2ºPost

  The basic stresses 

The basic stresses that a body may have to support are compression,tension,bending,torsion and shear.

 Compression:This is caused by forces acting on a body that tend to flatten it or reduce its length or thickness.

Tension:This is caused by forces acting on a body that tend to strech it.

Bending:This is caused by forces acting on an element that make it curve or bend.

Torsion:This caused by forces acting on a body that make it twist.

Shear: This is caused by two equal forces applied in opposite directions that act on lines of action close to each other.

What is rigidity?

If a material is rigid it does not change shape when force is applied to it.

Exercise 12: Think about the following objects and state whether they are rigid, plastic or elastic.

Ballon: Elastic  

Empty drinks can: Plastic

Window frame: Rigid 

Clay: Rigid 

Catapult: Rigid 

Door: Rigid