Showing papers by "Andrej Atrens published in 2004"

Evaluation of the BEASY program using linear and piecewise linear approaches for the boundary conditions

Abstract: The boundary element method (BEM) was used to study galvanic corrosion using linear and logarithmic boundary conditions. The linear boundary condition was implemented by using the linear approach and the piecewise linear approach. The logarithmic boundary condition was implemented by the piecewise linear approach. The calculated potential and current density distribution were compared with the prior analytical results. For the linear boundary condition, the BEASY program using the linear approach and the piecewise linear approach gave accurate predictions of the potential and the galvanic current density distributions for varied electrolyte conditions, various film thicknesses, various electrolyte conductivities and various area ratio of anode/cathode. The 50-point piecewise linear method could be used with both linear and logarithmic polarization curves.

Graduate attributes in relation to curriculum design and delivery in a Bachelor of Materials Engineering Programme

Abstract: This paper presents a critical analysis of the Bachelor of Materials Engineering programme compared with the expectations of the Institution of Engineers Australia (IEAust) and of UQ. To set the scene, the graduate attributes are listed, the programme framework is presented and the educational culture and available facilities are described Then, the programme delivery is described; this includes an analysis of the learning opportunities that allow students to develop the graduate attributes. Finally, an assessment is made of programme outcomes relating to graduate attributes.

Stress corrosion cracking of rock bolts

Abstract: The aim of this research was to understand the Stress Corrosion Cracking (SCC) of rock bolts. The laboratory tests produced fracture surfaces similar to those from service. The fracture surface has the following types: TTS (Tearing Topography Surface) at the origin of the SCC, CIS (Corrugated Irregular Surface) and qMVC (quasi Micro Void Coalescence) at the interface with the final fast fracture. The experimental study elucidated the environmental conditions leading to rock bolt SCC, and was used to determine the threshold stress and the threshold potential. A hydrogen embrittlement mechanism is proposed.

Research directions in magnesium corrosion arising from the Wolfsburg Conference

Abstract: The study of the localized corosion of the current alloys is needed for a deeper understanding of their corrosion behavior. It is known that localized corrosion is the most common form of corrosion for magnesium alloys, but so far there are no mechanistic studies of this form of corrosion for magnesium alloys. In addition, it is necessary to understand the corrosion performance of existing alloys so that it is possible to make engineering decisions about their service performance.