Shear testing is a very popular and valuable test method applicable to texture analysis.
This method applies slicing or 'shearing' to the product and is a good indication of the toughness of a material. It has numerous applications including testing the consistency of cosmetic and personal-care materials (eg lipstick hardness, deodorant brittleness..)
When testing foodstuffs it can also be considered as a good approximation to replicate the action of the front teeth when food is introduced into the mouth or being cut by a knife, during preparation and serving.
Shear testing typically involves measuring the force vs displacement profile of the material and calculating the maximum force to initiate shear together with the average force to maintain shear during the test.