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STRENGTH: The ability of a material to stand up to forces being applied without it bending, breaking, shattering or deforming in any way.
TOUGHNESS: ability of a material's resistance to fracture. It is often expressed in terms of the amount of energy a material can absorb before fracture.
BRITTLENESS: disability of a material to undergo plastic deformation.
HARDNESS The ability of a material to resist scratching, wear and tear and indentation.
Fatigue is the lowering of strength or failure of a material due to repetitive stress, which may be above or below the yield strength.
Cracks generally grow under repeated loading
Trucks passing over bridges,
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