Description of fatigue damage in carbon black filled natural rubber

J.‐B Le Cam,E Verron,B Huneau

doi:10.1111/j.1460-2695.2008.01293.x

J.‐B Le Cam, E Verron + Show 1 more

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https://doi.org/10.1111/j.1460-2695.2008.01293.x

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Abstract

ABSTRACTThe present paper describes macroscopic fatigue damage in carbon black‐filled natural rubber (CB‐NR) under uniaxial loading conditions. Uniaxial tension‐compression, fully relaxing uniaxial tension and non‐relaxing uniaxial tension loading conditions were applied until sample failure. Results, summarized in a Haigh‐like diagram, show that only one type of fatigue damage is observed for uniaxial tension‐compression and fully relaxing uniaxial tension loading conditions, and that several different types of fatigue damage take place in non‐relaxing uniaxial tension loading conditions. The different damage types observed under non‐relaxing uniaxial tension, loading conditions are closely related to the improvement of rubber fatigue life. Therefore, as fatigue life improvement is classically supposed to be due to strain‐induced crystallization (SIC), a similar conclusion can be drawn for the occurrence of different types of fatigue damage.

Highlights

Elastomers are extensively used in industrial applications because of their large elastic deformation and great damping capabilities
Results, summarized in a Haigh-like diagram, show that only one type of fatigue damage is observed for uniaxial tension-compression and fully relaxing uniaxial tension loading conditions, and that several different types of fatigue damage take place in non-relaxing uniaxial tension loading conditions
Fatigue damage type 2 : Sample failure is due to internal cracking below the metallic insert located on the side of the injection point

Summary

Introduction

Elastomers are extensively used in industrial applications because of their large elastic deformation and great damping capabilities. Cadwell et al.[1] proposed the first published study in which the surprising response of crystallisable elastomers was highlighted: authors show that natural rubber exhibits an improvement of its fatigue life under non-relaxing uniaxial tension loading conditions, i.e. without complete unloading of the sample during fatigue tests.

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