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

Volume 11, Issue 4 (July 1983)

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ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 5

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

Kearsley, EA
presidentMember of ASTM, Rheology Research, Gaithersburg, 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

		SEDL / 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 (176K) View License Agreement ISSN: 1945-7553 CODEN: JTEVAB Page Count: 5 A Basis for Predicting Longtime Behavior from Short-Time Tests of Geothermal Sealants Kearsley, EA presidentMember of ASTM, Rheology Research, Gaithersburg, 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