A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants

Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page

Volume 11, Issue 4 (July 1983)

Click here to download this paper now for $25 PDF (184K)

View License Agreement

ISSN: 0090-3973
Page Count: 5

A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants
Kearsley, EA
president, Rheology Research, MD

Abstract

The failure of sealants aging in geothermal downwell atmospheres is usually a result of the cumulative effects of both the forming of cross-links and their destruction in the rubbery sealant materials. Methods are discussed to distinguish between these mechanisms using measurement of stress relaxation and permanent set. Some data on oxidative aging of natural rubber are recalled as a paradigm of chemically degrading elastomers and some simple scaling laws are described which (when they can be established) are useful for predicting longtime behavior from short-time tests.

Keywords:
aging tests (materials), degradation, sealers, rubber, elastomers, geothermal, hydrolysis, permanent set, stress relaxation

Paper ID: JTE10293J
DOI: 10.1520/JTE10293J
ASTM International is a member of CrossRef.

Author Title A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants Symposium , 0000-00-00 Committee D20

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 11, Issue 4 (July 1983) Click here to download this paper now for $25 PDF (184K) View License Agreement ISSN: 0090-3973 Page Count: 5 A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants Kearsley, EA president, Rheology Research, MD Abstract The failure of sealants aging in geothermal downwell atmospheres is usually a result of the cumulative effects of both the forming of cross-links and their destruction in the rubbery sealant materials. Methods are discussed to distinguish between these mechanisms using measurement of stress relaxation and permanent set. Some data on oxidative aging of natural rubber are recalled as a paradigm of chemically degrading elastomers and some simple scaling laws are described which (when they can be established) are useful for predicting longtime behavior from short-time tests. Keywords: aging tests (materials), degradation, sealers, rubber, elastomers, geothermal, hydrolysis, permanent set, stress relaxation Paper ID: JTE10293J DOI: 10.1520/JTE10293J ASTM International is a member of CrossRef. Author Title A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants Symposium , 0000-00-00 Committee D20