4.10.5

Plasticity

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Plastic and Brittle Behaviour

Objects respond differently to a wide range of stresses and strains.

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Plastic behaviour

  • An object behaves plastically if it undergoes permanent deformation under stress.
  • Plastic behaviour occurs after the elastic limit.
  • Stretching strawberry laces is an example of plastic behaviour.
  • To identify areas of plastic behaviour on a force-extension graph, look to the right of the elastic limit point.
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Brittle behaviour

  • An object is brittle if it breaks suddenly and cracks. There will be very little plastic behaviour shown.
  • An example of a brittle food is hard sugar sweets.
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Fractures

  • Fractures happen when the material completely breaks.

Jump to other topics

1Principles of Science I

1.1Structure & Bonding

1.2Properties of Substances

1.3Cell Structure & Function

1.4Cell Specialisation

1.5Tissue Structure & Function

1.6Working with Waves

1.7Waves in Communication

2Practical Scientific Procedures and Techniques

3Science Investigation Skills

4Principles of Science II

4.1Extracting Elements

4.2Relating Properties to use of Substances

4.3Organic Chemistry

4.4Energy Changes in Industry

4.5The Circulatory System

4.6Ventilation & Gas Exchange

4.7Urinary System

4.8Cell Transport

4.9Thermal Physics

4.10Materials

4.11Fluids

5Contemporary Issues in Science

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