Date:

2025-04-30

Title of Paper:

Interfacial performance and fracture patterns of 3D printed continuous carbon fiber with sizing reinforced PA6 composites

Journal:

Composite Part A

Summary:

3D printing of continuous fiber reinforced thermoplastic composites (CFRTPCs) have drawn increasing interests due to the simple forming process, low cost and capability to produce complex structure. Sizing usually acts as a link between reinforcing fiber and matrix to improve the interfacial adhesion and thus achieve excellent mechanical performance. A carbon fiber sizing procedure was proposed and utilized in the 3D printing process of continuous carbon fiber reinforced PA6 composites. The sized carbon fiber (SCF) reinforced PA6 (SCF/PA6) exhibited 42.2% higher interlaminar shear strength (ILSS) than that of virgin carbon fiber (VCF) reinforced PA6 (VCF/PA6). The evolution of interfacial performance and fracture patterns was systematically studied. Weak bonding interfaces with fiber pull-out were always observed in VCF/PA6 specimens. Overstrong bonding interfaces with fiber cut-off arose in SCF/PA6 due to the excessive forming pressure. They were both detrimental to stress transfer and reduced the flexural strength of 3D printed composites. Moderate bonding interfaces with limited fiber pull-out in SCF/PA6 under decent forming pressure achieved maximum 82% and 246% increasement in flexural strength and modulus respectively. The interface optimization strategy for 3D printed CFRTPCs was set up, which could speed up the technological progress for practical industrial applications.

Co-author:

Tengfei Liua, Xiaoyong Tiana,*, Manyu Zhanga, Abliz Dilmurata,b, Dichen Lia, Ger

Translation or Not:

No

Date of Publication:

2018-09-01