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Stress Relaxation as Used in Underhood Component Design Verification
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English
Abstract
Bench testing is a critical step in the design verification process of underhood components. The challenge to the test engineer in developing a component test is to both simulate in-use conditions and to establish useful and measurable performance criteria.
The primary performance criteria for a sealing system, as in a rocker cover, is its ability to maintain a minimum sealing force necessary to prevent leakage. Compressive stress relaxation has been shown to be an important test for evaluating sealing materials and through the ASTM E-328 test method, a complete sealing system assembly can be evaluated.
A test system has been developed to measure compressive stress relaxation of actual components and component assemblies under a variety of environmental conditions. The system was used to verify the design of a rocker cover assembly for its ability to maintain a minimum sealing force under simulated engine operating conditions.
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Authors
Citation
Belchuk, M., "Stress Relaxation as Used in Underhood Component Design Verification," SAE Technical Paper 930090, 1993, https://doi.org/10.4271/930090.Also In
References
- ASTM D 2991 - 84 Standard Practice for Testing Stress-Relaxation of Plastics Annual Book of ASTM Standards 08.02 1989
- ISO 3384: 1991 (E) Rubber, Vulcanized or Thermoplastic - Determination of Stress Relaxation in Compression at Ambient and at Elevated Temperatures International Standards Organization 1991
- ASTM E 328 - 86 Standard Methods for Stress Relaxation Tests for Materials and Structures Annual Book of ASTM Standards 03.01 1989