Application of Linear Viscoelastic Continuum Damage Theory to the Low and High Strain Rate Response of Thermoplastic Polyurethane

H Chen,C R Siviour

doi:10.1007/978-3-030-29986-6_23

Abstract

This paper outlines an empirical correlation method combining quasi-static tests in tension and compression, and high strain-rate tests in compression, with dynamic mechanical analysis and time-temperature superposition. A generalized viscoelastic model incorporating continuum damage is calibrated. The results show that a model calibrated using data from quasi-static compression and dynamic mechanical analysis can be used to adequately predict both the quasi-static tensile and the compressive high strain rate response.KeywordsPolyurethaneDynamic mechanical analysisViscoelasticityViscoelastic damageHigh strain-rates

Highlights

The linear viscoelastic properties are first obtained from Dynamic mechanical analysis (DMA) experiments, which are integrated with quasistatic monotonic tests in compression to determine the phenomenological parameters for the damage model
The aim of this project is to investigate the whether the use of linear viscoelastic continuum damage theory in conventional mechanical experiments allows correlation between quasi-static and high strain rate tests
A specific viscoelastic damage model for the mechanical behaviour was used and, and when the phenomenological damage criteria were obtained from quasi-static compression experiments, this model was able to predict behaviour in compression at different rates and temperatures, tension and high rate compression

Summary

Introduction

Thermoplastic elastomers are widely used in engineering and industry, e.g. for bumpers, seals, moulded gaskets and ducts, often working as impact and vibration mitigators They benefit from advantageous properties such as flexibility, durability and property recovery after deformation, but simul taneously have dependence on polymer network morphology, temperature, strain rate and loading history [1–4]. At elevated temperature, the molecular chains have greater mobility owing to increased free volume and energy, and are able to respond on the loading timescale. This dynamic mechanism responds at low loading rates. Understanding the mechanical response of elastomers to applied deformation at different strain rates and temperatures is crucial in industrial design and manufacture; this response is often difficult to measure, especially at high strain rates (e.g. >100 s−1), and more predictive methods to obtain constitutive relationships are required

Methods

Results

Conclusion