Stress–strain Curve - Tensile Stress

Tensile Stress

Consider a bar of cross sectional area A being subjected to equal and opposite forces F pulling at the ends. If this were a rope, we would say that it is experiencing a tension force. Taking this concept over, we say that the bar is under tension, and is experiencing a stress that we define to be the ratio of the force to the cross sectional area

Stress = F/A (62)

This stress is called the tensile stress because every part of the object is subjected to a tension. The SI unit of stress is the Newton per square meter, which is called the Pascal 1 Pascal = 1 Pa = 1 N/m2

Shear Stress and Strain

Now consider a force that is applied tangentially to an object

The ratio of the shearing force to the area A is called the shear stress

If the object is twisted through an angle q, then the strain is

Shear Strain = tanq Finally, we can define the shear modulus, MS, as

The shear modulus is also known as the torsion modulus

Read more about this topic:  Stress–strain Curve

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