TY - JOUR
T1 - Dynamic inter-fibre failure of unidirectional composite laminates with through-thickness reinforcement
AU - Cui, Hao
AU - Yasaee, Mehdi
AU - Melro, António R.
PY - 2019/5/26
Y1 - 2019/5/26
N2 - Unidirectional composite laminates reinforced in the thickness direction with Z-pins are tested in tension and compression with different off-axis angles at high loading rate. A split Hopkinson bar setup and a high speed imaging system have been used for these dynamic tests. It is found that the inter-fibre strength was reduced by Z-pinning in tension and shear dominated failure modes, and the reduction from dynamic loading conditions is greater than that in quasi-static. However, the laminate strength was not significantly influenced by Z-pinning when loaded predominantly in compression. This difference was caused by the transition of failure mechanisms around Z-pins. The stiffness of the laminate was not affected by Z-pins at elevated strain rates, since the increased epoxy stiffness helped to make up for the stiffness loss due to reduced fibre volume fraction resulting from Z-pins.
AB - Unidirectional composite laminates reinforced in the thickness direction with Z-pins are tested in tension and compression with different off-axis angles at high loading rate. A split Hopkinson bar setup and a high speed imaging system have been used for these dynamic tests. It is found that the inter-fibre strength was reduced by Z-pinning in tension and shear dominated failure modes, and the reduction from dynamic loading conditions is greater than that in quasi-static. However, the laminate strength was not significantly influenced by Z-pinning when loaded predominantly in compression. This difference was caused by the transition of failure mechanisms around Z-pins. The stiffness of the laminate was not affected by Z-pins at elevated strain rates, since the increased epoxy stiffness helped to make up for the stiffness loss due to reduced fibre volume fraction resulting from Z-pins.
UR - http://www.scopus.com/inward/record.url?scp=85063775299&partnerID=8YFLogxK
U2 - 10.1016/j.compscitech.2019.04.004
DO - 10.1016/j.compscitech.2019.04.004
M3 - Article (Academic Journal)
AN - SCOPUS:85063775299
VL - 176
SP - 64
EP - 71
JO - Composites Science and Technology
JF - Composites Science and Technology
SN - 0266-3538
ER -