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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Updated: Sep 30, 2025

Author Spotlight: Real-Time Imaging of Bonding in 3D-Printed Layers
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Compression Performance and Deformation Behavior of 3D-Printed PLA-Based Lattice Structures.

Dongxue Qin1, Lin Sang2, Zihui Zhang2

  • 1Department of Radiology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116027, China.

Polymers
|March 10, 2022
PubMed
Summary

Biodegradable PLA composite filaments with calcium carbonate and TCP were 3D printed into lattice structures. The TPMS-D design demonstrated superior strength and energy absorption compared to cubic designs.

Keywords:
compression propertiescomputed tomography (CT) scanningpolylactic acid (PLA)triply periodic minimal surfaces (TPMS)

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Additive Manufacturing

Background:

  • Polylactic acid (PLA) is a biodegradable polymer with potential for 3D printing applications.
  • Lattice structures offer high strength-to-weight ratios and tunable mechanical properties.
  • Enhancing PLA's mechanical performance and structural integrity is crucial for load-bearing applications.

Purpose of the Study:

  • To fabricate biodegradable PLA-based composite filaments for 3D printing.
  • To investigate the effect of inorganic fillers (CaCO3 and TCP) on PLA composite properties.
  • To evaluate the performance of 3D-printed cubic and TPMS-D lattice structures under axial compression.

Main Methods:

  • Fabrication of PLA composite filaments incorporating calcium carbonate (CaCO3) and tricalcium phosphate (TCP).
  • Characterization of material composition, mechanical properties, and rheology of the filaments.
  • 3D printing of cubic and Triply Periodic Minimal Surfaces-Diamond (TPMS-D) lattice structures.
  • Axial compression testing and computed tomography (CT) scanning to analyze structural behavior and deformation.

Main Results:

  • The addition of CaCO3 and TCP enhanced the compressive modulus and strength of the PLA-based lattice structures.
  • TPMS-D lattice structures exhibited superior load-carrying capacity and specific energy absorption compared to cubic lattice structures.
  • TPMS-D structures maintained their pore integrity post-compression, while cubic structures experienced strut fracture.

Conclusions:

  • Biodegradable PLA composite filaments with CaCO3 and TCP are suitable for 3D printing load-bearing lattice structures.
  • TPMS-D lattice structures demonstrate excellent energy absorption and structural stability, outperforming cubic designs.
  • This research offers promising biodegradable materials for advanced 3D-printed structural components with high performance.