Elastic Response of Titanium Foams During Compression Tests and Using Laser‐Ultrasonic Probing

Lefebvre, Louis‐Philippe; Blouin, Alain; Rochon, Sara-Michèle; Bureau, Martin

doi:10.1002/adem.200600080

Cited by 8 publications

(4 citation statements)

References 8 publications

(10 reference statements)

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“…For comparison, data for other Ti foams are also plotted. [27,[35][36][37] Solid yield strengths are s s ¼ 735 MPa for the present scrolls (estimated, see text), and 760 MPa for Erk et al [27] (measured) and for Zou et al [35] (assumed, no measurement reported). titanium.…”

Section: Microstructure and Hardness Of Annealed Ti Scrollsmentioning

confidence: 70%

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

et al. 2011

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Titanium and its alloys find widespread use in skeletal implants and biomedical devices (e.g., stents and orthodontic applications) owing to their excellent corrosion resistance, bio-compatibility, static and fatigue strength, and lack of magnetism (an important property for magnetic imaging). [1] Microporous titanium provides two additional advantages for implant applications: first, it reduces the stiffness of the material, thus reducing stress shielding, [2,3] and, second, it improves implant anchorage by allowing bone ingrowth. [4][5][6] To date, powder metallurgy approaches have been widely used to create porous Ti structures, through partial sintering, [7][8][9] inclusion of pore formers, [10][11][12][13] expansion of pores pressurized with argon or hydrogen gas, [14,15] or replication of cellular polymers. [16,17] Embrittlement often arises during processing due to the strong chemical affinity of titanium at elevated temperature with atmospheric oxygen, carbon, and nitrogen. Alternate efforts have focused on producing microarchitectured titanium, composed of lattice or truss structures with struts arranged periodically in space. These structures exhibit an outstanding combination of low density, high strength and stiffness, and good damage tolerance. [18] To date, production methods for microarchitectured titanium have focused on replication precision casting, [19,20] sintering of stacked wire arrays, [21] as well as selective electron beam, [22][23][24] or laser [25] sintering of Ti powders.Recently, we introduced a new method for creating 3D microarchitectured Ti structures that combines: [26] (i) direct ink writing (DIW) of planar lattices composed of two layers of orthogonally oriented, patterned TiH 2 filament arrays, followed by (ii) rolling of these pliable lattices into scrolls, or folding into complex three-dimensional shapes, and finally (iii) heat-treating to reduce the hydride to metallic titanium. This new method is characterized by its simplicity, high shape versatility, and ability to control local geometry, as well as scalability to larger structures. [26] Here, we use this novel COMMUNICATION[*] Prof.

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Section: Microstructure and Hardness Of Annealed Ti Scrollsmentioning

confidence: 70%

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

et al. 2011

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“…Furthermore, materials in their unloaded state have intrinsic elastic properties worth to be known if accessible. Experimental information for the unloaded state can be obtained for example from laser ultrasonic probing or from the extrapolation at zero strain of elastic data from the unloading stage of mechanical tests [Lefebvre et al 2006].…”

Section: Patrick Franciosi Renald Brenner and Abderrahim El Omrimentioning

confidence: 99%

Effective property estimates for heterogeneous materials with cocontinuous phases

Franciosi

Brenner

Omri

2011

J. Mech. Mater. Struct.

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This work concerns heterogeneous multiphase materials which may exhibit omnidirectional full or partial cocontinuity of several or all phases. The estimate of their effective (mechanical or physical) properties is not yet well handled as compared to those for well-defined aggregate or reinforced-matrix structures, especially in the context of homogenization methods. We propose in this framework a modeling scheme which aims at accounting for such phase cocontinuity features. In the mechanical application field, the modeling validity restricts to elastic properties of unloaded materials or in load situations as far as bending and torsion effects of possibly strut-like phase parts are not essential. For other physical properties (dielectric, magnetic, etc.), the modeling applications concern those for which homogenization approaches are relevant. The modeling is based on a material's morphology description in terms of a generalization of so-called "fiber systems" that were introduced in early literature reports. Using parameters that describe the clustering characteristics of the individual phases and of their assemblage, we have considered these fiber systems both within a layer-based approach of the material structure and within an aggregate-like one. By these two routes, we have obtained two estimate forms that differ only slightly in definition. The presentation uses the elasticity formalism, in simple cases of isotropic mixtures of two-phase materials with isotropic phase behavior but the modeling extends to n-phase anisotropic materials as established separately. Our estimates are compared with basic variational bounds and homogenization estimates, with some literature data and with homogenization results obtained with the fast Fourier transform approach on numerical structures. All data are matched with different parameter sets corresponding to different types of phase organization. The two estimates remain nearly equal for all of the examined structures regardless of phase contrast and with only slight differences consistent with their definition difference.

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“…To overcome this limitation, laser ultrasonic techniques is a very attractive solution. 8,[37][38][39][40][41][42][43] For glass plates, Poisson's ratio usually ranges from 0.17 to 0.27, and both S 1 S 2 -and A 2 A 3 -ZGV modes exist. 31 It was shown that the Poisson's ratio can be determined from the ratio of the resonance frequencies of the symmetric S 1 S 2and antisymmetric A 2 A 3 -ZGV modes.…”

Section: Introductionmentioning

confidence: 99%

Effect of refracted light distribution on the photoelastic generation of zero-group velocity Lamb modes in optically low-absorbing plates

Raetz

Laurent

Dehoux

et al. 2015

The Journal of the Acoustical Society of America

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Zero-group velocity (ZGV) Lamb modes are associated with sharp local acoustic resonances and allow, among other features, local measurement of Poisson's ratio. While the thermoelastic generation of Lamb waves in metal plates has been widely studied, the case of materials of low-optical absorption remains unexplored. In materials such as glasses, the generation of bulk elastic waves has been demonstrated to be sensitive to the refracted light distribution. In this paper, a detailed analysis of the effect of light refraction on the laser-based generation of ZGV Lamb modes is presented. Experiments are performed on a bare glass plate without the need for an additional layer for light absorption or reflection. Using an appropriate tilted volume source, it is shown that the laser-ultrasonic technique allows non-contact measurement of the Poisson's ratio.

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Elastic Response of Titanium Foams During Compression Tests and Using Laser‐Ultrasonic Probing

Cited by 8 publications

References 8 publications

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

Microstructure and Mechanical Properties of Reticulated Titanium Scrolls

Effective property estimates for heterogeneous materials with cocontinuous phases

Effect of refracted light distribution on the photoelastic generation of zero-group velocity Lamb modes in optically low-absorbing plates

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