In this work, the influence of high and low temperatures on the spherical
indentation behavior of EPDM (ethylene propylene diene monomer) and
silicone rubber materials is systematically investigated by experiments
and numerical simulations. The temperature range is considered from
C to
C.
Indentation performances at high and low temperatures are measured by using the
electronic universal testing machine with the temperature test chamber. The
hyperelastic and viscoelastic constitutive models of rubber materials are considered
in the finite element simulation. The corresponding constitutive parameters are
determined by a uniaxial compression test and a dynamic mechanical analysis test.
The influences of temperature, loading rate, and holding time on indentation
behavior are discussed. And the contact pressure distribution is analyzed
under high- and low-temperature conditions. The results indicate that the
silicone rubber has a more stable indentation performance than that of the
EPDM rubber at both high and low temperatures. EPDM rubber is more
prone to indentation failure due to stress concentration in low-temperature
environments.
Keywords
rubber, spherical indentation, high and low temperatures,
visco-hyperelasticity
