Lesson 3 - Classification and Properties SAQ
This lesson allows you to test yourself on the material covered in the lesson on Classification and Properties and determine the level to which you have met the learning outcomes.
Suggested Response - Q3
*Match the terms in column 1 to the descriptions in column 2.
|
Column 1: Term |
Column 2: Meaning |
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Stiffness |
The amount of plastic deformation a material can withstand before breaking. |
|
Young’s Modulus |
Breaking, without first developing cracks or deformation in response to stress. |
|
Elasticity |
The ability to withstand a force without deforming. So if a material is very stiff there will be a very small change in its length for a comparatively large stress placed on it. |
|
Yield / proof strength |
The maximum stress a material can withstand before it fractures. |
|
Ultimate tensile strength (UTS) |
The slow deformation of a material under low stress. This can happen with metals at higher temperatures and polymers at lower temperatures. |
|
Ductility |
How well a material under stress returns to its original form after the stress is removed; when the stress exceeds the elastic limit the material is permanently deformed. |
|
Brittleness |
Resistance to impact. |
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Hardness |
The amount of stress needed to produce a permanent deformation. Beyond this point the material cannot return to its original. |
|
Toughness |
The ability to not be damaged by scratching, abrasion, indentation or abrasion its wear and tear resistance. |
|
Creep |
The ratio of stress to strain in the elastic region which is shown by the gradient of the line. If the gradient is steep the material is very stiff and if it is flat then the material is very elastic. |
Response:
|
Column 1: Term |
Column 2: Correct Meaning |
|
Stiffness |
The ability to withstand a force without deforming. So if a material is very stiff there will be a very small change in its length for a comparatively large stress placed on it. |
|
Young’s Modulus |
The ratio of stress to strain in the elastic region which is shown by the gradient of the line. If the gradient is steep the material is very stiff and if it is flat then the material is very elastic. |
|
Elasticity |
How well a material under stress returns to its original form after the stress is removed; when the stress exceeds the elastic limit the material is permanently deformed. |
|
Yield / proof strength |
The amount of stress needed to produce a permanent deformation. Beyond this point the material cannot return to its original dimensions. |
|
Ultimate tensile strength (UTS) |
The maximum stress a material can withstand before it fractures. |
|
Ductility |
The amount of plastic deformation a material can withstand before breaking. |
|
Brittleness |
Breaking, without first developing cracks or deformation in response to stress. |
|
Hardness |
The ability to not be damaged by scratching, abrasion, indentation or abrasion its wear and tear resistance. |
|
Toughness |
Resistance to impact. |
|
Creep |
The slow deformation of a material under low stress. This can happen with metals at higher temperatures and polymers at lower temperatures. |