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Multi-Material Additive Manufacturing of Sustainable Innovative Materials and Structures.

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Summary

This study explores multi-material additive manufacturing using recycled thermoplastics like ABS, PLA, and HIPS. The research demonstrates the potential for creating functional prototypes and meta-materials with tailored mechanical properties.

Keywords:
fused deposition modellingmechanical meta-materialsmulti-material printingtensile propertiesthermal properties

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Polymer Engineering

Background:

  • Recycled thermoplastics offer sustainable feedstock for additive manufacturing.
  • Multi-material printing enables complex structures with tailored properties.
  • Fused Deposition Modeling (FDM) is a common additive manufacturing technique for polymers.

Purpose of the Study:

  • To investigate the multi-material additive manufacturing (AM) of functional prototypes using recycled acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), and high impact polystyrene (HIPS).
  • To evaluate the thermal and mechanical performance of multi-material tensile specimens fabricated via FDM.
  • To explore the potential of these materials in load-bearing structures and mechanical meta-materials.

Main Methods:

  • Selected three recycled thermoplastics (ABS, PLA, HIPS) for multi-material AM.
  • Printed tensile specimens (ASTM D638 type-IV) using FDM with varied layer combinations, printing speeds, and infill densities.
  • Conducted thermal analysis (glass transition temperature, heat capacity) and mechanical testing (peak load, strength, elongation, Young's modulus).
  • Analyzed microstructures using photomicrography.

Main Results:

  • Characterized the thermal and mechanical properties of multi-material specimens printed with different ABS/PLA/HIPS combinations.
  • Demonstrated variations in Young's modulus, peak strength, and elongation based on material composition and printing parameters.
  • Microstructural analysis provided insights into material interfaces and structural integrity.

Conclusions:

  • Multi-material AM using recycled ABS, PLA, and HIPS is feasible for producing functional prototypes.
  • The study provides data on the mechanical performance of these composites, guiding material selection for specific applications.
  • Additive manufacturing of recycled thermoplastics holds promise for sustainable and advanced material development.