit, while the steel back carries the load.
6. Steel and cast iron
   40 min · 1 practice tasks · quiz
   Tell mild steel from cast iron by behaviour and use, and keep a high-carbon file out of the weldable group.
7. Aluminium alloys and copper
   40 min · 1 practice tasks · quiz
   Compare masses with the lesson densities, and match aluminium alloys and copper to heat, weight and electrical jobs.
8. Glass, plastic, rubber and the use table
   40 min · 1 practice tasks · quiz
   Match laminated glass, toughened glass, plastic and rubber to parts, and build the property-use table.