Browse Publications Technical Papers 2000-01-0753
2000-03-06

New Continuous Compression Stress Relaxation Test for Evaluation of Sealant Materials in Cyclic Temperature Environments 2000-01-0753

A new continuous compression stress relaxation test method has been developed for evaluating elastomeric materials for sealing applications. During a test, the elastomer component is compressed at various strain levels under precise displacement control. The sealing force is recorded continuously at a finite time interval. The test can be performed over a large temperature range - 40°C<T<150°C, and in various environments (air, coolant and oil). The reproducibility of the method has been evaluated on similar types of testing equipment. This measurement technique is capable of simulating the real sealing conditions, and thus is more suitable for diagnosing the real seal failure.
The stress decay of sealant materials has been modeled using finite element method (FEM) for both constant and cyclic temperature conditions. The time-dependent elastic behavior of sealant materials is modeled using the finite-strain viscoelasticity theory. The stress relaxation results from FEA are consistent with the experimental measurements.

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