Influence of Damping on the Bending and Twisting Modes of Flax Fibre-reinforced Polypropylene Composite 


Vol. 19,  No. 2, pp. 375-382, Feb.  2018
10.1007/s12221-018-7588-7


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  Abstract

The effects of damping on the bending and twisting modes of flax fibre-reinforced polypropylene composites are investigated. The laminate was manufactured by a vacuum bagging process; its dynamic behaviour was then found from the vibration measurements of a beam test specimen using an impulse hammer technique to frequencies of 1 kHz. The frequency response of a sample was measured, and the bending and twisting responses at resonance were used to estimate the natural frequency and loss factor. The single-degree-of-freedom circle-fit method and Newton셲 divided differences formula were used to estimate the natural frequencies as well as the loss factors. The damping estimates were also investigated using a 쐁arpet plot. The results show significant variations in loss factors depending on the type of mode. The loss factor generally lies in the range of 1.7-2.2 % for the bending modes, while 4.8 % on average for the twisting modes. Numerical estimates of the response, and in particular the natural frequencies, were made using a Mechanical APDL (ANSYS parametric design language) finite element model, with the beam being discretised into a number of shell elements. The natural frequencies from the finite element analysis show reasonably good agreement (errors < 5 %) with the measured natural frequencies.

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  Cite this article

[IEEE Style]

M. Z. Rahman, K. Jayaraman, B. R. Mace, "Influence of Damping on the Bending and Twisting Modes of Flax Fibre-reinforced Polypropylene Composite," Fibers and Polymers, vol. 19, no. 2, pp. 375-382, 2018. DOI: 10.1007/s12221-018-7588-7.

[ACM Style]

Md Zillur Rahman, Krishnan Jayaraman, and Brian Richard Mace. 2018. Influence of Damping on the Bending and Twisting Modes of Flax Fibre-reinforced Polypropylene Composite. Fibers and Polymers, 19, 2, (2018), 375-382. DOI: 10.1007/s12221-018-7588-7.

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