North America

Green Room - Session 4

10:30 to 11:30 a.m. Wednesday, June 14, 2017

Accelerated Thermal Aging of EPDM Rubber Components to Analyze Age-Related Changes in Vibration Damping Performance

In mechanical assemblies, dynamic vibrations are often absorbed with the use of rubber insulators between components and mounting points. In a dynamic system, components may be mounted on damping devices so vibrational movements can be separated from the rigid structures. Vibrations can cause unwanted noise and structural failure over time. A common material used to form damping components is ethylene propylene diene monomer rubber, better known as EPDM. Components made of EPDM rubber can be designed in many configurations and have multiple types of load cases. One environmental parameter that affects the ability of EPDM to absorb vibration energy is saturation temperature. Damping components that are exposed to higher thermal temperatures for long periods of time may experience changes in their ability to absorb energy. This presentation will explore the changes in mechanical properties of the material due to heat aging and how the changes affect the damping ability of a component. Stress-Strength and degradation modeling will show the effects vs. time. Based on the results we can better understand a product's life expectancy and if it will meet long-term reliability goals for the functional requirements of damping vibrations.

Key Words: Reliability Projections for Performance of EPDM Damping Components vs. Time, Changes in a Component’s Natural Frequency Due to Thermal Aging, Changes in Damping Ability vs. Time and Thermal Exposure, Degradation Modeling, Key Reliability Characteristics of EPDM Rubber

Gregory Ruhlander

Lennox International

Carrollton, Texas