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Elastomer service life examined.

Service Life Prediction Symposium 2000, a two-day international symposium on advances in service life prediction techniques for rubber components, thermoplastic elastomers, rubber adhesive bonds and polymer composites, will take place October 3-4 at E.J. Thomas Hall, Akron, OH.

This symposoium is organized by Akron Rubber Development Laboratory, and co-sponsored by the University of Akron, College of Polymer Science and Polymer Engineering.

The objective of this symposium is to provide a technical forum to discuss various methodologies on service life prediction of polymer materials and components.

The symposium will provide an opportunity to focus on the service life aspect of polymer materials and to present the technical work in a more unified and focused manner, as well as to evaluate the current status of this field.

The symposium will address the trends and scientific challenges related to polymeric service life prediction, shelf life prediction and remaining useful life prediction.

Service life prediction of polymers is said to be receiving increasing attention due to the need for effective material utilization, reliability and durability. Durability of polymer components becomes important as polymers are increasingly used for critical and long-term engineering applications, according to the organizers.

A strategic OEM goal is said to be to avoid redundancy and periodic part replacement due to cost effectiveness and emerging environmental concerns. Therefore, service life prediction determination is said to be increasingly considered as an integral part of the engineering design process for polymer parts.

Service life issues, along with many other related subjects, will be addressed under the following topics: Materials (rubber, thermoplastics, engineering plastics, polymer coating, rubber adhesive bonds and polymer composites); Life prediction of polymer components; Accelerated aging techniques to simulate service aging; Quantitative assessment of degradation - monitoring by physical and chemical tests; Service life prediction models; Remaining useful life and shelf life prediction; Field and laboratory data correlation; and Failure mode and failure criteria.

The major emphasis of this symposium is on the practical aspect, rather than the theoretical aspect of service life prediction.

This two-day symposium on polymer life prediction techniques will be addressed by internationally recognized experts.

Speakers and preliminary topics will include: Dr. Stephen Clarson, University of Cincinnati, "Silicone rubber in long-term applications"; Dr. Gary Hamed, University of Akron, "Crack growth in reinforced natural rubber"; Ken Reifsnider, Virginia Tech, topic to be announced; Paul Westbrook, Shell Oil, topic to be announced; Daniel Hertz, Seals Eastern, "1,000 hours testing - is it capable of predicting long-term service life?"; Dr. Daniel De Kee, Tulane University, "Effect of contamination and stress on the permeation of organic liquids through rubber membranes"; Dr. Boris N. Dinzburg, Chicago Rawhide, topic to be announced; Dr. Sharon Guo, Bayer, "Polymer characterization for durability studies"; Dr. Ramanan Krishnamoorti, University of Houston, "Fluid compatibility of elastomers"; Dr. Clark Thomas, Ford Motor, "Sealing strategies for long-term automotive applications"; Richard Shepherd, MERL, "Testing equipment used for accelerated testing of elastomeric components"; and Igor Koravjchuk and Uday Karmarkar, ARDL Engineering Group, "Continuous compression stress relaxation."

Presentations on engineering polymer components will discuss o-rings, gaskets, expansion joints, shaft seals, belts, rubber hoses, isolation mounts, tires, automotive panels, bumper systems, flexible hose/ducts and rubber-metal bonds.

Discussions of accelerated aging and simulated service aging will examine long-term compression stress relaxation, crack growth propagation, wear and fatigue (compression, tension, shear and bending), ozone, oxidative and photodegradation, and fluid immersion and humidity.

Talks on the service life prediction approach will include an empirical approach, a viscoelastic molecular approach, an Arrhenius approach, a probabilistic statistical approach and a technique based on fracture mechanics.

Presentations on degradation monitoring tests will include physical tests (tensile, shear, compression and hardness), microhardness decay, dynamic property (MTS and DMA), swell or crosslink density, NMR, FTIR and GCMS, thermal analysis (DSC), weight loss (TGA), dielectric constant, specific gravity, friction coefficient and solubility parameter.

Discussions on other related issues will examine remaining useful life prediction (nondestructive testing), shelf life prediction, and failure mode and failure criteria.

Further information on the Service Life Prediction Symposium 2000 is available from Stan Sadon (330) 794-6600.
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Publication:Rubber World
Date:Sep 1, 2000
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