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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Altering the Elastic Properties of 3D Printed Poly-Lactic Acid (PLA) Parts by Compressive Cyclic Loading.
Tomaž Pepelnjak1, Ako Karimi2, Andraž Maček1
1Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia.
Materials (Basel, Switzerland)
|October 14, 2020
Summary
This study investigated how infill line distance in 3D printed poly-lactic acid (PLA) components affects their stiffness under compression. Findings show cyclic loading alters sample properties, impacting performance in lightweight designs.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Cellular structures offer a pathway to high-performance, lightweight components.
- Poly-lactic acid (PLA) is a widely used thermoplastic in fused filament fabrication (FFF) additive manufacturing.
Purpose of the Study:
- To analyze the impact of infill line distance in 3D printed PLA samples on their compressive elastic behavior.
- To investigate the stiffness of cellular PLA structures under cyclic compressive loading.
Main Methods:
- Cylindrical PLA samples (diameter 11.42 mm, height 10 mm) were fabricated using FFF with infill line distances of 1.6 mm and 2.4 mm.
- Samples underwent cyclic compressive loading to evaluate stiffness and elastic behavior.
Main Results:
- The initial loading cycle response differed significantly from subsequent cycles.
- The modulus of elasticity was analyzed in relation to cyclic loading effects.
- Stiffness and other sample properties were found to be alterable through elastic and combined elastic-plastic deformation.
Conclusions:
- Infill line distance is a critical parameter influencing the compressive elastic behavior of 3D printed PLA cellular structures.
- Cyclic loading can modify the mechanical properties of these lightweight components, suggesting potential for tunable performance.
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