Dynamic collapse of metallic lattice structures

Program Code: 

Prof Paul Hazell (p.hazell@adfae.du.au); Dr Mahmud Ashraf (m.ashraf@adfa.edu.au)

Description of Work: 


Metallic lattice materials have shown promise for lightweight sandwich panels that provide protection against blast and shock propagation. However, little is known of their dynamic spall characteristics (when compressed) and their collapse under dynamic loading. Using a plate-impact technique, where a shock is imparted to the face-plate of a sandwich structure, the collapse of a cellular structure can be interrogated with the response of the structure being monitored in real-time using piezo-resistive gauges and Heterodyne velocimeter (Het-v) techniques (a laserbased Doppler-shift technique used to track velocities of surfaces or interfaces). 

In addition to the experimental approach summarised above, it is expected that a modelling approach will be adopted using LS DYNA to enhance our understanding of the physics of collapse with special attention given to micro-lattices. The novelty of this PhD research package will be to (a) optimise designs of cellular structures to maximise the energy absorption and shock mitigation; (b) enhance our understanding of the physics of lattice collapse; and (c) examine their failure characteristics when a tensile pulse is subsequently applied.

It is intended that new designs of blast mitigating structures will result.