Shear strain
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Shear strain is a strain that acts parallel to the face of a material that it is acting on. Normal strain acts perpendicular to the face of that it is acting on. There are two ways to interpret shear strain: the average shear strain and the engineering shear strain. The variable used to denote average shear strain is 
while 
denotes engineering shear strain.
Consider an infinitesimal rectangle in the xy plane subject to shear strain. The rectangle becomes a parallelogram where 
is the displacement from the y axis in the x direction and 
is the displacement from the x axis in the y direction. The average shear strain is
[edit] Definition of engineering shear strain
where
is the angle before deformation and
is the angle at that same point after deformation.
Therefore describes the total deformation.
[edit] See also
- Shear modulus
- Moiré pattern (the Moiré effect can be used to measure strain)
- Shear stress
- Shear strength
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