The quasi-static and blast response of steel lattice structures

Smith, Matthew L.; Cantwell, W.J.; Guan, Zhongwei; Tsopanos, S.; Nurick, G.N.; Langdon, G.S.

doi:10.1177/1099636210388983

Cited by 98 publications

(47 citation statements)

References 17 publications

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“…Similar observations regarding surface finish have been made by several authors who have utilised SLM [6][7][8]. From these investigations it can be concluded that a number of factors including laser power, movement speed and scanning direction all contribute to characteristics of the completed part.…”

Section: Bon Designsupporting

confidence: 79%

Tailored ramp wave generation in gas gun experiments

Cotton

Chapman

Winter

et al. 2015

EPJ Web of Conferences

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Abstract. Gas guns are traditionally used as platforms to introduce a planar shock wave to a material using plate impact methods, generating states on the Hugoniot. The ability to deliver a ramp wave to a target during a gas gun experiment enables access to different regions of the equation-of-state surface, making it a valuable technique for characterising material behaviour. Previous techniques have relied on the use of multi-material impactors to generate a density gradient, which can be complex to manufacture. In this paper we describe the use of an additively manufactured steel component consisting of an array of tapered spikes which can deliver a ramp wave over ∼ 2 µs. The ability to tailor the input wave by varying the component design is discussed, an approach which makes use of the design freedom offered by additive manufacturing techniques to rapidly iterate the spike profile. Results from gas gun experiments are presented to evaluate the technique, and compared with 3D hydrodynamic simulations.

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Section: Bon Designsupporting

confidence: 79%

Tailored ramp wave generation in gas gun experiments

Cotton

Chapman

Winter

et al. 2015

EPJ Web of Conferences

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“…They observed a rate sensitivity of the yield strength of the lattice structures as well as an increase in the blast resistance of the lattice structures with increasing the yield strength. Smith et al [8] performed quasi-static and blast tests on additively manufactured lattice structures made of stainless steel 316L. They observed that there is significant increase in the lattice yield strength at high strain rates which improves the energy absorption of the lattices and makes them more capable of withstanding blast loads.…”

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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“…Little research so far was done on dynamic compression tests on lattice structures manufactured by SLM. Smith et al 21 have investigated the quasistatic and blast response of both BCCand BCC-Z type lattice structures. Their investigations show that the behavior of lattice structures is predictable and that the collapse mechanisms in blast response.…”

Section: State-of-the-artmentioning

confidence: 99%

Mechanical response of TiAl6V4 lattice structures manufactured by selective laser melting in quasistatic and dynamic compression tests

Merkt

Hinke

Bültmann

et al. 2014

Journal of Laser Applications

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This paper focusses on the investigation of the mechanical properties of lattice structures manufactured by selective laser melting using contour-hatch scan strategy. The motivation for this research is the systematic investigation of the elastic and plastic deformation of TiAl6V4 at different strain rates. To investigate the influence of the strain rate on the mechanical response (e.g., energy absorption) of TiAl6V4 structures, compression tests on TiAl6V4-lattice structures with different strain rates are carried out to determine the mechanical response from the resulting stress-strain curves. Results are compared to the mechanical response of stainless steel lattice structures (316L). It is shown that heat-treated TiAl6V4 specimens have a larger breaking strain and a lower drop of stress after failure initiation. Main finding is that TiAl6V4 lattice structures show brittle behavior and low energy absorption capabilities compared to the ductile behaving 316L lattice structures. For larger strain rates, ultimate tensile strength of TiAl6V4 structures is more than 20% higher compared to lower strain rates due to cold work hardening

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The quasi-static and blast response of steel lattice structures

Cited by 98 publications

References 17 publications

Tailored ramp wave generation in gas gun experiments

Tailored ramp wave generation in gas gun experiments

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

Mechanical response of TiAl6V4 lattice structures manufactured by selective laser melting in quasistatic and dynamic compression tests

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