Vibration Fatigue Study of Elastomeric Shear Mounts
Abstract
A method of measuring the fatigue life of elastomeric shear mounts was developed. It included vibration testing at resonance to failure at different inputs, and plotting the time to failure vs input displacement for each set of mounts tested. Twelve pairs of mounts composed of butadiene styrene elastomer were subjected to static load deflection and vibration testing. The nominal static spring rate of one mount was 470 pounds/in. The load deflections yielded results within 7% of this value. During initial vibration the transmissibility was found to vary between 3.1 and 4.4 and the resonant frequency between 8.4 and 9.2 Hz. Eleven pairs of mounts were fatigue-vibrated at double amplitudes of 1/86, 0.26, 1/ 6 and 1/26. The durations to failure were approximately four hours for 1/8 inch and five minutes for 1/2 inch. Five pairs of mounts were subjected to load deflection testing. The loss of static spring rate amounted to less than 15% for all five deflected up to 3 inches, and most cases it was less than 10%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1971
- Accession Number
- AD0720575
Entities
People
- Eugene Farrell
- Karl Jensen
Organizations
- Picatinny Arsenal