Design of metallic textile core sandwich panels

Zok, Frank W.; Rathbun, H.J.; Wei, Zhiyong; Evans, A.G.

doi:10.1016/s0020-7683(03)00375-5

Cited by 116 publications

(79 citation statements)

References 6 publications

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“…Using the experimental truss values r Y = 1030 ± 60 and 969 ± 93 MPa (Table III), a = 1.45 and 1.6 mm, and l = 31 mm, Eq. [3] predicts panel yield strengths of 19 ± 2 and 24 ± 2 MPa for panels B and A. There is reasonable agreement with measured yield strengths of 19 and 29 MPa (Table III), despite the additional face struts found in the present panels but absent in the structure modeled in Eq.…”

Section: Panel Compressive Propertiessupporting

confidence: 85%

“…There is reasonable agreement with measured yield strengths of 19 and 29 MPa (Table III), despite the additional face struts found in the present panels but absent in the structure modeled in Eq. [3], as discussed previously. Figure 10 gives the load-displacement curve for bending tests performed at ambient temperature on a 2 · 4 thick subpanel and a 5 · 8 thin subpanel.…”

Section: Panel Compressive Propertiesmentioning

confidence: 81%

“…The nominal density is 0.71 g/cm 3 for all thick panels (except one panel described later) with a strut diameter of 3.2 mm, corresponding to 16 pct of Ti-6Al-4V bulk density (4.43 g/cm 3 [22] ). The corresponding values are 0.92 g/cm 3 and 21 pct for thin panels with a strut diameter of 1.6 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The higher density for the thin panels is because of their relatively larger frame. After deducting the frame mass, the core densities of panels with thick and thin struts are 0.69 and 0.77 g/cm 3 , respectively, corresponding to 15.6 and 17 pct relative density.…”

Section: Resultsmentioning

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 Propertiessupporting

confidence: 85%

Section: Panel Compressive Propertiesmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Chen²,

Bice³

et al. 2008

Metall Mater Trans A

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Impact and Blast Response of Lattice Materials

Smith

Cantwell

Guan

2017

Dynamics of Lattice Materials

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Compressive Behavior of Pyramidal, Tetrahedral, and Strut‐Reinforced Tetrahedral ABS and Electroplated Cellular Solids

et al. 2009

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Advanced air, land, and sea based vehicle applications requiring high strength and low weight often utilize sandwich panel structures consisting of stiff facesheets and a low density core. Current manufacturing techniques limit core geometries to highly symmetric configurations. Many of these limitations are removed with the use of fused deposition modeling (FDM). Furthermore, electroforming over the model material can be used to dramatically increase the mechanical properties of the parts. This work presents the characterization of three core topologies, tetrahedral, pyramidal, and strutreinforced tetrahedral (SRT) that were optimized for specific strength. The response of fused deposition acrylonitrile butadiene styrene (ABS) plastic and electroform coated ABS cores is presented. The SRT exhibited superior performance in yield strength, ultimate strength, and energy absorption.The demand for faster and more economical air, land, and sea vehicles requires increased weight efficiency. Sandwich panels are commonly used in advanced material systems for weight critical applications. Sandwich panels provide high specific strength and stiffness, making them ideal structures for these engineering applications. The core of the sandwich panel is critical to performance but current core geometries are limited to those manufactured using stochastic foaming processes, [1,2] deformation processes, [3][4][5][6][7][8] and pin insertion techniques. [9][10][11] Wadley et al. [12] presented a review of deformation processes which generate periodic arrays such as pyramidal, [4,7] woven, [5,[13][14][15] tetrahedral, and corrugated cores. [6,16] Additionally, pinning can be used to produce cores with symmetrical or asymmetrical geometries. [9][10][11] Work by Kooistra et al. [17] has suggested that emerging core topologies with higher stiffness and strength efficiency metrics exist but manufacturing limitations prevent full optimization of the core geometries. Rapid prototyping has been embraced by the design and manufacturing community due to its efficiency and ability to produce complex geometries which cannot be developed effectively using traditional machining and manufacturing techniques. Specifically the FDM process generates an ABS plastic structure from a CAD model. The theoretical cores proposed by Deshpande et al. can readily be produced using rapid prototyping techniques. [18] The ability to produce any core geometry, within the tolerance of the machine allows the theoretical cores to be validated.Cores produced from ABS plastic suffer from the limited mechanical properties of ABS. However, work by Burns et al. suggests that electroforming ABS materials with copper and nickel increases the yield strength four-fold and the elastic modulus by up to 15 times making the composite mechanically competitive with structural materials. [19] Electroforming is a technique, like rapid prototyping, which can be used on complex geometries. Electroforming the ABS cores may increase the strength and stiffness of ABS cores making the FDM/...

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Design of metallic textile core sandwich panels

Cited by 116 publications

References 6 publications

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

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

Impact and Blast Response of Lattice Materials

Compressive Behavior of Pyramidal, Tetrahedral, and Strut‐Reinforced Tetrahedral ABS and Electroplated Cellular Solids

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