Our manuscript Large-scale drop test on perlite–metal syntactic foam has been accepted for publication in the Journal of Composite Materials.
Abstract Perlite–metal syntactic foam is a low-cost cellular metal intended for use in automotive impact protection. To test the viability of the material a 2.5 ton drop test was conducted. Impact mass and energy were selected to replicate the conditions of a frontal impact between a large passenger vehicle and a crash cushion. A hollow syntactic foam cylinder was manufactured to decelerate the drop weight in a controlled manner. Accelerometers and high-speed imaging were utilized to evaluate the performance of the energy absorbing element.
Born out of teaching MECH3760, the newest best-seller has been accepted for publication. The article can be downloaded free of charge until 15.08.2018 – enjoy.
Abstract: This paper presents a simulation software initially developed by the author for educational purposes. The computational tool supports the design of power systems with large penetration by renewable energy sources. In particular, the problematic of power intermittency and its counter strategies are targeted. The main innovation of this simulation is the detailed transient analysis of the essential balance between power generation and consumption. Even so, the focus of the simulation tool is simple usage and interpretation of results, it successfully captures important characteristics of renewable power systems. The user selects the composition of a power system from conventional power plants, photovoltaic, windpower and tidal power. Following system definition, power generation and power demand are calculated based on local weather data. Energy storage can be added to balance mismatches between power demand and supply. Following the completion of a simulation system autonomy, carbon emission and electricity cost are evaluated to assess the performance of energy systems.
Our new article Effects of particle size on the microstructure and mechanical properties of expanded glass-metal syntactic foams has been published in MSEA. For the next 50 days, the manuscript can be downloaded for free.
The effect of particle size on the microstructure and mechanical properties of expanded glass-metal syntactic foams (EG-MSF) was investigated. The foams were fabricated via counter gravity infiltration of a packed bed of recycled expanded glass (EG) particles. The metallic matrix of all foam samples was A356 aluminium. Different particle sizes were considered, i.e. diameters between 1–1.4, 2–2.8 and 4–5.6 mm. The microstructures of EG-MSF were investigated by optical and scanning electron microscopy and the grain size of the aluminium alloy was found to increase with EG particle size. Uni-axial compression testing of EG-MSF indicated that its mechanical properties depend both on foam density and particle size. Smaller particles were found to dampen plateau stress oscillation and improve the energy absorption characteristics of EG-MSF.
Our research on metal matrix syntactic foams with expanded glass particles has been published in Materials (PDF version).
Abstract Metal matrix syntactic foams have been fabricated via counter-gravity infiltration of a packed bed of recycled expanded glass particles (EG) with A356 aluminum alloy. Particle shrinkage was studied and has been utilized to increase the particles’ strength and tailor the mechanical properties of the expanded glass/metal syntactic foam (EG-MSF). The crushing strength of particles could be doubled by shrinking them for 20 min at 700 ◦C. Owing to the low density of EG (0.20–0.26 g/cm^3), the resulting foam exhibits a low density (1.03–1.19 g/cm^3 ) that increases slightly due to particle shrinkage. Chemical and physical analyses of EG particles and the resulting foams were conducted. Furthermore, metal syntactic foam samples were tested in uni-axial compression tests. The stress-strain curves obtained exhibit three distinct regions: elastic deformation followed by a stress plateau and densification commencing at 70–80% macroscopic strain. Particle shrinkage increased the mechanical strength of the foam samples and their average plateau stress increased from 15.5 MPa to 26.7 MPa.
In June 2017 we have successfully tested a P-MSF impact module. A 2.5 ton drop test was conducted to replicate conditions encountered in an automotive impact. The work has been supported by Transurban with an Innovation Grant.
P-MSF, a novel material invented and developed by our research group was used to manufacture a cylindrical crash element. Its controlled deformation allowed to safely arrest a 2.5 ton concrete block released from an elevation of 5 meters. A short video of the Project can be found below.
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 this year’s event in Melbourne as a judge.
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.
Our successful work on energy absorbing materials has attracted the Newcastle Innovation award. Further details can be found here.
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.
I had the honor to present a paper at the conference focusing on Materials for the 21st Century: From design to application. A video of the presentation can be found online (1st talk in Session 3)