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Compression Behavior of 3D Printed Composite Isogrid Structures
Marina Andreozzi1, Carlo Bruni1, Archimede Forcellese1
1Dipartimento di Ingegneria Industriale e Scienze Matematiche (DIISM), Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy.
Polymers
|October 16, 2024
Summary
3D-printed carbon fiber isogrid structures show improved buckling resistance with higher infill density. Optimizing printing processes is crucial to mitigate voids and enhance performance for demanding applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Carbon fiber-reinforced polymers (CFRPs) offer high strength-to-weight ratios, ideal for aerospace and automotive industries.
- CFRP structures face challenges in compressive behavior due to instability and premature failure.
- Isogrid structures enhance CFRP panel compressive performance, but traditional manufacturing is costly.
Purpose of the Study:
- To investigate the compressive behavior of 3D-printed isogrid CFRP structures.
- To evaluate the impact of infill density on buckling resistance.
- To identify failure modes and microstructural characteristics of 3D-printed isogrids.
Main Methods:
- Fabrication of eight isogrid CFRP panels using continuous fiber 3D printing (Anisoprint Composer A3).
- Buckling tests were performed on the fabricated panels.
- Post-test analysis included optical microscopy and scanning electron microscopy (SEM).
Main Results:
- Buckling resistance directly correlated with infill density; higher density yielded greater buckling loads.
- Failure modes shifted from local to global buckling with increased infill density.
- Voids were observed in 3D-printed structures, negatively impacting mechanical performance.
Conclusions:
- 3D-printed isogrid CFRP structures demonstrate significant buckling resistance, offering a viable alternative for high-performance applications.
- Infill density is a critical parameter for enhancing structural integrity.
- Addressing voids through process optimization is essential for improving the reliability of 3D-printed CFRP isogrids.
