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Write about Uzbek traditions
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BUILDING MATERIALS
The common characteristics of building materials under stress are ductility, brittleness, stiffness,
flexibility, toughness, malleability and hardness.
The ductile materials can be drawn out without necking down, the examples being copper and
wrought iron.
Brittle materials have little or no plasticity. They fail suddenly without warning. Cast iron, stone,
brick and concrete are comparatively brittle materials having a considerable amount of plasticity.
Stiff materials have a high modulus of elasticity permitting small deformation for a given load.
Flexible materials on the other hand have low modulus of elasticity and bend considerably