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3D printed cellular solid outperforms traditional stochastic foam in long-term mechanical response.

A Maiti1, W Small1, J P Lewicki1

  • 1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

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3D printed polymeric foams demonstrate superior long-term mechanical performance and micro-architectural stability compared to traditional stochastic foams. Accelerated aging and advanced analysis predict enhanced durability for 3D printed materials.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • 3D printing via direct-ink-write offers programmable microstructures and tunable mechanical properties in polymeric foams.
  • The long-term stability and mechanical performance of 3D printed foams are critical for replacing traditional stochastic foams.

Purpose of the Study:

  • To predict and compare the long-term mechanical performance and micro-architectural stability of 3D printed foams versus stochastic foams under compressive strain.
  • To elucidate the microstructural factors contributing to the long-term performance differences.

Main Methods:

  • Accelerated aging studies under compressive strain over multiple years.
  • Time-temperature-superposition analysis utilizing a minimum-arc-length-based algorithm.
  • X-ray computed tomography for microstructural imaging and finite-element analysis for mechanical response evaluation.

Main Results:

  • Master curves predicted superior long-term performance for 3D printed foams regarding compression set and load retention.
  • X-ray computed tomography revealed wider stress variations and more extreme local stresses in stochastic foams compared to 3D printed foams.
  • Finite-element analysis supported the improved long-term stability of 3D printed materials due to more uniform stress distribution.

Conclusions:

  • 3D printed polymeric foams exhibit enhanced long-term mechanical performance and stability over traditional stochastic foams.
  • The predictable and uniform microstructures of 3D printed foams contribute to their superior durability under sustained mechanical load.
  • This study validates 3D printed foams as a promising alternative to stochastic foams for demanding applications requiring long-term reliability.