Back to Search
Start Over
Dynamic mode-I fracture toughness and damage sensing characterization in additively manufactured ABS nanocomposites.
- Source :
-
International Journal of Advanced Manufacturing Technology . Jul2024, Vol. 133 Issue 5/6, p2277-2292. 16p. - Publication Year :
- 2024
-
Abstract
- This study investigates damage monitoring and fracture toughness characterization of additively manufactured acrylonitrile butadiene styrene (ABS) embedded with carbon nanotubes (CNTs) under dynamic mode-I fracture loading conditions. A novel modified split-Hopkinson pressure bar (SHPB) setup along with high-speed imaging is used to understand the crack dynamics. Electrically conductive CNTs embedded ABS nanocomposite is referred to as ABS-EC in this study. A modified four-probe resistivity measurement technique is utilized to understand the piezo-resistance response of ABS-EC. The effect of four infill line orientations (0°, 90°, ±45°, and 0°/90°) on quasi-static and dynamic mode-I fracture toughness and damage sensing characteristics are studied. Results reveal that the infill line orientations have a significant impact, where with ± 45° configurations demonstrating superior dynamic fracture toughness (2.54 MPa-m1/2) due to the kinking of the crack along the + 45°/−45° direction and the 90° orientations exhibiting weaker interfaces. Real-time observations of crack dynamics validate these findings, emphasizing the role of filament alignment in determining crack pathways and fracture behavior. Among the four infill line orientations, 0°/90° shows the highest (500%) peak piezo-resistance response, whereas the 90° orientation shows the lowest (95%). Moreover, convection oven annealing is explored, where substantial improvement in static fracture toughness (226% increase) for ABS is observed. However, annealing did not enhance the fracture toughness of ABS-EC because CNTs acted as a barrier to restrict the polymer's molecular chain movement for rearranging the porosity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02683768
- Volume :
- 133
- Issue :
- 5/6
- Database :
- Academic Search Index
- Journal :
- International Journal of Advanced Manufacturing Technology
- Publication Type :
- Academic Journal
- Accession number :
- 178333879
- Full Text :
- https://doi.org/10.1007/s00170-024-13950-9