Low-velocity impact on hybrid-composite beams reinforced by MWCNTs and bamboo natural fibers: Analytical,experimental,and numerical approaches

Abstract

Herein in this article, bamboo fibers (BFs) and multi-walled carbon nanotubes (MWCNTs) are selected as reinforcements and LR630 epoxy is considered as a resin to fabricate the bamboo fiber reinforced composites (BFRCs). Using the hand-layup technique, different BFRCs-MWCNTs are produced with the same overall fiber and varying MWCNTs with 0wt.%, 0.26wt.%, 0.52wt.%, and 0.78wt.%. The three-point bending and drop-weight impact tests are carried out on the BFRCs-MWCNTs. The analytical section utilizes the first-order shear deformation theory (FSDT) and partial fraction shear-strain function theory to introduce the field of beam displacements and Hertz’s nonlinear contact law in impact mechanics. The equations for impact motion are derived through the application of the energy method. The responses are validated by simulating the low-velocity impact process on the BFRCs-MWCNTs using ABAQUS finite element (FE) software, and then comparing it with the analytical and experimental methods. The results showed that the contact force was predicted more accurately by the partial fraction shear-strain function theory than by the FSDT. By changing the percentage of MWCNTs from 0% to 0.26% and 0.52%, the peak value of three-point bending force, impact force and Young’s modulus increases and also the contact time decreases. The BFRCs with 0.78% MWCNTs have experienced CNTs agglomeration phenomenon according to the Field Emission Scanning Electron Microscope (FE-SEM) pictures taken and have gone through a reverse process in the results. Finally, a new formulation for predicting Young’s modulus and maximum contact force of BFRCs-MWCNTs samples is presented.

Keywords

Bamboo fibers MWCNTs partial fraction shear-strain function theory three-point bending test drop-weight impact test FE-SEM images

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