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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Famous quotes containing the word stress:
“Like all weak men he laid an exaggerated stress on not changing ones mind.”
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