TY - GEN
T1 - Effect of Post-processing on the Compressive Performance of 3D-Printed CFRPs Revealed by Computed Tomography
AU - Cai, Yuwei
AU - Fan, Zhewei
AU - Luan, Haotian
AU - Wang, Xinyu
AU - Zhou, Siyuan
AU - Si, Zhujun
AU - Wang, Ying
N1 - Publisher Copyright:
© Press of Acta Aeronautica et Astronautica Sinica 2026.
PY - 2026
Y1 - 2026
N2 - Due to the characteristics of the process, 3D-printed composite materials will have additional pores compared to those manufactured by traditional methods. Therefore, it is of crucial significance to study the distribution of pores, the methods for reducing them, and the influence of pores on the mechanical properties of materials. In this study, the composite materials were imaged with X-ray computed tomography in 3D, and semantic segmentation of pores and cracks was carried out based on U-Net, based on which detailed analysis of the defects has been accomplished. It is found that there are more smaller pores in the −45° and 45° plies, presumably because the nozzle decomposed the oblique displacement into multiple 0° and 90° micro-displacements during the printing process. Meanwhile, pores with a volume ranging from 103 to 106 μm3 predominantly exist within each lamina whereas pores with larger or smaller volumes mainly exist in the interlaminar regions. Additionally, compression tests show that post-processing by compression moulding shifts the dominating damage mode from kink band to delamination under compression.
AB - Due to the characteristics of the process, 3D-printed composite materials will have additional pores compared to those manufactured by traditional methods. Therefore, it is of crucial significance to study the distribution of pores, the methods for reducing them, and the influence of pores on the mechanical properties of materials. In this study, the composite materials were imaged with X-ray computed tomography in 3D, and semantic segmentation of pores and cracks was carried out based on U-Net, based on which detailed analysis of the defects has been accomplished. It is found that there are more smaller pores in the −45° and 45° plies, presumably because the nozzle decomposed the oblique displacement into multiple 0° and 90° micro-displacements during the printing process. Meanwhile, pores with a volume ranging from 103 to 106 μm3 predominantly exist within each lamina whereas pores with larger or smaller volumes mainly exist in the interlaminar regions. Additionally, compression tests show that post-processing by compression moulding shifts the dominating damage mode from kink band to delamination under compression.
KW - 3D Printing
KW - Continuous Carbon Fibre
KW - Kink band
KW - Porosity
KW - U-Net
KW - X-ray Computed Tomography
UR - https://www.scopus.com/pages/publications/105028363686
U2 - 10.1007/978-981-95-3037-3_44
DO - 10.1007/978-981-95-3037-3_44
M3 - 会议稿件
AN - SCOPUS:105028363686
SN - 9789819530366
T3 - Lecture Notes in Mechanical Engineering
SP - 616
EP - 627
BT - Proceedings of the 2nd Aerospace Frontiers Conference, AFC 2025 - Volume VI
PB - Springer Science and Business Media Deutschland GmbH
T2 - 2nd Aerospace Frontiers Conference, AFC 2025
Y2 - 11 April 2025 through 14 April 2025
ER -