In mechanics and geology, pure shear is a three-dimensional homogeneous flattening of a body. It is an example of irrotational strain in which a body is elongated in one direction while being shortened perpendicularly. For soft materials, such as rubber, a strain state of pure shear is often used for characterizing hyperelastic and fracture mechanical behavior.  
Pure shear stress-strain relation
where is the shear modulus of the material, given by
- Reish, Nathaniel E.; Gary H. Girty. "Definition and Mathematics of Pure Shear". San Diego State University Department of Geological Sciences. Retrieved 24 December 2011.
- "Pure shear". Answers.com. Retrieved 24 December 2011.
- "Where do the Pure and Shear come from in the Pure Shear test?". Retrieved 12 April 2013.
- "Comparing Simple Shear and Pure Shear". Retrieved 12 April 2013.
- "Strength of Materials". Eformulae.com. Retrieved 24 December 2011.
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