Meaning
Standardized evaluation procedures quantify the force decay of elastomeric seals under constant compressive strain. The protocol known as astm d6147 measures how much a gasket relaxes over time when held at a specific thickness. Stress relaxation values are necessary for determining the long term seal integrity in battery enclosures.
This data allows designers to select materials that will prevent moisture ingress throughout the pack life.
Material Evaluation
Physical properties of polymers change when they are held in a compressed state for hundreds of hours. Testing according to astm d6147 involves placing a sample between two plates and monitoring the force exerted by the material as it resists the deformation. A high rate of relaxation indicates the seal might fail to provide enough pressure against the housing over years of use.
This information helps in choosing silicones or epoxies that maintain their elasticity.
Testing Precision
Measurement accuracy depends on the stability of the temperature and the sensitivity of the load cell used during the run. Because relaxation happens faster at high temperatures, the environment must stay within a fraction of a degree. A standard laboratory setup uses automated data logging to capture the decay curve over a period of weeks or months.
This curve shows the transition from initial elastic response to long term viscous flow. Analyzing the slope of this curve provides the primary metric for material longevity. High quality instrumentation ensures that the recorded force reflects the true internal state of the elastomer.
Application Scope
The method stops at the measurement of force and does not predict the chemical compatibility of the seal with electrolytes. It is a mechanical benchmark for how well a material stays energized under load. Combining this result with chemical swell tests forms a complete picture of gasket reliability.
Reliable sealing prevents the leakage of flammable gases or the entry of humid air.
