Dynamic behaviour of biocomposites

Muhammad Hakim, Ahmad Suhaimi (2016) Dynamic behaviour of biocomposites. Project Report. UTeM, Melaka,Malaysia. (Submitted)

Text (24 Pages) Dynamic behaviour of biocomposites.pdf - Submitted Version Download (2MB)

Abstract

This research project focuses on the dynamic behavior of pineapple leaf fiber reinforced polylactid acid biocomposites,with limited resources currently available in the literature.In terms of fabrication of the biocomposites,the pineapple leaf fibre was pre-treated with natrium hydroxide prior to fabrication of the composite via a compression moulding process,with the aim to improve adhesion between the fibres and the matrix,leading to enhancement in the mechanical properties of the biocomposites.This research project considered both quasi static and dynamic loading condition.The quasi static indentation test was run using an Instron 5585 model Universal Testing Machine at crosshead displacement rate of 1 mm/min and 2 mm/min,simply supported in between the two support using a hemispherical steel indentor and centrally loaded during testing.As for the dynamic loading condition, an Instron Dynatup model 9250 HV dropweight impact test was used to conduct a low velocity impact test using a 10 mm diameter hemispherical steel indentor,simply supported and impacted at the centre of the square-sided test specimens with dimensions of 50 mm x 50 mm x 3 mm,using impact velocities of 1 m/s,1.5 m/s, 2 m/s,2.5 m/s,3 m/s and 3.5 m/s.From the experimental results obtained from quasi static indentation test,it was observed that the specimens exhibit much higher maximum force and maximum stress,with the values of 2713.74 ±38.07 N and 36.19 ± 0.51 MPa, respectively when subjected to 1 mm/min,in comparison to that of the test results obtained for the 2 mm/min crosshead displacement rate.The corresponding damage for all the specimens can be classified as barely visible, limited to the contact loading radius.Meanwhile,as for the dynamic behaviour of the composites,from a series of dropweight impact test at impact velocities between 1 - 3.5 m/s,it was found that the maximum force increased with increasing impact velocity, from 1 to 2.5 m/s,with the highest value obtained at this impact velocity,From this point,there is a decrease in the maximum force when subjected to 3 m/s and 3.5 m/s.These observations can be correlated with the failure mechanism or damage mechanism present in the composite system.From visual observations on the specimens as well as morphological study via Scanning Electron Microscopy (SEM),it was found that the specimens underwent higher degree of damage when subjected to the dynamic loading conditions at different impact velocities. Cleary,significant damage is found starting from impact velocity of 1.5 m/s,as evident in the images captured.

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