TY - JOUR
T1 - Energy absorption and self-sensing performance of 3D printed CF/PEEK cellular composites
AU - Andrew, J. Jefferson
AU - Alhashmi, Hasan
AU - Schiffer, Andreas
AU - Kumar, S.
AU - Deshpande, Vikram S.
N1 - Funding Information:
SK would like to thank the University of Glasgow for the start-up grant [award no: 144690-01]. Authors would like to acknowledge the funding provided by Khalifa University through the Competitive Internal Research Award (CIRA) [grant number: CIRA-2018-128]. Authors thank Mr. Johannes Schneider, University of Glasgow for his help in creating videos, and Mr. Pradeep George, Khalifa University for assisting with the micro-CT scans.
Publisher Copyright:
© 2021 The Authors
PY - 2021/10
Y1 - 2021/10
N2 - We report the energy absorption and piezoresistive self-sensing performance of 3D printed discontinuous carbon fiber (CF)-reinforced polyetheretherketone (PEEK) cellular composites. Experiments conducted on three different 2D lattices with hexagonal, chiral and re-entrant topologies of the same relative density (33%) and CF loading (30 wt%) reveal that the CF/PEEK hexagonal lattice (HL), due its relatively brittle response, shows about 40% and 9% decrease in specific energy absorption (SEA) under in-plane and out-of-plane compression, respectively, compared with PEEK HL. While the collapse response of PEEK HL is nearly insensitive to the strain-rate over 43 ≤ ε̇ ≤ 106 s−1, we observe a twenty-fold increase in peak stress and a five-fold increase in SEA under in-plane impact loading over the same range of strain-rates for the CF/PEEK HL. The CF/PEEK lattices exhibit pronounced piezoresistive response under both in-plane and out-of-plane compression with maximum sensitivity of 3.1 and 5.2, respectively, for the re-entrant lattice, offering insight into the damage-state. Higher damage sensitivity indicates faster percolation of new contacts due to folds forming between the cell walls within the lattice under compression. The energy-absorbing and strain- and damage-sensing nature of 3D printed CF/PEEK lattices demonstrated here offers insight into the design of lightweight, high-performance multifunctional lattices.
AB - We report the energy absorption and piezoresistive self-sensing performance of 3D printed discontinuous carbon fiber (CF)-reinforced polyetheretherketone (PEEK) cellular composites. Experiments conducted on three different 2D lattices with hexagonal, chiral and re-entrant topologies of the same relative density (33%) and CF loading (30 wt%) reveal that the CF/PEEK hexagonal lattice (HL), due its relatively brittle response, shows about 40% and 9% decrease in specific energy absorption (SEA) under in-plane and out-of-plane compression, respectively, compared with PEEK HL. While the collapse response of PEEK HL is nearly insensitive to the strain-rate over 43 ≤ ε̇ ≤ 106 s−1, we observe a twenty-fold increase in peak stress and a five-fold increase in SEA under in-plane impact loading over the same range of strain-rates for the CF/PEEK HL. The CF/PEEK lattices exhibit pronounced piezoresistive response under both in-plane and out-of-plane compression with maximum sensitivity of 3.1 and 5.2, respectively, for the re-entrant lattice, offering insight into the damage-state. Higher damage sensitivity indicates faster percolation of new contacts due to folds forming between the cell walls within the lattice under compression. The energy-absorbing and strain- and damage-sensing nature of 3D printed CF/PEEK lattices demonstrated here offers insight into the design of lightweight, high-performance multifunctional lattices.
KW - 3D Printing
KW - CF/PEEK cellular composites
KW - Honeycomb lattices
KW - Low-velocity impact
KW - Piezoresistive self-sensing
UR - http://www.scopus.com/inward/record.url?scp=85107733330&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2021.109863
DO - 10.1016/j.matdes.2021.109863
M3 - Article
AN - SCOPUS:85107733330
SN - 0264-1275
VL - 208
JO - Materials and Design
JF - Materials and Design
M1 - 109863
ER -