Volume 19, Issue 10 (October 2019)                   Modares Mechanical Engineering 2019, 19(10): 2571-2579 | Back to browse issues page

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Imani F, Jahani K. Experimental Identification of Mechanical and Damping Properties of a Viscoelastic Material Using the Relaxation Test. Modares Mechanical Engineering 2019; 19 (10) :2571-2579
URL: http://mme.modares.ac.ir/article-15-24346-en.html
1- 1Mechanical Engineering Department, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
2- 1Mechanical Engineering Department, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran , ka_jahani@tabrizu.ac.ir
Abstract:   (2586 Views)
This study aims to extract the dynamic parameters of a viscoelastic material sample. The mechanical model considered for material is the standard linear solid model. To extract the parameters of the model, first, a sample of the polymer was made. Then, it was subjected to a constant initial value and pressure were measured over time. Then, using the governing relations of the standard linear solid model, by comparing theoretical and experimental relaxation functions, the dynamic properties of the material, such as storage and loss modulus, and its damping property in terms of frequency. To investigate the effects of time passing on the dynamic mechanical properties of the material, the studies were repeated at a different time, which was ten times more than the first study. Also, the effects of constant strain amplitude on the dynamic mechanical properties and damping characteristic of the sample were investigated with three different levels of strain. These values the relaxation function in the first test for the displacement of 2 mm were E(0)=523177.2 N/m2  and after 70 days this value was equivalent to E(0)=666060.8 N/m2. In the same test, the values of the relaxation function for the first test are equivalent to E()=458717.9 N/m2 and in the second test, the value is E (∞)=573029.7 N/m2 Also, the results show that, in smaller constant strains, the efficacy of the material is greater in energy dissipation. In addition, the intrinsic parameter of the Young Modulus is obtained in the experimental estimate of 0.89 MPa.
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Article Type: Original Research | Subject: Aerospace Structures
Received: 2018/08/21 | Accepted: 2019/05/21 | Published: 2019/10/22

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