The Effect Of Strain Rates On The Fracture Behaviour Of Biocomposites

Yahaya , Nur Yuzatul Aqilah (2016) The Effect Of Strain Rates On The Fracture Behaviour Of Biocomposites. Project Report. UTeM, Melaka,Malaysia. (Submitted)

Text The effect of strain rates on the fracture behaviour of biocomposites.pdf Download (2MB)

Abstract

In this study,impact performance of biocomposites fabricated from pineapple leaf fibre (PALF) and polylactic (PLA) subjected to quasi-static indentation and low velocity impact loading were presented.In terms of fabrication of the biocomposites,the pineapple leaf fibre was pre-treated with sodium hydroxide with the aim to improve adhesion between the fibres and the matrix and the composite laminates were fabricated using hot compression moulding technique.The quasi static indentation was run by using an Instron 5585 model Universal Testing Machine at crosshead displacement rate of 1 mm/min and 2 mm/min.Meanwhile for dynamic loading condition,an lnstron Dynatup model 9250 HV dropweight impact was used to a low velocity impact test at impact velocities of 1 m/s,1.5 /s,2 m/s,2.5 m/s,3 m/s,and 3.5 m/s.The impact response due to different velocity were investigated and the experimental observations were reported.From the results obtained from quasi static indentation test,it was observed that the deformation of the fibre have significant influence due to the crosshead displacement rate on PLA/PALF composite material.The result show that the maximum peak load,and maximum stress of 1 mm/min is higher compared to 2 mm/min.The corresponding damage for all the specimens are barely visible and limited to the contact loading radius. Meanwhile for dynamic behavior on biocomposites,the maximum load and total energy absorbed increase linearly with an increase of velocity. 2.5 m/s velocity has higher maximum load and total absorbed energy compared to other velocity.This was attributed to the fibre wettability, alignment and location of the indenter effect which creates the cross-over points which act as stress distributor.

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