Abstract
Dynamic Mechanical Analysis is an experimental technique commonly used to study the viscoelastic behaviour of materials over a range of temperatures and frequencies. Although considered as a forced non-resonance technique, the warned users perfectly know that resonant frequencies are inevitably encountered on the typical frequency range of DMA apparatus. In consequences, the measured properties in the area of the resonant frequencies are completely perturbed. This work proposes an analysis of the dynamic behaviour of a Bose Electroforce DMA. The resonant and perturbed frequencies have been identified in different experimental configurations using several materials. A straightforward analytical model was developed to simulate and predict the dynamic behaviour of our apparatus. The model parameters are identified using different experimental configurations. The simulations delivered by the model allow the user to predict the perturbed frequency areas and by this way authorise a strategic definition of the experimental protocol according to the sample characteristics.
Highlights
Many methods and apparatus are nowadays available to investigate the viscoelastic behaviour of materials
The dynamic mechanical analyser (DMA) used in this study is a Bose Electroforce 3200 apparatus controlled by a personal computer
The most remarkable effect is the smooth peak located near 70 Hz, which is visible for nearly each cyclic loading frequency and reveals a resonance effect due to the dynamic behaviour of the whole setup
Summary
Many methods and apparatus are nowadays available to investigate the viscoelastic behaviour of materials. Due to its simplicity, the dilatometric method was the only method used to determine the glass transition temperature Tg. DSC (Differential Scanning Calorimeter) or DTA (Differential Thermal Analysis) are common tool of laboratory. Dielectric Thermal Analysis (DETA) is quite a common method to explore molecular phenomena like relaxation. We often discern dynamic tests from quasi-static methods: creep and relaxation. Dynamic mechanical methods include ultrasound and a variety of resonant techniques. The free-free flexural method exploits the frequency resonance of materials. The methods are based on ultrasonic wave propagation. This type of experiment is used to measure stiffness rather than to determine internal friction
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