The structural performance of near-optimized truss core panels

Chiras, S.; Mumm, Daniel R.; Evans, A.G.; Wicks, Nathan; Hutchinson, John W.; Dharmasena, Kumar P.; Wadley, H.N.G.; Fichter, S.

doi:10.1016/s0020-7683(02)00241-x

Cited by 271 publications

(140 citation statements)

References 10 publications

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“…Using the upper bound of measured strut modulus E s = 100 GPa (close to the 105 GPa lower bound for bulk Ti-6Al-4V, Table III), Eq. [2] predicts stiffness values for panels A and B (with 13.1 and 16.0 pct relative densities) of 2.7 and 3.2 GPa, respectively, as compared with measured values of 1.2 and 2.9 GPa (Table III), respectively. Deshpande et al [6] also found that Eq.…”

Section: Panel Compressive Propertiesmentioning

confidence: 77%

“…Deshpande et al [6] also found that Eq. [2] overpredicted the modulus of a cast aluminum alloy LBS panel, which they attributed to the ''bedding-in'' of the struts into the nodes during the initial stages of deformation. Additionally, the present panels exhibit nodes that are thicker than in the model, as well as additional face struts, which both reduce their stiffness as compared with Eq.…”

Section: Panel Compressive Propertiesmentioning

confidence: 99%

“…Additionally, the present panels exhibit nodes that are thicker than in the model, as well as additional face struts, which both reduce their stiffness as compared with Eq. [2].…”

Section: Panel Compressive Propertiesmentioning

confidence: 99%

“…[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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Panel Compressive Propertiesmentioning

confidence: 77%

Section: Panel Compressive Propertiesmentioning

confidence: 99%

“…Additionally, the present panels exhibit nodes that are thicker than in the model, as well as additional face struts, which both reduce their stiffness as compared with Eq. [2].…”

Section: Panel Compressive Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Chen²,

Bice³

et al. 2008

Metall Mater Trans A

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“…Lattice structures such as corrugations, honeycombs and trusses have high quasi-static stiffness and strength [8][9] and high dynamic strength [10][11]: they show potential as the cores of sandwich plates. However, experimental studies are needed in order to demonstrate explicitly their performance advantage in terms of underwater blast resistance.…”

Section: Introductionmentioning

confidence: 99%

Underwater blast response of free-standing sandwich plates with metallic lattice cores

McShane

Deshpande

Fleck

2010

International Journal of Impact Engineering

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The underwater blast response of free standing sandwich plates with a square honeycomb core and a corrugated core has been measured. The total momentum imparted to the sandwich plate and the degree of core compaction are measured as a function of (i) core strength, (ii) mass of the front face sheet (that is, the wet face) and (iii) time constant of the blast pulse. Finite element calculations are performed in order to analyse the phases of fluid-structure interaction. The choice of core topology has a strong influence upon the dynamic compressive strength and upon the degree of core compression, but has only a minor effect upon the total momentum imparted to the sandwich. For both topologies, a reduction in the mass of the front (wet) face reduces the imparted momentum, but at the expense of increased core compression.Conversely, an increase in the time constant of the blast pulse results in lower core compression, but the performance advantage over a monolithic plate in terms of imparted momentum is reduced. The sandwich panel results are compared with analytical results for monolithic plates of mass equal to that of (i) the sandwich panel and (ii) the front face alone. (Case (i) represents a rigid core while (ii) represents a core of negligible strength.) For most conditions considered, the sandwich results lie between these limits reflecting the coupled nature of core deformation and fluidstructure interaction.

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Cellular Metals Manufacturing

Wadley¹

2002

Adv. Eng. Mater.

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236

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Manufacturing Methods OverviewAs the engineering applications of cellular metals grows, many methods for their manufacture are being developed. [1] They result in materials that can be classified by the size of their cells, variability in cell size (stochastic or periodic), the pore type (open or closed) and the relative density of the structure. Figure 1 summarizes the range of cell size and relative density for materials created by established and emerging manufacturing methods. Those with high relative density, r/ r s >0.5 (where r is the cellular metals density and r s is that of the solid from which it is made) include Gasars made by the solidification of metal-H 2 alloys [2] and expanded, entrapped gas materials. [3] Interest in the structural uses of both materials has declined because of the difficulty of creating the low relative densities (0.05±0.20) needed for these applications. [4] Manufacturing methods based upon the foaming of a liquid metal, either by injecting a gas (the CYMAT process) [5] or by the decomposition of gas releasing particles (e.g. the Alporus or Alulight materials) [6] are the most widely used for making stochastic cellular aluminum. Efforts are underway to extend the method to other metals. Both approaches result in closed cell stochastic foams with cell sizes in the 0.5 to 15 mm range and relative densities from 0.04 to 0.4.Open cell, stochastic nickel foams are widely used for the electrodes and current collectors of metal ± metal hydride batteries. Closed cell, periodic aluminum honeycomb is extensively used for the cores of light, stiff sandwich panel structures. Interest is now growing in other cell topologies and potential applications are expanding. For example cellular metals are being evaluated for impact energy absorption, for noise and vibration damping and for novel approaches to thermal management. Numerous methods for manufacturing cellular metals are being developed. As a basic understanding of the relationships between cell topology and the performance of cellular metals in each application area begins to emerge, interest is growing in processes that enable an optimized topology to be reproducibly created. For some applications, such as acoustic attenuation, stochastic metal foams are likely to be preferred over their periodically structured counterparts. Nonetheless, the average cell size, the cell size standard deviation, the relative density and the microstructure of the ligaments are all important to control. The invention of more stable processes and improved methods for on-line control of the cellular structure via in-situ sensing and more sophisticated control algorithms are likely to lead to significant improvements in foam topology. For load supporting applications, sandwich panels containing honeycomb cores are much superior to those utilizing stochastic foams, but they are more costly than stochastic foam core materials. Recently, processes have begun to emerge for making open cell periodic cell materials with triangular or pyramidal truss topologies. Th...

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The structural performance of near-optimized truss core panels

Cited by 271 publications

References 10 publications

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

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

Underwater blast response of free-standing sandwich plates with metallic lattice cores

Cellular Metals Manufacturing

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