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Material Properties
ENGR JC 2ND YR
| Question | Answer |
|---|---|
| What are the 5 engineering forces | Tension, Compression, Shear, Bending and Torsion. |
| What is tension | Tensile strength is the maximum pulling force a material can withstand before breaking. Cables and chains need to have this property. Like Resistance bands |
| What is compression | Compressive strength is the ability of a material to withstand squashing or compressive forces. Like a Hydraulic press |
| What is a Shear force | Shear strength is the ability of a material to withstand cutting forces. Like a Scissors cutting |
| What is a bending | Bending strength is the ability to resist bending forces. Like 3d Printed build plate |
| What is Torsion | Torsional strength is the ability to withstand a twisting force or torsion. Like a Salt grinder motion |
| What is strength | The ability of a material to withstand forces. |
| What is hardness | The ability of a material to resist wear, indentation and scratching. |
| What is ductility | The ability of a material to be permanently stretched without fracture by a tensile force. |
| What is malleability | The ability of a material to be extended in all directions without rupture by rolling or hammering. You can increase the malleability of a material by heating it. |
| What is toughness | The ability of a material to withstand blows or impacts. |
| What is Brittleness | This is the opposite to toughness. A brittle material can easily be fractured by an impact. |
| What is Elasticity | The ability of a material to return to its original shape when freed from the force that was distorting it. |
| What is Plasticity | The ability of a material to be permanently deformed without fracturing. Heating the material will improve its plasticity. |
| What is conductivity | The ability of a material to allow heat or electricity flow through it. |
| What is the process of increasing hardness | Hardening is a heat treatment process that involves heating the steel to a high temperature (cherry red). The heated steel is then quenched in oil or water, making the steel hard but also brittle. |
| What is the process of reducing brittleness | Tempering is when the hardened steel is gradually heated until a desired temper colour is achieved to strike the correct balance between hardness and toughness. The steel is then re-quenched at the desired tempering colour / temperature. |
| What is the process of softening a material | Annealing is a heat treatment process that involves heating the steel to a high temperature (cherry red). The heated steel is then allowed to cool slowly making it very soft |
| What is normalising | Refining the grain structure of steel and removes stresses caused by cold working like hammering or bending. Heat the steel to cherry red and allow it to cool naturally in still air, faster cooling than annealing, resulting in a harder structure. |
Created by:
georgejoseph
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