Z-Pinning Approach for Reducing Mechanical Anisotropy of 3D Printed Parts

Date
2018
Authors
Duty, Chad
Failla, Jordan
Kim, Seokpum
Smith, Tyler
Lindahl, John
Roschli, Alex
Post, Brian
Love, Lonnie
Kunc, Vlastimil
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Publisher
University of Texas at Austin
Abstract

The mechanical strength of extrusion-based printed parts is often greatly reduced (25-50%) in the build direction (z-direction) compared to the in-plane strength due to poor bonding between successively deposited layers. This effect can be magnified (75-90% difference) when depositing fiber-reinforced materials or larger print areas with long layer times. Therefore, a patent-pending approach has been developed that deposits material into intentionally aligned voids in the z-direction, allowing continuous material to span multiple layers. The “z-pinning” approach can be applied to several concepts for improving the interlaminar strength of extrusion-based 3D printed parts as well as techniques for applying the technology across a broad spectrum of deposition platforms and material systems. Initial experimental results demonstrate a significant improvement (>3x) in mechanical strength and (>8x) toughness for fiber reinforced components.

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