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University Engineering

Notes by Category University Engineering

Electronics*
Mathematics*
Mechanics & Stress Analysis*
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Material Properties and Engineering vs True Stress & Strain

A material property can be defined as a specific characteristic in reaction to a certain stimulus.

These properties differ between materials, but generally materials can be grouped into one of four types, based on their properties and structure:

  • Metals & Alloys

  • Ferrous Metals, such as steels and cast irons

  • Non-ferrous metals, such as copper, aluminium, tungsten and titanium

  • Plastics

  • Thermoplastics, such as polythene, polypropylene, acrylics, nylons and PVC

  • Thermosets, such as polyimides, phenolics and epoxies

  • Elastomers, such as rubbers, silicones and polyurethanes

  • Ceramics & Glasses

  • These include oxides, nitrates, carbides, diamond and graphite

  • Composites

  • Polymer, metal, and ceramic matrices




Basic Properties

Strength

A material’s ability to carry loads without deforming


Young’s Modulus

A material's ability to resist deformation under tensile or compressive loading

Stiffness and ductility are not material properties, as they are geometry-dependent

Hardness

A material's ability to resist wear, scratching or indentation


Fatigue Strength

A material's ability to resist deformation caused by repeated (often cyclical) loading


Creep Strength

A material’s ability to resist deformation caused by a constant and unchanging load over a prolonged period of time


Toughness

A material’s ability to resist fracturing


Chemical Properties

These are also important material properties, and include

  • Density