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

Conference · Sat Dec 01 00:00:00 EST 2018

OSTI ID:1607261

Duty, Chad ^[1]; Failla, Jordan  ^[1]; Kim, Pum  ^[1]; Smith, Tyler ^[1]; Lindahl, John  ^[1]; Roschli, Alex  ^[1]; Post, Brian  ^[1]; Love, Lonnie  ^[1]; Kunc, Vlastimil  ^[1]

---

1. ORNL

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 zdirection, 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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1607261
• Resource Relation: Conference: Solid Freeform Fabrication Symposium (SFF Symposium 2018) - Austin, Texas, United States of America - 8/13/2018 4:00:00 PM-8/15/2018 12:00:00 PM
• Country of Publication: United States
• Language: English