Iron+and+Steel

****Wood:**** The wood is very strong when compressed. It is also a very cheap material. But when the wood is stretched is rather strong.Is used in bridges, houses,etc.
 * Interactive Materials Lab (Taking Notes)**

On compression, the plastic is more resistant than wood.On stretching, plastic is less resistant than wood. However, the plastic is much more expensive than wood.The plastic is heavier than wood.Is used in umbrellas,inflatable roofs over sports arenas.
 * Plastic:**

On compression and stretching, aluminum resists more than wood and plastic. However it is more expensive than wood and lighter than the brick. Is used in airplanes, wings,boats, cars, skyscrapers "skin".
 * Aluminum:**

In compression, brick less resistance than wood, plastic and aluminum. The same happens when the brick is subjected to stretching. However, the brick is cheaper than aluminum. **Concrete:** Concrete is heavier than brick. It is cheaper than aluminum. Weighs more than aluminum and brick. Has less resistance to compression and stretching than aluminum. Is used in early arch bridges and domes.Is used in walls of early skyscrapers, tunnels and domes.
 * Brick:**

Reinforced concrete is heavier than concrete. It has greater resistance to compression and supports more stress than concrete. However it is more expensive than concrete and less resistance than aluminum. Is used in bridges, dams, domes, beams and columns in skyscrapers. Cast iron has properties similar to brick. However, it is heavier and more expensive than brick. It has almost the same price than steel. Is used in arch bridges, cannons, historic domes. Is a very expensive and heavy. However resists compression and tension forces better than other materials. Is used in trusses, beams, and columns y¡in skyscrapers. ** Chatlog on Iron and Steel **
 * Reforzed Concrete:**
 * Cast Iron:**
 * Steel:**











** Iron and Steel Structures **