Abstract
A low cost experimental setup has been fabricated for evaluation of vibration damping properties of a variety of elastomers developed from linseed oil. Free and forced vibration principles were utilized in this experimental setup. Under forced vibration, the shear loss factor varies from 0.37 to 1.03 at 2nd bending vibration mode and 0.43 to 0.99 at 3rd bending vibration mode for different elastomers. The loss factor varies from 0.52 to 0.94 under free vibration. The loss factors determined by both forced and free vibration techniques are in good agreement with the loss factors obtained from dynamic mechanical analysis. The ultimate tensile strength and Young’s modulus of the elastomers vary from 0.37 to 3.71 MPa and 0.27 to 10.27 MPa, respectively, whereas these properties in compression are in the range of 3.1 to 72.9 MPa and 1.5 to 30.1 MPa, respectively. Thus, these elastomers are mechanically stable for vibration damping applications.
Highlights
Most geometric structures and machine elements experience vibratory motion during service or operation
The vibration damping properties of the elastomers developed from linseed oil have been characterized by this setup
From forced vibration damping testing results, it is observed that the shear loss factor of the elastomers are in range of 0.37 to 1.03 at 2nd bending vibration mode and 0.43 to 0.99 at 3rd bending vibration mode
Summary
Most geometric structures and machine elements experience vibratory motion during service or operation. In a previous study [21], we developed vibration damping elastomers from linseed oil, most abundant and cheap non edible oil among different natural oil [22] These elastomers were characterized through the dynamic mechanical analyzer in a wide temperature and frequency range. Several methods using the vibration response of test piece under free or forced vibration conditions [25, 26] and a modified Oberst beam technique [27] are available to determine the damping loss factor. A comparison of different test methods for measuring vibration damping properties of materials has been reported [28] In this experiment free and forced vibration principle are utilized. The significant parameters like Young’s modulus, compressive yield strength, ultimate compressive strength, compression at break, and toughness are analyzed
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