http://www.sciepub.com/journal/AJME American Journal of Mechanical Engineering is a peer-reviewed, open access journal that publishes original research articles and review articles in all areas of Mechanical Engineering. The aim of the journal is to provide academicians, researchers and professionals a platform to share cutting-edge development in the field of Mechanical Engineering. Science and Education Publishing en 2013 Science and Education Publishing Co. Ltd All rights reserved. American Journal of Mechanical Engineering 14 1 January 2026 2013 Science and Education Publishing Co. Ltd All rights reserved. http://pubs.sciepub.com/ajme/14/1/1 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 (K_IC) 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 (G_IC) 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.]]> Saeed Al-Noman, Somia Alfatih M. S., Mohammed Ghazi Gronfula, Galal Al-Mekhlafi, Mohammed Y. Abdellah, Abdulmajid AlAliw, Mohammed K. Hassan 2026-01-08 Science and Education Publishing 2026-01-08 1 14 1 6 10.12691/ajme-14-1-1 http://pubs.sciepub.com/ajme/14/1/2 Chaim Vivien DOTO, Sylvain SOROTORI, Djigbo Félicien BADOU, Samuel Fernand GOUDA, Hyppolite AGADJIHOUEDE 2026-02-05 Science and Education Publishing 2026-02-05 1 14 7 13 10.12691/ajme-14-1-2