| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Spatially Tailored Materials: Processing-Structure-Properties
|
| Presentation Title |
Mechanical characterisation of micro-architected AM lattices using X-ray computed tomography |
| Author(s) |
David McArthur, Chu Lun Alex Leung, PJ Tan |
| On-Site Speaker (Planned) |
David McArthur |
| Abstract Scope |
Lattices exhibit high strength-to-weight ratios and specific energy absorption, making them of great benefit to aerospace, automotive and biomedical industries. To strengthen these lattices, we have borrowed the concept of twinning, a grain boundary strengthening mechanism found in metals at micron-scale, and replicated it in lattices at millimetre scale. Through numerical simulation, we showed that twinning alters the deformation behaviour of bending-dominated lattices to stretch-dominated, violating the Gibson-Ashby model and improving stiffness, strength and energy absorption. We additively manufactured twinned Ti64 and polymeric lattices and used X-ray Computed Tomography (XCT) to characterise the sample geometry and build defects. Subsequently, the failure mechanisms of these lattices were revealed in 4D using in-situ interrupted mechanical testing coupled with synchrotron XCT. We showed that the twinned architecture impedes the propagation of bands of localised shear strain, by which lattices collapse plastically, improving the yield strength and energy absorption. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Additive Manufacturing, Modeling and Simulation |