Mechanical Performance Degradation of Naturally Aged Nitrile Butadiene Rubber in Low Frequency Range…

Open Access

Year : 2022 | Volume : | Issue : 1 | Page : 68-79

    Syam Prasad Amminen

  1. Ch. Nagaraju

  2. D. Linga Raju

  1. Research Scholar, Department of Mechanical Engineering, JNTUK, Kakinada, India
  2. Assistant Professor, Department of Mechanical Engineering, Maturi Venkata Subba Rao (MVSR) Engineering College, Telangana, India


For good mechanical design, damping is often still an invisible requirement. Nitrile Butadiene Rubber (NBR) has a wide range of applications as a damping and sealing material. To offer the long-term service of NBR, it is important to estimate the degradation of modal properties under complex mechanical and environmental loading. The present work aims to correlate the experimental data with generalized higher-order Maxwell models and curve fitting techniques to find the damping characteristics of NBR in low-frequency ranges with age. Nitrile Butadiene Rubber (NBR) is assumed to be homogeneous and isotropic, and it is allowed to age naturally in the oxidative environment with no load. Mechanical tests are performed to find hardness, true stress-strain behavior, and failure stress of virgin NBR and the naturally aged NBR. Deterioration of damping ability of NBR is studied by Dynamic Mechanical Analysis (DMA) tests to relate the complex properties of naturally aged material at an operating temperature of 40˚C, with virgin material in the frequency domain. The developed curve fitting techniques are well acceptable with experimental data and higher-order maxwell models. Relaxation modulus in shear mode is calculated for virgin and aged NBR. Based on experimental results, it has been observed that the Mechanical properties, such as yield strength, tensile strength, Elastic modulus are deteriorated with natural oxidative aging. Modal properties of NBR namely storage modulus by 52%, loss modulus by 66%, loss factor by 31%, relaxation modulus by 43.9%, and damping coefficient by 31.25%, as well as damping ability has deteriorated with age.

Keywords: Damping, DMA, Frequency, Maxwell model, NBR.

[This article belongs to Journal of Polymer and Composites(jopc)]

How to cite this article: Syam Prasad Amminen, Ch. Nagaraju, D. Linga Raju Mechanical Performance Degradation of Naturally Aged Nitrile Butadiene Rubber in Low Frequency Range… jopc 2022; 10:68-79
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Regular Issue Open Access Article
Volume 10
Issue 1
Received March 8, 2022
Accepted March 23, 2022
Published April 19, 2022