Dynamic Behavior of Engineered Lattice Materials

Hawreliak, J.; Lind, Jonathan; Maddox, Brian; Barham, Matthew; Messner, Mark C.; Barton, Nathan R.; Jensen, Brian J.; Kumar, Mithilesh

doi:10.1038/srep28094

Cited by 63 publications

(31 citation statements)

References 17 publications

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“…More generally, understanding how the inherent properties of granular materials (initial porosity, grain morphology) may be tailored to produce a desired bulk performance or encourage/discourage reactions is of both fundamental and industrial scientific interest56.…”

mentioning

confidence: 99%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

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Chondritic meteorites are fragments of asteroids, the building blocks of planets, that retain a record of primordial processes. Important in their early evolution was impact-driven lithification, where a porous mixture of millimetre-scale chondrule inclusions and sub-micrometre dust was compacted into rock. In this Article, the shock compression of analogue precursor chondrite material was probed using state of the art dynamic X-ray radiography. Spatially-resolved shock and particle velocities, and shock front thicknesses were extracted directly from the radiographs, representing a greatly enhanced scope of data than could be measured in surface-based studies. A statistical interpretation of the measured velocities showed that mean values were in good agreement with those predicted using continuum-level modelling and mixture theory. However, the distribution and evolution of wave velocities and wavefront thicknesses were observed to be intimately linked to the mesoscopic structure of the sample. This Article provides the first detailed experimental insight into the distribution of extreme states within a shocked powder mixture, and represents the first mesoscopic validation of leading theories concerning the variation in extreme pressure-temperature states during the formation of primordial planetary bodies.

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mentioning

confidence: 99%

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Rutherford

Chapman

Derrick

et al. 2017

Sci Rep

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“…These delicate structures are not fully solid, and require advanced fabrication techniques171819. Existing experimental investigations focused more on their static mechanical properties1516171845 and shock responses21.…”

Section: Discussionmentioning

confidence: 99%

“…Many intriguing phenomena that were first discovered in electromagnetism, such as cloaking8910, negative refraction1112, super-resolution focusing1213, have been successfully demonstrated in thin plates. ‘Pentamode' metamaterials demonstrate extreme mechanical properties through intricate designs of strut frameworks1415161718192021. Ambitious projects also aim to reduce the destructive power of seismic waves222324.…”

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confidence: 99%

Polarization bandgaps and fluid-like elasticity in fully solid elastic metamaterials

Wang

et al. 2016

Nat Commun

103

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Elastic waves exhibit rich polarization characteristics absent in acoustic and electromagnetic waves. By designing a solid elastic metamaterial based on three-dimensional anisotropic locally resonant units, here we experimentally demonstrate polarization bandgaps together with exotic properties such as ‘fluid-like' elasticity. We construct elastic rods with unusual vibrational properties, which we denote as ‘meta-rods'. By measuring the vibrational responses under flexural, longitudinal and torsional excitations, we find that each vibration mode can be selectively suppressed. In particular, we observe in a finite frequency regime that all flexural vibrations are forbidden, whereas longitudinal vibration is allowed—a unique property of fluids. In another case, the torsional vibration can be suppressed significantly. The experimental results are well interpreted by band structure analysis, as well as effective media with indefinite mass density and negative moment of inertia. Our work opens an approach to efficiently separate and control elastic waves of different polarizations in fully solid structures.

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“…They also observed both the progressive damage and buckling-dominated modes of collapse in lattices with different architecture. Hawreliac et al [7] studied dynamic behavior of additively manufactured lattice structures under impact loading. Using in situ x-ray phase contrast imaging, they observed elastic wave propagation in the lattice structures for both bend and stretch dominated lattices.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static and dynamic behavior of additively manufactured metallic lattice cylinders

Sadeghi

Bhate

Abraham

et al. 2018

AIP Conference Proceedings

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Lattice structures have tailorable mechanical properties which allows them to exhibit superior mechanical properties (per unit weight) beyond what is achievable through natural materials. In this paper, quasi-static and dynamic behavior of additively manufactured stainless steel lattice cylinders is studied. Cylindrical samples with internal lattice structure are fabricated by a laser powder bed fusion system. Equivalent hollow cylindrical samples with the same length, outer diameter, and mass (larger wall thickness) are also fabricated. Split Hopkinson bar is used to study the behavior of the specimens under high strain rate loading. It is observed that lattice cylinders reduce the transmitted wave amplitude up to about 21% compared to their equivalent hollow cylinders. However, the lower transmitted wave energy in lattice cylinders comes at the expense of a greater reduction in their stiffness, when compared to their equivalent hollow cylinder. In addition, it is observed that increasing the loading rate by five orders of magnitude leads to up to about 36% increase in the peak force that the lattice cylinder can carry, which is attributed to strain rate hardening effect in the bulk stainless steel material. Finite element simulations of the specimens under dynamic loads are performed to study the effect of strain rate hardening, thermal softening, and the failure mode on dynamic behavior of the specimens. Numerical results are compared with experimental data and good qualitative agreement is observed.

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Dynamic Behavior of Engineered Lattice Materials

Cited by 63 publications

References 17 publications

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Probing the early stages of shock-induced chondritic meteorite formation at the mesoscale

Polarization bandgaps and fluid-like elasticity in fully solid elastic metamaterials

Quasi-static and dynamic behavior of additively manufactured metallic lattice cylinders

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