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Designing with Elastomers for use at Low Temperatures, Near or Below Glass Transition
- Aerospace Standard
Published January 15, 2016 by SAE International in United States
Downloadable datasets availableAnnotation ability available
To ensure success in design of elastomeric parts for use at low temperature, the design engineer must understand the peculiar properties of rubber materials at these temperatures.
There are no static applications of rubber. The Gaussian theory of rubber elasticity demonstrates that the elastic characteristic of rubber is due to approximately 15% internal energy and the balance, 85%, is entropy change. In other words, when an elastomer is deformed, the elastomer chain network is forced to rearrange its configuration thereby storing energy through entropy change. Thermodynamically, this means that rubber elasticity is time and temperature dependent (Reference 25).
The purpose of this report is to provide guidance on low temperature properties of rubber with the terminology, test methods, and mathematical models applicable to rubber, and to present some practical experience. In this way, it is hoped that mistakes can be avoided, particularly in selection of rubber materials, enabling the design engineer to weigh low-temperature material properties together with the many other factors involved in the design process.
AIR1387C is now due for review. The template has been revised to meet the document standards of SAE. The addition of glass transition (Tg) and temperature retraction tables, new low temperature hydrocarbon and fluorocarbon elastomers, and new test methods to characterize low temperature properties of elastomers has been made to the last revision.
|Aerospace Standard||Clamps, Support, Comparative Fatigue Strengths, Test Method|
|Aerospace Standard||Designing for Long Life with Elastomers|
|Aerospace Standard||Age Controls for Hose Containing Age-Sensitive Elastomeric Material|
Data Sets - Support Documents
|Table 1||Typical glass transition temperature ranges|
|Table 2||Crystallizable elastomers|
|Table 3||Typical temperature retraction values|
Welcome to the AMS-CE Elastomers Committee Discussion Forum.The AMS-CE Elastomers Committee maintains Aerospace Materials Specifications (AMS), Aerospace Recommended Practices (ARP), Aerospace Information Reports (AIR) and Aerospace Standards (AS) on elastomeric materials. AMS-CE, which reports to the Aerospace Materials Division, coordinates and maintains liaison with industry, government and other standardization groups on elastomeric materials. A significant part of this committee is concerned with elastomeric fluid sealing materials, their applications, material development, testing, quality, design parameters and design practices. No copyrighted material may be posted in this forum. SAE is not liable for opinions expressed or information posted to this forum. All information posted becomes the property of SAE.
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