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Experimental Considerations in the Measurement of Thermal Relaxation and Recovery of Strained Seals PowerPoint PPT Presentation


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Experimental Considerations in the Measurement of Thermal Relaxation and Recovery of Strained Seals. Kurt Miller Axel Products, Inc. www.axelproducts.com. Available at: www.axelproducts.com. Overview. Elastomer Seals Stress, Strain and Temperature A Particular Experiment.

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Experimental Considerations in the Measurement of Thermal Relaxation and Recovery of Strained Seals

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Experimental Considerations in the Measurement of Thermal Relaxation and Recovery of Strained Seals

Kurt Miller

Axel Products, Inc.

www.axelproducts.com


Available at: www.axelproducts.com.


Overview

  • Elastomer Seals

  • Stress, Strain and Temperature

  • A Particular Experiment


Elastomer Seals

  • Normally Compressed

  • Fill a Space

  • Provide a Reaction Force

  • Survive Temperature Changes

  • Survive Chemical Attack


Stress, Strain and Temperature

  • Mental Experiment

  • Actual Experiment


Stress, Strain and Temperature


Stress, Strain and Temperature

  • Short Term Stress Relaxation

  • Some Softening


Stress, Strain and Temperature


Stress, Strain and Temperature

  • Thermal Expansion

    • Elastomer > Steel

  • Thermal Softening

  • Thermal Degradation

  • Additional Crosslinking


Stress, Strain and Temperature

  • Thermal Expansion vs Thermal Softening


Stress, Strain and Temperature

  • NOT Long Term Stress Relaxation


Stress, Strain and Temperature


Stress, Strain and Temperature

  • Thermal Contraction

  • Reduced Reaction Force


Stress, Strain and Temperature


Stress, Strain and Temperature

  • Additional Thermal Contraction

  • Reduced or Possible Loss of Reaction Force

  • The Seal May go into Tension!


A Particular Experiment


A Particular Experiment


A Particular Experiment

  • Example Data, Constrained Seal


A Particular Experiment

  • Example Data, Constrained Seal


A Particular Experiment

  • This does not replace aging experiments.


A Particular Experiment

  • This does not replace aging experiments.


A Particular Experiment

  • This does not replace:

    • Thermal Expansion by TMA

    • Compression Set


Overview

  • Bad Things Happen When Hot,

    Become Evident When Cold

  • Experimental data is Helpful


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