Visit Prof. Rossmanek

Prof. Rossmanek (second from the left) visited our group to discuss a possible collaboration between the University of Newcastle and the University of Applied Sciences Stralsund. Prof. Rossmanek has been driving the development of Formula SAE in Germany and will support img_20161206_125017this year’s event in Melbourne as a judge.

Visit Prof. Vesenjak

In the framework of an ongoing collaboration with the University of Maribor (Slovenia) Prof. Matej Vesenjak (on the right) visited our research team in November 2016. Work was focused on the dynamic testing of metallic foam material and the creation of an editorial for a special issue in Materials. matej

On the compressive behaviour of high porosity expanded Perlite-Metal Syntactic Foam (P-MSF)

Our paper entitled “On the compressive behaviour of high porosity expanded Perlite-Metal Syntactic Foam (P-MSF)” has been accepted for publication in the Journal of Alloys and Compounds 691 (2017) 690-697:

A high porosity Perlite-Metal Syntactic Foam (P-MSF) is produced by the pre-compaction of a packed bed of expanded perlite particles prior to counter gravity infiltration with molten aluminium. The density of the resulting high porosity (>70 vol%) syntactic foam is in the range of 0.72e0.98 g/cm3, depending on the particle pre-compaction pressure and the number of compaction steps. Compressive testing is carried out following the ISO 13314 standard to characterise the mechanical properties of this novel material. Furthermore, micro-computed tomography scans are performed in order to investigate its mesostructure. The geometrical analysis revealed that the densification procedure generates a porosity gradient in the direction of the compressive force. This gradient is found to affect the deformation mechanism and thus the mechanical properties of high porosity P-MSF.

Advanced Roadside Barrier System

Transurban’s Innovation Grant Scheme has enabled a new research Project focused on the development of Advanced Roadside Barrier Systems.

Conventional roadside safety barriers are used in large numbers and thus are optimized for cost efficiency. However, they do have significant limitations in situations that require high energy absorption, in particular in confined spaces. Examples are frontal impacts with stationary objects such as solid lane separators, tunnel emergency bays or bridge pillars. To address this shortcoming, the Project develops high-performance roadside safety barriers. A recently invented energy absorbing material, perlite-metal syntactic foam (P-MSF), will be optimized for kinetic energy absorption and integrated in these barrier systems.

More information can be found in the following media release: MR_TCL_announces_innovation_grant_recipients

On the mechanical properties of PLC–bioactive glass scaffolds fabricated via BioExtrusion

Our manuscript has been accepted in Materials Science and Engineering C 57 (2015) 288–293.

The paper addresses the mechanical characterization of polycaprolactone (PCL)–bioglass (FastOs®BG) composites
and scaffolds intended for use in tissue engineering. Tissue engineering scaffolds support the self-healing
mechanism of the human body and promote the regrowth of damaged tissue. These implants can dissolve
after successful tissue regeneration minimising the immune reaction and the need for revision surgery. However,
their mechanical properties should match surrounding tissue in order to avoid strain concentration and possible
separation at the interface. Therefore, an extensive experimental testing programme of this advanced material
using uni-axial compressive testing was conducted. Tests were performed at low strain rates corresponding to
quasi-static loading conditions. The initial elastic gradient, plateau stress and densification strain were obtained.
Tested specimens varied according to their average density and material composition. In total, four groups of
solid and robocast porous PCL samples containing 0, 20, 30, and 35% bioglass, respectively were tested. The addition
of bioglass was found to slightly decrease the initial elastic gradient and the plateau stress of the biomaterial
scaffolds.

 

On the thermal properties of expanded perlite – metallic syntactic foam

Our manuscript has been accepted for publication in the International Journal of Heat and Mass Transfer.

The paper addresses the thermal properties of syntactic metal foam made by embedding expanded perlite particles in A356 aluminium matrix. Lattice Monte Carlo (LMC) analyses are conducted to determine the thermal characterization of the foam. For increased accuracy, the complex geometry of the metallic foam is captured by micro-computed tomography imaging. Using the resulting detailed geometric models, the effective thermal conductivity tensor is computed with possible thermal anisotropy taken into consideration. The numerical results are verified by comparison with experimental measurements. To this end, an improved steady-state method is used to correct for thermal contact resistance. Furthermore, the effective heat capacity, average density and thermal diffusivity of perlite – metal syntactic foam are determined.

Free download link valid until September 14, 2015 http://authors.elsevier.com/a/1RQjK44xZnwsq