Characterization of Engine Mount Elastomers


  1. Szabo, J.P.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
As part of a project to develop methods for modelling the performance of engine mounts, several oil resistant alternative materials were prepared, and compared to conventional materials from mounts that are currently in service on the Canadian Patrol Frigate (CPF). This report describes the preparation and characterization of these elastomers, including two that were prepared at Platform Sciences Laboratory (PSL) in Melbourne, Australia under the Canada/ Australia MOU on Defence Science and Technology, Subsidiary Arrangement No. 16, Vibration Isolation Materials For Naval Vessels. The dynamic mechanical properties of the elastomers were determined as a function of frequency and strain amplitude. At strain amplitudes > 400 ìm, the storage moduli were generally independent of amplitude, once the moduli were corrected for changes in sample cross-sectional area resulting from tensile pre-strain. The storage moduli at 1 Hz, 20oC were in the range 3-7 MPa. The loss factors of the elastomers at 1 Hz, 20oC varied considerably, from 0.02 for natural rubber to 0.27 for ethylene acrylic elastomer. Swelling experiments of the elastomers in diesel fuel and lubricating oil demonstrated that the two elastomers prepared by PSL were in fact quite resistant to hydrocarbons. However, the hydrocarbon compatibility data for nitrile rubber/ plasticized PVC blend suggest that some plasticizer leaching occurred on exposure to lubricating oil. The frequency-dependent dynamic mechanical properties of

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dynamic mechanical properties;Engine mounts;Dynamic mechanical analysis
Report Number
DRDC-ATLANTIC-TM-2004-275 — Technical Memorandum
Date of publication
01 Feb 2005
Number of Pages

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