Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites

Tarantino, M.G.; Weber, Ludger; Mortensen, Alicja

doi:10.1016/j.actamat.2016.06.052

Cited by 11 publications

(3 citation statements)

References 65 publications

(59 reference statements)

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“…In Figure 5a and Figure 5b increasing deviation from the average as the volume fraction of voided inclusions increases (see Figure 5b). The observed sensitivity for the measurements of the transverse strain at large volume fraction of inclusions is consistent with an earlier study on highly loaded particulate composites [54]. Moreover, data in Figure 5b display a small departure from the HS curve (here not a bound) for c ≥ 0.4.…”

Section: Experimental Results For the Effective Young's Modulus And Psupporting

confidence: 90%

Random 3D-printed isotropic composites with high volume fraction of pore-like polydisperse inclusions and near-optimal elastic stiffness

2019

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Highly porous materials with random closed-cell architecture combine isotropy with high stiffness. Yet in practice, the complexity of their manufacturing limits the experimental exploration of these materials, for which studies of the elastic response remain to date mainly theoretical. In this study, we measure experimentally the elastic moduli of random closed-cell porous-like composites fabricated by 3Dprinting. These materials contain a high volume fraction (up to 82 vol pct) of nonoverlapping, polydisperse void-like spherical inclusions, which are randomly dispersed in a homogeneous polymer matrix. We first generate the virtual microstructures of these materials using a random sequential adsorption (RSA) algorithm, and then use numerical homogenization to compute the size of the material representative volume element (RVE). The latter is used to assemble the test samples, whereby the void-like inclusions are 3D-printed using a gel-like polymer with mechanical properties that are in high contrast with those of the base polymer thus behaving mechanically as pores. Experiments reveal that the proposed isotropic

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Section: Experimental Results For the Effective Young's Modulus And Psupporting

confidence: 90%

Random 3D-printed isotropic composites with high volume fraction of pore-like polydisperse inclusions and near-optimal elastic stiffness

2019

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“…Among the fluoro-functionalized samples, the electropolished base surfaces exhibited the highest WCA followed by the ground series and the shot peened ones, respectively; these results are aligned with previous findings confirming the role of random microscale features (SP series) in promoting surface wettability. [17,34,35] It should also be considered that the magnitude of the surface roughness on the SP series was much higher compared to the G series (11.58 vs 0.59 in terms of R a for SP and G series, respectively). This remarkable roughness difference could have contributed to the distinctive WCA results between the SP-A-F-L/SP-B-F-L pair and G-A-F-L/G-B-F-L. Higher surface roughness within the same length scale could stimulate higher wettability.…”

Section: Surface Wettabilitymentioning

confidence: 99%

Directing Surface Functions by Inducing Ordered and Irregular Morphologies at Single and Two‐Tiered Length Scales

et al. 2020

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Surface characteristics are known as a major key able to finely tune an extensive list of material functions and interactions with the surrounding environment. The prominence of interface control has motivated the development of a wide variety of surface treatments, including chemical, physical, and mechanical surface modifications or synthetic coating deposition to tailor the surface properties. These techniques are able to generate regular (e.g., fractal) surfaces or disordered surface features (e.g., shot peened surfaces). Among all variations of surface morphologies, the strategies that induce hierarchical architecture, generally inspired by natural and biological materials, have gained much attention in recent years. Surface features at different length scales are found to be significantly effective in controlling interface characteristics, including corrosion, wear, scratch resistance, and the wetting properties of the surface. [1,2] A recent breakthrough in this field has been the development of the bio-inspired slippery liquid-infused porous (SLIP) coatings. [3-5] SLIPs consist in low-surface-energy nano/micro-structured coatings (generally Teflon) infused by a lubricating fluid that forms a continuous, and physically smooth slippery liquid interface exhibiting omniphobic (repelling both polar and apolar liquids) and antisticking characteristics. In SLIP systems, the role of the porous textured coating is to keep the lubricating film in place; [3] thus, it does not necessarily provide mechanical robustness and can limit the SLIP's applicability to coat mechanically functional surfaces. [6] To address this problem, metallic films, fabricated mostly using vapor or solution-based deposition techniques, were suggested to serve as the SLIPs lubricant containing coating. Tesler et al. [6] used electrochemical deposition

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“…In fact, cermets with high volume fractions of hard ceramic inclusions are more akin to a granular medium with a high cohesive strength rather than a typical particle-reinforced composite. For example, recent studies (Pickering et al, 2016;Tarantino et al, 2016) have demonstrated that the multi-axial yield response of cermets is not solely governed by the von-Mises stress. Rather, similar to granular materials, cermets dilate under compression and thus their strength is also dependent on the imposed hydrostatic pressure.…”

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confidence: 99%

Deformation mechanisms of idealised cermets under multi-axial loading

Bele

Goel

Pickering

et al. 2017

Journal of the Mechanics and Physics of Solids

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The response of idealised cermets comprising approximately 60% by volume steel spheres in a Sn/Pb solder matrix is investigated under a range of axisymmetric compressive stress states. Digital volume correlation (DVC) analysis of X-ray microcomputed tomography scans (μ-CT), and the measured macroscopic stress-strain curves of the specimens revealed two deformation mechanisms. At low triaxialities the deformation is granular in nature, with dilation occurring within shear bands. Under higher imposed hydrostatic pressures, the deformation mechanism transitions to a more homogeneous incompressible mode. However, DVC analyses revealed that under all triaxialities there are regions with local dilatory and compaction responses, with the magnitude of dilation and the number of zones wherein dilation occurs decreasing with increasing triaxiality. Two numerical models are presented in order to clarify these mechanisms: (i) a periodic unit cell model comprising nearly rigid spherical particles in a porous metal matrix and (ii) a discrete element model comprising a large random aggregate of spheres connected by non-linear normal and tangential "springs". The periodic unit cell model captured the measured stress-strain response with reasonable accuracy but under-predicted the observed dilation at the lower triaxialities, because the kinematic constraints imposed by the skeleton of rigid particles were not accurately accounted for in this model. By contrast, the discrete element model captured the kinematics and predicted both the overall levels of dilation and the simultaneous presence of both local compaction and dilatory regions with the specimens. However, the levels of dilation in this model are dependent on the assumed contact law between the spheres. Moreover, since the matrix is not explicitly included in the analysis, this model cannot be used to predict the stress-strain responses. These analyses have revealed that the complete constitutive response of cermets depends both on the kinematic constraints imposed by the particle aggregate skeleton, and the constraints imposed by the metal matrix filling the interstitial spaces in that skeleton.

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Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites

Cited by 11 publications

References 65 publications

Random 3D-printed isotropic composites with high volume fraction of pore-like polydisperse inclusions and near-optimal elastic stiffness

Random 3D-printed isotropic composites with high volume fraction of pore-like polydisperse inclusions and near-optimal elastic stiffness

Directing Surface Functions by Inducing Ordered and Irregular Morphologies at Single and Two‐Tiered Length Scales

Deformation mechanisms of idealised cermets under multi-axial loading

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