Just like home : suburban realities and the art of Lisa Hilli

This article profiles the work of Australian-based Tolai artist Lisa Hilli and her photographic, video, installation and performance-based arts practice. Hilli's work deals with contemporary Pacific diasporic identity in Australia.

The effect of skin passing on the material behavior of metal strip in pure bending and tension

The metal strip used in roll forming has often been preprocessed by (tension or roller) leveling or by skin-pass rolling, and as a consequence, may contain residual stresses. These stresses are not well observed by the tensile test, but could have a significant effect on the bending and springback behavior. With the advent of improved process design techniques for roll forming, including advanced finite element techniques, the need for precise material property data has become important. The major deformation mode of roll forming is that of bending combined with unloading and reverse bending, and hence property data derived from bend tests could be more relevant than that from tensile testing.

This work presents a numerical study on the effect of skin passing on the material behavior of stainless steel strip in pure bending and tension. A two dimensional (2-D) numerical model was developed using Abaqus Explicit to analyze the affect of skin passing on the residual stress profile across a section for various working conditions. The deformed meshes and their final stress fields were then imported as pre-defined fields into Abaqus Standard, and the post-skin passing material behavior in pure bending was determined. The results show that a residual stress profile is introduced into the steel strip during skin passing, and that its shape and stress level depend on the overall thickness reduction as well as the number of rolling passes used in the skin passing process. The material behavior in bending and the amount of springback changed significantly depending on the skin pass condition.

Characterising material and process variation effects on springback robustness for a semi-cylindrical sheet metal forming process

Variation in the incoming sheet material and fluctuations in the press setup is unavoidable in many stamping plants. The effect of these variations can have a large influence on the quality of the final stamping, in particular, unpredictable springback of the sheet when the tooling is removed. While stochastic simulation techniques have been developed to simulate this problem, there has been little research that connects the influence of the noise sources to springback. This paper characterises the effect of material and process variation on the robustness of springback for a semi-cylindrical channel forming operation, which shares a similar cross-section profile as many automotive structural components. The study was conducted using the specialised sheet metal forming package AutoForm^TM Sigma, for which a series of stochastic simulations were performed with each of the noise sources incrementally introduced. The effective stress and effective strain scatter in a critical location of the part was examined and a response window, which indicates the respective process robustness, was defined. The incremental introduction of the noise sources allows the change in size of the stressstrain response window to be tracked. The results showed that changes to process variation parameters, such as BHP and friction coefficient, directly affect the strain component of the stressstrain response window by altering the magnitude of external work applied to forming system. Material variation, on the other hand, directly affected the stress component of the response window. A relationship between the effective stressstrain response window and the variation in springback was also established.

Deformation and frictional heating in relation to wear in sheet metal stamping

In the automotive industry, press production rates often need to be reduced in order to minimize tool wear issues and successfully stamp advanced high strength steels. This indicates that heating affects may be important. This paper examines friction and deformational heating at the die radius during sheet metal stamping, using finite element analysis. The results show that high temperatures, of up to 130°C, can occur at the die radius surface. Such behavior has not been previously reported in the literature, for what is expected to be ‘cold’ sheet metal stamping conditions. It will be shown that the temperature rise is due to the increased contact stresses and increased plastic work, associated with stamping AHSS. Consequently, new insights into the local contact conditions in sheet metal stamping were obtained. The outcomes of this work may impact the wear models and tests employed for future tool wear analyses in sheet metal stamping.

Analytical solutions and finite element modelling of deep drawing process for cylindrical metal cups

Analytical modelling of deep drawing process is of value in preliminary process design to illustrate the influence of major variables including friction and strain hardening on punch loads, cup dimensions and process limits. In this study, analytical models including theoretical solution and a series of finite element models are developed to account for the influences of process parameters including friction coefficient, tooling geometry and material properties on deep drawing of metal cups. The accuracy of both the theoretical and finite element solutions is satisfactory compared with those from experimental work.

Biomechanical properties of porous metal scaffolds as implant materials

The results obtained from this work reveal that high porous titanium foams have fracture mechanical properties that meet and exceed the required properties of both cortical and cancellous bones. With their good biocompatibility, light weight, strong structural integrity and possibility of bone in-growth these foams are suitable for biomedical applications.

Alchemy & ambiguity : poetic responses to visual art, primarily portraiture

The author critiques the contemporary definition of poetry responding to art (the verbal representation of visual representation), and shows that this process is unstable and introduces changes, and by this means the visual work of art and the poem complement each other to influence the viewer/reader to produce new meanings.

Analytic study on pure bending of metal sheets

In this work, analytical models of pure bending are developed to simulate a particular type of bend test and to determine possible errors arising from approximations used in analyzing experimental data. Analytical models proposed for steels include a theoretical solution of pure bending and a series of finite element models, based on the von Mises yield function, are subjected to different stress and strain conditions. The results show that for steel sheets the difference between measured and calculated results of the moment-curvature behaviour is small and the numerical results from the finite element models indicate that experimental results obtained from the test are acceptable in the range of the pure bending operation. Further for magnesium alloys, which exhibit unsymmetrical yielding, the algorithm of the yield function with a linear isotropic hardening model is implemented by programming a user subroutine in Abaqus for bending simulations of magnesium. The simulations using the proposed user subroutine extract better results than those using the von Mises yield function.

Work

WORK functions as both performance and document. It demonstrates some of what training-practice within a hybrid arts practice might be and performatively places into action an investigation into solo work and multi art form collaboration.

The best of all worlds : immersive interfaces for art education in virtual and real world teaching and learning environments

A collaborative constructivist model of e-learning enabled second year undergraduate students and art educators to establish a community of learners within an augmented immersive learning environment. Artistic practice and work based learning was enhanced through the creation of digital artifacts to support shared knowledge building using authentic learning tasks and social networking.

Testimony, memory, and art at the Jewish Holocaust museum, Melbourne, Australia

Taking its cue from Charlotte Delbo’s powerful writing about the Holocaust in which she highlights the role of sense memories, this chapter begins with the proposition that sense memories – as distinct from narrative or vicarious forms of memory – are a particularly effective vehicle for the communication of past trauma in the present. The paper explores the potential value of this proposition for the display of objects in a Holocaust museum which are given meaning by the voices of the survivor community and their focus on the importance of testimony. The chapter undertakse an analysis of how the sense memories of survivors animate specific objects on display, exploring the ways in which these objects help the Museum to create a bridge between the survivor community and the wider general public (Auerhahn and Laub, 1990). I argue that built into that process there is a requirement that audiences listen in a manner that makes them a witness to past traumas. This listening process, I want to argue, offers not only an opportunity for healing on the part of survivors but also, following Simon (2005), the exchange of a ‘terrible gift’. That gift, I will suggest, places the visitor as a witness to past traumas and builds an ethical request that they should actively work against future genocides. Central to that possibility, I want to argue, is the way in which the process of witnessing a sense memory is an affective experience for the viewer leading to the potential production of empathy.

Recent developments in corrosion inhibitors based on rare earth metal compounds

Rare earth organic compounds can provide an environmentally safe and non-toxic alternative to chromates as corrosion inhibitors for some steel and aluminium applications. For steel lanthanum 4-hydroxy cinnamate offers corrosion protection and reduces the susceptibility to hydrogen embrittlement. Recent work has also indicated that it inhibits the corrosion of steel in environments containing high levels of carbon dioxide. For aluminium alloys, cerium diphenyl phosphate provides excellent corrosion inhibition in chloride environments, and reduces susceptibly to stress corrosion cracking. Furthermore, for both steel and aluminium alloys filiform corrosion can be suppressed when rare earth inhibitor compounds are added as pigments to polymer coatings. The levels of inhibition observed are thought to be due to synergistic effects between the rare earth and organic parts of these novel compounds, and are related to the various species that may be present in the complex chemical conditions that develop in solution close to a metal surface. This paper reviews some of the published research conducted by the group at Deakin University over recent years.

Appropriation in the name of art: is a quotation exception the answer?

The Australian Law Reform Commission is at present considering the scope of exceptions to copyright infringement. Its consideration will no doubt be influenced to some degree by the outcome in EMI Songs Australia Pty Ltd v Larrikin Music Publishing Pty Ltd (2011) 191 FCR 444; (2011) 90 IPR 50 which concerned the quotation of a musical phrase in a later musical work. This article addresses the problem of creative appropriations and the extent to which a quotation exception, consistent with Art 10 of the Berne Convention, should be incorporated into Australian law. In doing so it considers the practical application of such a quotation exception in European jurisdictions (most notably Germany) and suggests the form in which such an exception might be incorporated into Australian law.