Abstract
Understanding mechanical failure, crack propagation, and compressive behavior at the micrometer scale is essential for tailoring material properties for structural performance in cellular materials. Typically, modeling of traditional polymer foam materials is clouded by the lack of control in material morphology and its inherent stochastic structure. Additive manufacturing with sub-micrometer resolution provides a direct path for experimenters to specifically tailor structures needed by modelers to explicitly probe mechanical performance. Using laboratory-based 3D X-ray computed tomographic imaging (CT), the examination of deformation and damage provides a critical path to understand how these soft materials behave. Additionally, synchrotron CT yields realistic information at higher strain rates to directly validate the robustness of our finite element modeling. For this study, nanolithographic printing was employed to generate a series of engineered lattices with increasing levels of defects through the random removal of ligaments. These structures were mechanically tested and imaged with laboratory-based microCT. Additionally, synchrotron experiments were conducted in which the structures were imaged in 3D at 14 Hz during compression at a 0.4 s−1 strain rate. These 3D images show the changes in the structure as the ligaments bend, buckle and fracture in real time. This technique provides a robust framework for developing our methodologies and future exploration of engineered structures.
Original language | English (US) |
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Pages (from-to) | 11353-11366 |
Number of pages | 14 |
Journal | Journal of Materials Science |
Volume | 55 |
Issue number | 25 |
DOIs | |
State | Published - Sep 1 2020 |
Funding
Funding for this research was provided by the Los Alamos Institute for Materials Science Rapid Response Program proposal RR1600BP; the LANL Engineering Campaign, the LANL Dynamic Materials Program (Josh Coe, Project Manager) and the LANL Joint Munitions Program (Matt Lewis, Project Manager). Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218NCA000001). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering