Abstract
Vertical directional strength is significantly weaker than planar directional strength in polymer extrusion additive manufacturing due to its layer-wise deposition method. The disparity between the planar strength and vertical strength is even larger for a printed part with a fiber-reinforced thermoplastic. A printing technique has been proposed in which continuous material is extruded across layers throughout the body of the part in order to improve the strength in the vertical direction. The mechanical engagement between the material extruded in vertically aligned holes (called "z-pins") and the surrounding layers is primarily influenced by the geometry of the hole and the extrusion volume of the z-pin. Previously, the z-pinning parameters that provide good penetration in the hole has been evaluated for neat polylactic acid (PLA). The current study investigates z-pinning parameters for carbon fiber-reinforced PLA as a function of the quality of mechanical engagement of the pins with the surrounding structure. The results of this parametric study will provide guidance for general printing applications across multiple platforms with various materials.
| Original language | English |
|---|---|
| State | Published - 2020 |
| Event | International SAMPE Conference and Exhibition 2020 - Virtual, Online Duration: Jun 1 2020 → Jun 1 2020 |
Conference
| Conference | International SAMPE Conference and Exhibition 2020 |
|---|---|
| City | Virtual, Online |
| Period | 06/1/20 → 06/1/20 |
Funding
Research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office and used resources at the Manufacturing Demonstration Facility, a DOE-EERE User Facility at Oak Ridge National Laboratory, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. Research was supported by an appointment to the Oak Ridge National Laboratory Advanced Short-Term Research Opportunity (ASTRO) Program and Higher Education Research Experiences (HERE) program, sponsored by the U.S. Department of Energy and administered by the Oak Ridge Institute for Science and Education. Research was also sponsored by the U.S. Army Combat Capabilities Development Command Aviation & Missile Center. Notice of Copyright: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan)
| Funders | Funder number |
|---|---|
| DOE-EERE | |
| U.S. Army Combat Capabilities Development Command Aviation & Missile Center | |
| U.S. Department of Energy | |
| Advanced Manufacturing Office | |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory | DE-AC05-00OR22725 |
| Oak Ridge Institute for Science and Education |
