New method for predicting lifetime of seals from compression-stress relaxation experiments Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title New method for predicting lifetime of seals from compression-stress relaxation experiments

Creator

  • Author: Gillen, K.T.
    Creator Type: Personal
  • Author: Keenan, M.R.
    Creator Type: Personal
  • Author: Wise, J.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Sandia National Laboratories
    Place of Publication: Albuquerque, New Mexico
    Additional Info: Sandia National Labs., Albuquerque, NM (United States)

Date

  • Creation: 1998-06-01

Language

  • English

Description

  • Content Description: Interpretation of compression stress-relaxation (CSR) experiments for elastomers in air is complicated by (1) the presence of both physical and chemical relaxation and (2) anomalous diffusion-limited oxidation (DLO) effects. For a butyl material, the authors first use shear relaxation data to indicate that physical relaxation effects are negligible during typical high temperature CSR experiments. They then show that experiments on standard CSR samples ({approximately}15 mm diameter when compressed) lead to complex non-Arrhenius behavior. By combining reaction kinetics based on the historic basic autoxidation scheme with a diffusion equation appropriate to disk-shaped samples, they derive a theoretical DLO model appropriate to CSR experiments. Using oxygen consumption and permeation rate measurements, the theory shows that important DLO effects are responsible for the observed non-Arrhenius behavior. To minimize DLO effects, they introduce a new CSR methodology based on the use of numerous small disk samples strained in parallel. Results from these parallel, minidisk experiments lead to Arrhenius behavior with an activation energy consistent with values commonly observed for elastomers, allowing more confident extrapolated predictions. In addition, excellent correlation is noted between the CSR force decay and the oxygen consumption rate, consistent with the expectation that oxidative scission processes dominate the CSR results.
  • Physical Description: 32 p.

Subject

  • Keyword: Diffusion
  • Keyword: Experimental Data
  • Keyword: Oxidation
  • Keyword: Seals
  • Keyword: Mathematical Models
  • Keyword: Stress Relaxation
  • Keyword: Elastomers
  • Keyword: Compression Strength
  • Keyword: Service Life
  • STI Subject Categories: 42 Engineering Not Included In Other Categories

Source

  • Conference: 20. international conference on advances in the stabilization and controlled degradation of polymers, Lucerne (Switzerland), 12-14 Jun 1998

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE98004528
  • Report No.: SAND--98-0854C
  • Report No.: CONF-980642--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/672100
  • Office of Scientific & Technical Information Report Number: 672100
  • Archival Resource Key: ark:/67531/metadc710623

Note

  • Display Note: OSTI as DE98004528