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Abdelhaleem, A.M., et al., Mechanical properties of ABS embedded with basalt fiber fillers. Journal for Manufacturing Science and Production, 2016. 16(2): p. 69-74.

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Article

Mechanical Performance and Crack Propagation Resistance in 3D-Printed Nylon-Carbon Composites

1Mechanical Engineering Department, College of Engineering, Alasala Colleges, Dammam 31483, Saudi Arabia

2Department of Electrical Engineering, College of Engineering, Alasala Colleges, Dammam 32324, Saudi Arabia

3Department of Civil Engineering, College of Engineering, Alasala Colleges, Dammam 32324, Saudi Arabia

4Industrial Engineering Department, College of Enineering and Computer Science, Mustaqbal University, Buraydh, Qassim, 51411, Saudi Arabia


American Journal of Mechanical Engineering. 2026, Vol. 14 No. 1, 1-6
DOI: 10.12691/ajme-14-1-1
Copyright © 2026 Science and Education Publishing

Cite this paper:
Saeed Al-Noman, Somia Alfatih M. S., Mohammed Ghazi Gronfula, Galal Al-Mekhlafi, Mohammed Y. Abdellah, Abdulmajid AlAliw, Mohammed K. Hassan. Mechanical Performance and Crack Propagation Resistance in 3D-Printed Nylon-Carbon Composites. American Journal of Mechanical Engineering. 2026; 14(1):1-6. doi: 10.12691/ajme-14-1-1.

Correspondence to: Mohammed  Y. Abdellah, Mechanical Engineering Department, College of Engineering, Alasala Colleges, Dammam 31483, Saudi Arabia. Email: Mohammed.ahmad@alasala.edu.sa

Abstract

This study investigates the fracture toughness of 3D-printed Polyamide 12 (PA-12) reinforced with carbon fiber. Tensile tests demonstrated an average ultimate tensile strength of 74.24 MPa. Compact tension tests on specimens (W=14 mm, B=4 mm, a=8 mm) revealed a critical load of 1.8 kN. The fracture toughness (KIC) was calculated as 36.8 MPa√m following ASTM E399 standards. Using an experimental elastic modulus of 5 GPa typical for carbon fiber reinforced PA-12 composites, the corresponding critical strain energy release rate (GIC) was determined to be 245 kJ/m². This substantial fracture resistance, combined with the observed mixed-mode failure mechanisms including fiber bridging and matrix deformation, indicates that 3D-printed PA-12 carbon fiber composites offer promising damage tolerance for structural applications.

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