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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
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Available at: www.axelproducts.com.
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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