PhD senimars

HDR completion seminar

 

Date:    Thursday, 22 June 2017

 

Venue:   Graduate Teaching Room R221, Ian Ross Building

 

1st Speaker:   Tegan McAnulty

 

Time:     14:00 – 14:45

Title:     Overcoming Challenges of Prototyping with Single Point Incremental Forming through Formability and Geometric Accuracy Analysis

Abstract:   While advances have been made in technologies that facilitate low-volume, fast-turnaround manufacture for some materials (e.g. plastics and 3D printing), other materials such as sheet metal have not yet benefited. However, promise lies in single point incremental forming (SPIF), a technique which can form sheet material, including sheet metal, using little to no custom tooling. This project aimed to overcome some of the challenges that technicians still face in order to produce a component or prototype quickly and with minimal trial-and-error iterations. Firstly, studies about the formability of SPIF were carried out. Secondly, innovative forming tools were investigated in the context of how their shape might affect the geometric accuracy. Useful outcomes include understanding the interactions between certain parameters which severely compromise the success of the part and should therefore be avoided. Regarding forming tools and geometric accuracy, the following new observation is presented: depending on the choice of flat or hemispherical forming tools, there is a trade-off between undesirable bulging which occurs in the flat walls of a component, and bulging which occurs in the base.

 

2nd Speaker:   Brendan Moloney

 

Time:     14:45 – 15:30

Title:     Using System Dynamics modelling to understand the influences on Australian recycling rates plateauing below full potential.

Abstract:   Recycling rates in Australia and other developed economies are plateauing below their full potential. Plateauing recycling rates below full potential indicate an inefficient use of manufactured material and a lack in progress in treating the problem.  This project aimed to identify the major influences on recycling plateaus and provide policy suggestions for improving recycling rates. Case studies were carried out on Old Newspaper (ONP) and Municipal Solid Waste (MSW), both of which are experiencing recycling rate plateaus.

The analysis of ONP recycling rates was performed using Australian kerbside recycling coverage figures, demographic data, ONP economic influences and ONP waste flows. Results from analysis of ONP recycling rates indicated a supply side issue, limiting the growth of recycling rates.  The supply issues related to inadequate MSW separation. The analysis of MSW recycling plateaus used data derived from four sources; (a) waste weighbridges, (b) a waste audit, (c) a household survey, and (d) the 2011 census data. Analysis of this data indicated that consumption trends have a dominant effect on recycling rate levels, determining the full potential of recycling rates.  Consumption trends were found to vary significantly within a council area. Further analysis found that disposal knowledge levels and bin biases determined the gap between full potential and actual recycling rates.  

It was determined that existing recycling policy (e.g. council waste education)  has kept recycling rates stable, but will not lead to future recycling growth. The policies with the most potential to increase recycling rate levels involve updating recycling infrastructure or influencing consumption trends. An example of an influential change to recycling infrastructure being the inclusion of additional materials in the recycling stream (e.g. organic waste). Influential changes to consumption trends include changes to packaging regulation, with clear identification of recyclable and non-recyclable packaging.

 

 

3rd Speaker:   Vi Kie Soo

 

Time:     15:30 – 16:15

Title:     Life Cycle Impact of Different Joining Decisions on Vehicle Recycling

Abstract:   Stricter vehicle emission legislation has driven the significant reduction of carbon dioxide emissions during the vehicle use phase. This is achieved through the increasing use of lightweight materials and multi-material concepts to reduce the vehicle mass. To account for the complexity of multi-material vehicle designs, the choice of joining techniques used is becoming more diverse. Moreover, the different material combinations, and their respective joining methods play an important role in determining the potential of full material recycling in a closed-loop system.

This thesis evaluates the types of joining technologies used in the automotive industry, and identifies those that hinder end-of-life vehicle (ELV) recycling based on industrial trials carried out in Australia and Europe. Through the case studies, observations on the characteristics of joints that lead to impurities and valuable material losses for different recycling processes are examined. Life cycle analysis is performed highlighting the presence of impurities during ELV recycling phase that is not well captured in current studies. The System Dynamics approach is then used to illustrate the gap between the changing vehicle designs and the long-term effects on material recycling from the life cycle perspective. Based on the observations from case studies, the dynamic behaviour of the vehicle recycling systems can be described using two widely known system archetypes: “Fixes that Fail” and “Shifting the Burden”.

Date & time

2–4.15pm 22 Jun 2017

Location

Room:Graduate Teaching Room R221

Internal speakers

Tegan McAnulty
Mr Brendan Moloney
Dr Vi Kie Soo

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