TY - JOUR
T1 - Effect of Z-pin inclined angle on the impact damage suppression effectiveness for cross-ply composite laminates
AU - Liao, Binbin
AU - Zhou, Jianwu
AU - Zheng, Jinyang
AU - Tao, Ran
AU - Xi, Li
AU - Zhao, Tian
AU - Li, Ying
AU - Fang, Daining
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/3
Y1 - 2021/3
N2 - Z-pins can enhance through-thickness direction of composite laminates effectively by reducing the delamination damage area. In this paper, the low velocity impact behaviors of [02/902]4S cross-ply composite laminates by inserting Z-pins with two different angle 0° and ±45° along the thickness direction were compared. T300 carbon fiber Z-pins were used as the reinforcements for Z-pinned laminates impacted by 5 J, 10 J, 20 J and 30 J impact energies. The mechanical responses including the impact force-time/central displacement curves were recorded during the tests. Afterwards, ultrasonic C-scanner, scanning electron microscope (SEM) and X-ray micro-computed tomography (μCT) techniques were used to characterize the impact damage. Experimental results demonstrated that the Z-pins were unable to delay the delamination initiation, which led to basically consistent delamination initiation threshold regardless of Z-pin inclined angle. Based on the mechanical characteristics, 0° Z-pinning could improve the resistance to the onset of penetration by comparing to the ±45° Z-pinning. In addition, the effectiveness of 0° Z-pinning on suppression of delamination damage and internal defects was better than the ±45° Z-pinning at high impact energy.
AB - Z-pins can enhance through-thickness direction of composite laminates effectively by reducing the delamination damage area. In this paper, the low velocity impact behaviors of [02/902]4S cross-ply composite laminates by inserting Z-pins with two different angle 0° and ±45° along the thickness direction were compared. T300 carbon fiber Z-pins were used as the reinforcements for Z-pinned laminates impacted by 5 J, 10 J, 20 J and 30 J impact energies. The mechanical responses including the impact force-time/central displacement curves were recorded during the tests. Afterwards, ultrasonic C-scanner, scanning electron microscope (SEM) and X-ray micro-computed tomography (μCT) techniques were used to characterize the impact damage. Experimental results demonstrated that the Z-pins were unable to delay the delamination initiation, which led to basically consistent delamination initiation threshold regardless of Z-pin inclined angle. Based on the mechanical characteristics, 0° Z-pinning could improve the resistance to the onset of penetration by comparing to the ±45° Z-pinning. In addition, the effectiveness of 0° Z-pinning on suppression of delamination damage and internal defects was better than the ±45° Z-pinning at high impact energy.
KW - Composite laminates
KW - Delamination damage projected area
KW - Internal defects
KW - Z-pin inclined angle
UR - http://www.scopus.com/inward/record.url?scp=85098581595&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2020.106264
DO - 10.1016/j.compositesa.2020.106264
M3 - Article
AN - SCOPUS:85098581595
SN - 1359-835X
VL - 142
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
M1 - 106264
ER -