Titanium alloy lattice truss structures

A high-temperature forming and diffusion bonding method has been investigated for the fabrication of modified pyramidal lattice core sandwich structures from a titanium alloy. A periodic asymmetric hexagonal perforation pattern was cut into thin Ti–6Al–4V sheets which were then folded along node row...

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Bibliographic Details
Published in:Materials in engineering 2009-06, Vol.30 (6), p.1966-1975
Main Authors: Queheillalt, Douglas T., Wadley, Haydn N.G.
Format: Article
Language:English
Subjects:
Buckling (I)
Diffusion bonding (D)
Sandwich structures (B)
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Summary:A high-temperature forming and diffusion bonding method has been investigated for the fabrication of modified pyramidal lattice core sandwich structures from a titanium alloy. A periodic asymmetric hexagonal perforation pattern was cut into thin Ti–6Al–4V sheets which were then folded along node rows by a combination of partial low-temperature bending followed by simultaneous hot forming/diffusion bonding to form sandwich panel structures with core relative densities of 1.0–4.1%. The out-of-plane compression and in-plane longitudinal shear properties of these structures were measured and compared with analytical estimates. Premature panel failure by node shear-off fracture was observed during shear testing of some test structures. Node failures were also initiated at stress concentrations at the truss–facesheet interface. A liquid interface diffusion bonding approach has been investigated as a possible approach for reducing this stress concentration and increasing the truss–facesheet interfacial strength.
ISSN:0261-3069
DOI:10.1016/j.matdes.2008.09.015