%0 Journal Article
%T Damping Evaluation of Linseed Oil-Based Engineering Elastomers by Vibration Response Method
%A Rakesh Das
%A Rajesh Kumar
%A P. P. Kundu
%J ISRN Polymer Science
%D 2014
%R 10.1155/2014/840397
%X 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. 1. Introduction Most geometric structures and machine elements experience vibratory motion during service or operation. The unwanted vibrations result in fatigue and finally failure of structures, which inevitably cost industries in maintenance, repair, and replacement. Therefore vibration control is a serious engineering challenge. Generally vibration control is achieved by either passive or active damping [1¨C3]. Passive vibration control involves the modification of stiffness and mass of the vibrating system to make the system less responsive to its vibrating environment. During passive damping treatments, the straightforward solution is the application of materials having high vibration damping capacity, whereas active damping is attained through sensing and activation to suppress the vibration in real time using sensors and actuators, which can be piezoelectric devices [4¨C6]. During passive damping treatments, elastomers are the most effective and widely used materials due to their unique combination of low modulus and inherent damping properties [7]. Apart from this, many researchers developed polymeric materials like polymer blend and interpenetrating polymer network (IPN) as high performance damping materials [8, 9]. Natural oils are versatile renewable resources for producing functional polymeric materials [10¨C15] because of their low production cost, universal availability, and biodegradability in nature [16, 17]. Li and Larock [18] synthesized cationic polymeric materials having good damping behavior of soybean oil and reported the response of damping behavior in the lower frequency range (1¨C35£¿Hz). Also
%U http://www.hindawi.com/journals/isrn.polymer.science/2014/840397/