Fatigue experiments assess the tendency for hair breakage, and consumer perceived hair loss, under the repeated application of small deformations. On the one-hand, this approach can be considered a more realistic simulation of consumer practices, where grooming represents such a stimulus, but in addition, these experiments almost always show bigger differences between samples than the traditional tensile testing approach.

Fatigue experiments can be done under different stresses and at different speeds.  The experts at TRI are highly experienced in this technique and can advise on the best protocol for your study and how data can be interpreted.