Drop weight impact behaviour of sandwich panels with metallic micro lattice cores

By R. Mines, S. Tsopanos, Y. Shen, R. Hasan, S. Mckown. 2013

247 citations recorded by the source corpus.

The paper addresses the low velocity, drop weight behaviour of small (100 mm by 100 mm) sandwich panels with CFRP skins. The main point of interest is the core material, and the focus of the paper is in the use of body centred cubic (BCC) micro lattice cores made from Ti 6Al 4V titanium alloy and 316L stainless steel manufactured using selective laser melting. The mechanical behaviour of the micro lattice core is compared to that of conventional aluminium honeycomb. The paper discusses the manufacture and characterisation of the core materials, the measurement of core properties from strut tensile tests, block compression tests and the drop weight impact performance of the panels. Impact performance is expressed in terms of panel penetration. It is shown that the current Ti 6Al 4V BCC micro lattice cores are competitive with aluminium honeycomb, but that there is scope for improvement in Ti 6Al 4V micro strut mechanical properties. The SLM manufacturing process gives lattice structures with open cell architecture, which is an advantage for aerospace applications, and the SLM process can be used to realise a variety of cell lattice geometries.

Subfields: Automotive Engineering, Mechanical Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/c43e337c84bf03c013cdbea91cce1d06fecad5c0

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In Automotive Engineering

In Mechanical Engineering

In Polymers and Plastics

Citations in the corpus

Effective design and simulation of surface-based lattice structures featuring volume fraction and cell type grading (2018, background): “Other properties of these structures that have attracted attention are their energy absorption under compressive and dynamic loading [1-5], their facility to act as heat exchangers [6,7], their applications in orthopaedic implants [8] and their potential to reduce noise and vibration transmission [9”
Lightweight sandwich structures for marine applications: a review (2021, background): “One of the most important crashworthiness parameter, eligible for comparison purposes, is the absorbed energy: in particular, the specific energy absorption (SEA), which is the ratio between the total absorbed energy (TEA) and the structure weight [89] or density [90] (according to Eq.”
A mechanical property evaluation of graded density Al-Si10-Mg lattice structures manufactured by selective laser melting (2016, background): “It is the long collapse plateau and its associated energy absorption that make lattice structures so compelling for use in impact absorbing applications[1, 4, 32, 33].”
Numerical investigation on mechanical properties of cellular lattice structures fabricated by fused deposition modeling (2014, methodology): “[30] manufactured and characterized BCC micro-lattices made from Ti6Al4V titanium alloy and 316 L stainless steel, as the core material for sandwich panels, using SLM.”