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Temperature Dependent Deformation

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...

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Optimising dynamic mechanical analysis experiments on soft rubbers for use in time temperature superposition.

A R Trivedi¹, N Hawkins¹, C R Siviour¹

¹University of Oxford, Engineering Science, Oxford, Oxfordshire, United Kingdom.

|September 19, 2022

Summary

This study introduces an improved Dynamic Mechanical Analysis (DMA) method for rubbers. The enhanced technique provides higher quality data for understanding rubber mechanical response under varying rates and temperatures.

Keywords:

High strain rate Rate and temperature dependence Thermomechanical characterisation Viscoelasticity

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Area of Science:

Materials Science
Polymer Engineering
Mechanical Testing

Background:

Rubbers are critical in engineering, experiencing high strain rate deformation.
Their mechanical response is highly dependent on strain rate and temperature.
Accurate characterization of this rate-temperature dependence in soft rubbers is experimentally challenging.

Purpose of the Study:

To propose an improved methodology for Dynamic Mechanical Analysis (DMA) of rubbers.
To enhance the accuracy of characterizing the rate-temperature dependence of rubber materials.
To enable more precise application of time-temperature superposition (TTS) principles.

Main Methods:

Development of an improved DMA experimental methodology.
Focus on reducing clamping artifacts caused by volume expansion.
Ensuring superior temperature stability and optimizing specimen-clamp contact area.

Main Results:

The proposed methodology yields higher quality experimental data.
Improvements include minimized clamping artifacts and enhanced temperature stability.
Optimized contact between specimen and clamps leads to more reliable measurements.

Conclusions:

The improved DMA methodology offers a more accurate way to study rubber behavior.
Enhanced data quality facilitates more precise time-temperature superposition (TTS) analysis.
This advancement aids in a better understanding of rubber's rate-temperature dependent mechanical response.