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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 l.jpg

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 l.jpg

Available at: www.axelproducts.com.


Overview l.jpg

Overview

  • Elastomer Seals

  • Stress, Strain and Temperature

  • A Particular Experiment


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Elastomer Seals

  • Normally Compressed

  • Fill a Space

  • Provide a Reaction Force

  • Survive Temperature Changes

  • Survive Chemical Attack


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Stress, Strain and Temperature

  • Mental Experiment

  • Actual Experiment


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Stress, Strain and Temperature


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Stress, Strain and Temperature

  • Short Term Stress Relaxation

  • Some Softening


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Stress, Strain and Temperature


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Stress, Strain and Temperature

  • Thermal Expansion

    • Elastomer > Steel

  • Thermal Softening

  • Thermal Degradation

  • Additional Crosslinking


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Stress, Strain and Temperature

  • Thermal Expansion vs Thermal Softening


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Stress, Strain and Temperature

  • NOT Long Term Stress Relaxation


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Stress, Strain and Temperature


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Stress, Strain and Temperature

  • Thermal Contraction

  • Reduced Reaction Force


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Stress, Strain and Temperature


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Stress, Strain and Temperature

  • Additional Thermal Contraction

  • Reduced or Possible Loss of Reaction Force

  • The Seal May go into Tension!


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A Particular Experiment


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A Particular Experiment


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A Particular Experiment

  • Example Data, Constrained Seal


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A Particular Experiment

  • Example Data, Constrained Seal


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A Particular Experiment

  • This does not replace aging experiments.


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A Particular Experiment

  • This does not replace aging experiments.


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A Particular Experiment

  • This does not replace:

    • Thermal Expansion by TMA

    • Compression Set


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Overview

  • Bad Things Happen When Hot,

    Become Evident When Cold

  • Experimental data is Helpful


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