THERMOPLASTIC ELASTOMERS EXPOSED TO DYNAM IC STRESS

Stress-strain measurements alone provide insufficient information to a ppropriately assess the fatigue behaviour of TPEs. However, such measu rements do supply important preliminary information concerning structu ral changes, and they help define stress values for further investigat ions. In stress-controlled or strain-controlled dynamic tests based on hysteresis measurements, changes of characteristic values, such as ex pansion or impedance values, are used to define upper stress limits.