|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Multi-material Additive Manufacturing: Processing and Materials Design
||Understanding and Predicting the Heterogeneous Local Ligament-level Deformation Response in Metal Lattice Structures
||Holly Carlton, Jonathan Lind, Mark Messner, Nickolai Volkoff-Shoemaker, Nathan Barton, Mukul Kumar
|On-Site Speaker (Planned)
Additive Manufacturing is enabling the realization of light-weighting lattice structures, with remarkable strength-to-weight ratios, previously considered inconceivable at small length-scales. However, the deformation behavior of lattice structures is extremely heterogeneous and challenging to predict. Unlike bulk materials, the mechanical behavior of lattice structures is strongly dominated by topology selection. Therefore, there is a need to perform high fidelity experiments that investigate unit cell deformation mechanisms. This study reports on high resolution mapping of the heterogeneous structural response of lattices to macro-scale deformation and compares the results to model predictions. Several structures, which are known to show different stress-strain responses, were evaluated using compression tests coupled with in situ synchrotron radiation micro-tomography. The experimental results confirmed that the transition from linear elastic to non-linear anelastic mechanical response was highly dependent on the topology in the long-range periodic structure and demonstrated that there was a transition in failure mode for stretch-dominated lattices.
||Planned: Supplemental Proceedings volume