In a biological material the measured strain is a function of stress, time and temperature. When a material undergoing a constant strain will begin to relax, we call this phenomenon

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When a material undergoing a constant strain begins to relax, this phenomenon is called stress-relaxation. This is because the stress decreases over time while the strain remains constant. Viscoelasticity refers to the property of materials that exhibit both viscous (flow under stress) and elastic (recover their shape after stress) behavior. Creep is the gradual deformation of a material under stress over time. Hysteresis refers to the dependence of a system's output not only on its current input but also on its history of past inputs.

In a Biological Material the Measured Strain Is a Function