EXPERIMENTAL STUDYING OF MECHANICAL-AND- PHYSICAL PROPERTIES OF RUBBER DURING AGEING

Svetlana Polukoshko, Andris Martinovs, Edgars Zaicevs

Abstract


Elastomeric materials, both natural rubber and synthetic, are widely used in industry and civil engineering, due to their unique properties: high elasticity, low volume compressibility, capability to absorb and dissipate input energy, a linear relationship between stress and strain up to strain of 15% ÷ 20%, resistance to aggressive environmental factors. Different kind of compensation devices, vibration dampers, shock absorbers are fabricated from rubber materials.

At the same time the elastomeric materials nonreversible change their properties over time, this disadvantage is called ageing.

In given paper the results of experimental studying of the influence of aging on the physical-and-mechanical properties of polyurethane rubber is presented. The samples of cylindrical form were prepared from soft flexible polyurethane rubber Xenias PX30 and subjected to the artificial ageing. Accelerated aging of samples was fulfilled in accordance with European standard ISO 188:2011 (Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests).

The changing of volume, Shore A hardness, elastic rebound coefficient and static elasticity modulus under compression were investigated. Experiments showed the volume decrease, hardness shore increasing, elastic rebound increase and compression modulus under static loading increasing. This data are necessary for correct designing of the compensation devices to provide their working properties during all service life.

 


Keywords


accelerated ageing; elastomers; hardness; compression static loading; stiffness

Full Text:

PDF

References


A. N. Gent, Engineering with Rubber: How to Design Rubber Components. Munich, Carl Hanser Verlag, 2011.

Brown R. P., Bulter T. and Hawely S.W. Ageing of Rubber: Acceleration Heat Ageing Test Results, Smither Rapra Publishing, 2001. Available: https://epdf.tips/ageing-of-rubber-accelerated-heat-ageing-test-results.html

Reincke et. all, “Experimental characterization of the ageingr esistanse of elastomers”, in: Constitutive Models for Rubber IX, Marvalova & Petrikova, Ed. Taylor & Francis Group, London, UK, 2015, pp. 33-37.

A, Martinovs, "Mechanical properties of elastomers forecasting and principles of accelerated experiment," D.S. thesis, Riga Technical University, Riga, EU, Latvija, 2005.

ISO 188:2011* Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests.

ISO 11346 Rubber, vulcanized or thermoplastic - Estimation of life-time and maximum temperature of use.

ISO/TR 9272 Rubber and rubber products - Determination of precision for test method standards

ISO 37:2017(E) Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties.

ISO 23529: 2010 Rubber — General procedures for preparing and conditioning test pieces for physical test methods.

ISO 18899:2013, Rubber — Guide to the calibration of test equipment.

DIN 53508: 2000. Prüfung von Kautschuk und Elastomeren. Künstliche Alterung. Testing of rubber and elastomers. Artificial ageing of rubber. ISO 18899:2004,

DIN 53505:2000. Prüfung von Kautschuk und Elastomeren. Härteprüfung nach Shore A und Shore D. Testing of rubber - Shore A and Shore D hardness test.

ISO 48-4:2018 Rubber, vulcanized or thermoplastic -- Determination of hardness -- Part 4: Indentation hardness by durometer method (Shore hardness).

DIN 53512: 2000 Determining the rebound resilience of rubber using the Schob pendulum.

S. Polukoshko, V. Gonca, A. Martinovs, S. Sokolova, “Boundary conditions influence on compressive stiffness of elastomeric isolators”, Proceedings of the 15-th international scientific conference Engineering for Rural Development 2016, Volume 15 May 25-27, 2016, Jelgava, p. 924-931. Available: http://www.tf.llu.lv/conference/proceedings2016/Papers/N137.pdf

S. Polukoshko, A. Martinovs, S. Sokolova. “Aging, Fatigue and Durability of Rubber Vibration Isolation Elements.” Proceeding of the 11th International Scientific and Practical Conference “Environment. Technology. Resources.”, Volume III, pp. 269-275.

S. Polukoshko, A. Martinovs, E. Zaicevs, “Influence of rubber ageing on damping capacity of rubber vibration absorber”, in: Vibroengineering PROCEDIA, September 2019, Volume 19, pp. 103-109.

Martinovs A., Polukoshko S., Apeinans E., Zaicevs E. “Determination constants of 4-element rheological model with rebound resilience method.” Proceedings of the 16-th international scientific conference Engineering for Rural Development 2017, Volume 16 May 24-26, 2017, Jelgava, p. 924-931.Available: http://tf.llu.lv/conference/proceedings2017/Papers/N189.pdf




DOI: http://dx.doi.org/10.17770/etr2019vol3.4200

Refbacks

  • There are currently no refbacks.


SCImago Journal & Country Rank