Structural performance of metallic sandwich beams with hollow truss cores

Rathbun, H.J.; Zok, Frank W.; Waltner, S.A.; Mercer, C.; Evans, A.G.; Queheillalt, Douglas T.; Wadley, H.N.G.

doi:10.1016/j.actamat.2006.07.016

Cited by 37 publications

(20 citation statements)

References 17 publications

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“…When used in designs, this inhomogeneity must be dealt with conservatively, making the foamed metal less suitable for use in structures that require a high level of optimization [4]. The homogeneity of microlattice or microtruss designs offer an attractive alternative to the metal foams, while retaining or improving the characteristics that make cellular structures so desirable [5], especially for engineered sandwich structures [6][7][8].…”

Section: Introductionmentioning

confidence: 98%

Fatigue behavior of IN718 microtrusses produced via additive manufacturing

Huynh¹,

Rotella²,

Sangid³

2016

Materials & Design

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Section: Introductionmentioning

confidence: 98%

Fatigue behavior of IN718 microtrusses produced via additive manufacturing

Huynh¹,

Rotella²,

Sangid³

2016

Materials & Design

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“…[1][2][3][4][5][6] LBSs have been fabricated from various metallic alloys based on aluminum, [1,[5][6][7] copper, [2,5,8,9] and iron. [10][11][12][13] Although titanium alloys are attractive candidates for LBS because of their excellent mechanical properties and corrosion resistance, to the best of our knowledge, only one titanium LBS, fabricated by selective electron beam melting, has been reported in the literature to date. [14] Titanium has been used extensively for foam-core sandwich [15][16][17] and honeycomb structures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Cast Ti-6Al-4V Lattice Block Structures

Chen²,

Bice³

et al. 2008

Metall Mater Trans A

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Ti-6Al-4V lattice block structure panels were fabricated using an aerospace-quality investment casting process. Testing in compression, bending, and impact show that high strength, ductility, and energy absorption are achieved for both individual struts and full panels, despite the intricacies involved with casting fine struts (1.6 or 3.2 mm in diameter) from a highly reactive, poor-fluidity liquid titanium alloy. The panel stress-strain curve calculated by finite-element modeling correlates well with experimental results, indicating that the occasional defects, which are common to aerospace grade castings and may be present in the struts and nodes, have little detrimental effect on the overall panel compressive properties.

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“…Geometry is the main determinant factor in performance [1,2,8,9]. Interest in lattice structures in sandwich panels is growing because of their extremely good density-specific performance [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Near-zero thermal expansivity 2-D lattice structures: Performance in terms of mass and mechanical properties

et al. 2011

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The coefficient of thermal expansivity (CTE), a, of a 2-D dual-material lattice and the effects of varying the constituent materials and geometry were explored in a parametric study. The lattices had geometries similar to those found in lightweight structures in many transport applications including aerospace and spacecraft. The aim was to determine how to reduce the CTE of such structures to near zero, by using two constituent materials with contrasting CTEs, without incurring penalties in terms of other elastic and failure properties, mass and manufacturability. The results are scale independent and so generic to all such lattices. Lattice CTE was primarily driven by the geometry of the lattice and the mismatch in the constituent's CTE and elastic moduli, with zero CTE attainable if (i) the relative lengths of internal members a and b were in the range of 1.4-1.6, and (ii) the contrast between a b and a a was at least 4. Large negative CTEs could be obtained easily if in addition the ratio of moduli E b and E a was more than 10. It was shown that pairings of commonly used materials, in lattices with commonly used geometries, can give near-zero and negative CTEs. It was shown that this dual-material mechanism effectively exchanges distortion for internal stress. With carefully chosen material pairings there were either small or no penalties for the reduced CTE in terms of other key mechanical performance indices, e.g. premature failure. Two lattices were manufactured, one monolithic and one dual-material (grade 2 titanium and aluminium 6082). Their thermal expansivity was measured and found to match closely the analytical model's prediction.

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Structural performance of metallic sandwich beams with hollow truss cores

Cited by 37 publications

References 17 publications

Fatigue behavior of IN718 microtrusses produced via additive manufacturing

Fatigue behavior of IN718 microtrusses produced via additive manufacturing

Mechanical Properties of Cast Ti-6Al-4V Lattice Block Structures

Near-zero thermal expansivity 2-D lattice structures: Performance in terms of mass and mechanical properties

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