Abstract
A356/316 L interpenetrating phase composites can be fabricated by infiltrating additively-manufactured 316 L stainless-steel lattices with a molten A356 aluminum alloy, a new process termed PrintCasting. This work investigates the mechanical properties of PrintCast composites and their relation to the volume-fraction of 316 L reinforcement. Uniaxial tension experiments were conducted with A356/316 L PrintCast composites that had either 30 vol%, 40 vol% or 50 vol% 316 L. When 316 L reinforcement increased from 30 vol% to 40 vol%, a > 200% increase in ductility and 400% increase in absorbed-energy were observed, while a much lower increase was exhibited when reinforcement increased from 40 vol% to 50 vol%. The failure of the 30 vol% sample occurred by localized deformation and a single failure initiation region, in contrast to the 40 vol% and 50 vol% samples which failed by delocalized damage in the entire gauge section. To understand this transition phenomena, digital image correlation (DIC) was coupled with finite element (FE) analysis to capture the deformation and failure processes. The results revealed that, for all samples, stress concentrated and failure initiated in a 316 L strut near the lattice nodes, where the strut underwent localized bending-dominated deformation. In the high 316 L volume-fraction composites, the increase in 316 L-strut diameter reduced local bending stress and stabilized the deformation, leading to improved damage tolerance. Based on the presented analysis, local modifications to the PrintCast structure are suggested.
| Original language | English |
|---|---|
| Article number | 109061 |
| Journal | Materials and Design |
| Volume | 195 |
| DOIs | |
| State | Published - Oct 2020 |
Funding
This research was sponsored by the US Department of Energy, Office of Vehicle Technology, under a prime contract with Oak Ridge National Laboratory (ORNL). Authors thank Sebastien Dryepondt and Abigail Barnes (ORNL) for reviewing the manuscript and Prof. Zachary Cordero (Rice University) for the discussions. ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract DE-AC05 00OR22725. This work was funded by the DOE Office of Energy Efficiency & Renewable Energy and Vehicle Technologies Office under the Powertrain Materials Core Program. This research was sponsored by the US Department of Energy , Office of Vehicle Technology, under a prime contract with Oak Ridge National Laboratory (ORNL). Authors thank Sebastien Dryepondt and Abigail Barnes (ORNL) for reviewing the manuscript and Prof. Zachary Cordero (Rice University) for the discussions. ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract DE-AC05 00OR22725 . This work was funded by the DOE Office of Energy Efficiency & Renewable Energy and Vehicle Technologies Office under the Powertrain Materials Core Program . This manuscript has been by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE 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 Office of Energy Efficiency & Renewable Energy and Vehicle Technologies Office | |
| Office of Vehicle Technology | |
| Sebastien Dryepondt and Abigail Barnes | |
| US Department of Energy | |
| U.S. Department of Energy | DE-AC05 00OR22725 |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |
Keywords
- Additive manufacturing
- Composites
- Digital image correlation
- Finite element analysis
