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1. Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures

Description:

Architected cellular materials, such as lattice structures, offer potential for tunable mechanical properties for dynamic applications of energy absorption and impact mitigation. In this work, the static and dynamic behavior of polymeric lattice structures was investigated through experiments on octet-truss, Kelvin, and cubic topologies with relative densities around 8%. Dynamic testing was conducted via direct impact experiments (25–70 m/s) with high-speed imaging coupled with digital image correlation and a polycarbonate Hopkinson pressure bar. Mechanical properties such as elastic wave speed, deformation modes, failure properties, particle velocities, and stress histories were extracted from experimental results. At low impact velocities, a transient dynamic response was observed which was composed of a compaction front initiating at the impact surface and additional deformation bands whose characteristics matched low strain-rate behavior. For higher impact velocities, shock analysis was carried out using compaction wave velocity and Eulerian Rankine–Hugoniot jump conditions with parameters determined from full-field measurements.

Keyword:

Failure, Digital image correlation, Transient dynamic, Shock, Lattice structure, and Compaction

Subject:

Applied Science and Engineering

Creator:

Weeks, J. S. and Ravichandran, Guruswami

Owner:

n.sakthivel@jioinstitute.edu.in

Publisher:

Springer Nature

Location:

Switzerland

Language:

English

Date Uploaded:

21-03-2023

Date Modified:

21-03-2023

Date Created:

01-12-2022

Rights Statement Tesim:

In Copyright

License Tesim:

All rights reserved

Resource Type:

Article

Identifier:

10.1007/s40870-022-00359-2
2. Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures

Description:

Architected cellular materials, such as lattice structures, offer potential for tunable mechanical properties for dynamic applications of energy absorption and impact mitigation. In this work, the static and dynamic behavior of polymeric lattice structures was investigated through experiments on octet-truss, Kelvin, and cubic topologies with relative densities around 8%. Dynamic testing was conducted via direct impact experiments (25–70 m/s) with high-speed imaging coupled with digital image correlation and a polycarbonate Hopkinson pressure bar. Mechanical properties such as elastic wave speed, deformation modes, failure properties, particle velocities, and stress histories were extracted from experimental results. At low impact velocities, a transient dynamic response was observed which was composed of a compaction front initiating at the impact surface and additional deformation bands whose characteristics matched low strain-rate behavior. For higher impact velocities, shock analysis was carried out using compaction wave velocity and Eulerian Rankine–Hugoniot jump conditions with parameters determined from full-field measurements.

Keyword:

Transient dynamic, Failure, Shock, Compaction, Lattice structure, and Digital image correlation

Subject:

Material Science, Chemistry, and Chemical Engineering

Creator:

Weeks, J. S. and Ravichandran, G.

Owner:

n.sakthivel@jioinstitute.edu.in

Publisher:

Springer Nature

Location:

Switzerland

Language:

English

Date Uploaded:

11-02-2023

Date Modified:

16-02-2023

Date Created:

01-12-2022

Rights Statement Tesim:

In Copyright

License Tesim:

All rights reserved

Resource Type:

Article

Identifier:

10.1007/s40870-022-00359-2

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1. Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures

2. Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures

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