About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
Mechanical Characterisation of Nature-inspired Additive Manufactured Lattices Using X-ray Computed Tomography and Finite Element Analysis |
Author(s) |
David McArthur, Peter Lee, PJ Tan, Chu Lun Alex Leung |
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 FEA, we showed that twinning alters the deformation behaviour of bending-dominated BCC lattices to stretch-dominated, violating the Maxwell criterion and improving stiffness and strength. We additively manufactured twinned and regular Body-Centred Cubic (BCC) and Face-Centred Cubic (FCC) 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 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 |
Additive Manufacturing, Mechanical Properties, Characterization |