Thermal and energy analysis of DMTA tests

This paper investigates the suitability of isothermal linear viscoelastic framework to describe behavior polymers observed during DMTA tests. A good interpretation these tests is important because, in practice, they are used construct master curves using time-temperature superposition principle at small strain. These then considered predict material under experimentally unreachable thermal and/or loading frequency conditions. Currently, protocol neglects temperature variations induced by deformation polymers. We wonder if can have an influence on measurement dynamic moduli. To answer this question, quantitative infrared techniques were developed and assess samples undergoing cyclic loadings mechanical spectrometry Thermal data quantify viscous dissipated thermoelastic coupling energies that be both associated with hysteretic stress-strain response Energy balances performed relative importance dissipative heat sources. From energy standpoint, it found rate was dozens times higher than dissipation. Especially low frequencies, effects a greater loss modulus value viscosity.