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Fracture of three-dimensional lattices manufactured by selective laser melting

Research output: Contribution to journalArticle

Original languageEnglish
JournalInternational Journal of Solids and Structures
Early online date29 Jul 2019
DateAccepted/In press - 28 Jul 2019
DateE-pub ahead of print (current) - 29 Jul 2019

Abstract

Experimentation has been performed to measure the fracture behaviour of
three-dimensional lattices manufactured using a Selective Laser Melting (SLM)
technique. Specimens have been designed using a compact tension (CT) geometry with different lattice orientations and fabricated from a relatively brittle
Aluminum alloy. The toughness has been measured and an increase in fracture
resistance has been observed during crack extension. The influence of lattice orientation has been demonstrated, which shows that a change in orientation will
result in a different crack path, but the effect on toughness is small. Finally, the
significance of specimen size on toughness measurement has been investigated
using finite element (FE) analysis. The results show that the experimentally
measured result have overestimated the fracture toughness of the lattice specimens by approximately 10% due to the insufficiently large specimen size.

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