Study of Hexagonal Boron Nitride Particulate as Vibration Behaviour Modifier of Alternate Stacked Glass–Natural Fibre Polymer Composite Laminate

Abstract

The vibration behaviour of polymers can be modified by the particulates and natural fibres which are interesting study to the design engineers. A study has been carried out to investigate the tensile, flexural and vibrational behaviour of vinyl ester composites reinforcing with woven kenaf and glass fibres. Vibration behaviour of composite was further enhanced by the addition of hexagonal boron nitride (2&4% hBN) particles. The fibres were chemically treated to improve its adhesion to matrix. The tensile strength of fabricated composites was marginally reduced with increase in hBN particles. The vibration behaviours of composite were studied by electro-dynamic shaker. The experimental results were clearly showed that natural frequency of composite decreases with increasing particulate content. The hBN particles inclusion in the treated kenaf laminate has increased damping ratio by dissipating by more local vibration energy. This is due to combined effect of chemical treatment of fibre and local relaxing behaviour of secondary hBN particles. The two fold increase in damping ratio obtained by adding four times of hBN particle. Dynamic mechanical tests proved that hBN, a secondary particle, is improving vibration damping characteristics. Hence, it potentially benefits the composite as an engineered material.