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

Other articles related to "tensile stress, stress, tensile":

Precipitation Strengthening - Theory
... Smaller precipitate particles in a host lattice leads to a tensile stress, whereas larger precipitate particles leads to a compressive stress ... Dislocation defects also create a stress field ... Above the dislocation there is a compressive stress and below there is a tensile stress ...
Solder Alloys
... Pb 3 ... Sn56Pb39Ag5 Pb 5 ... Sn98Ag2 – 2 ... Sn65Ag25Sb10 233 – yes Very high tensile strength ... The resulting joints have high tolerance to vibration and stress, with tensile strengths to 30,000 psi on Stainless ... joints have high tolerance to vibration and stress, with tensile strengths to 31,000 psi on Stainless ...

Famous quotes containing the word stress:

    Like all weak men he laid an exaggerated stress on not changing one’s mind.
    W. Somerset Maugham (1874–1966)