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Shape Matters: How the external geometry and material content of an enginee...
Thu 25 May 2017, 18:00 – 20:00 BST
Inaugural Professorial Lecture
Alison McMillan, Professor in Aerospace Technology
6pm Lecture (Drinks Reception from 5.30pm)
In the design of engineering components, it is necessary to verify that the design geometry is adequate to the duty. This requires an analysis of the component as a result of the loads and other conditions applied to it. Usually the material of the component is considered to be “elastic”. Here the relationship between loads and deformation is defined mathematically, based on Hooke’s Law. Under more exacting conditions, an applied load can cause permanent “plastic” deformation, or material failure. In Finite Element Analysis the material properties and the shape of the component are represented mathematically, with loads and displacement constraints applied to the component surface.
The as-manufactured component differs from the prescribed geometry, by at most the “tolerance”. There are two issues with that approach: firstly how to ensure that the Finite Element Analysis encompasses all possible dimensional variations; and secondly that typical components are not particularly smooth, and surface roughness has a character all of its own. Furthermore, almost all components contain flaws within the material, or the material property varies within the volume.
The work to be presented includes models of: surface roughness and its importance in component assessment; ultrasound wave propagation through solids, to detect material damage; and the manufacturing process of machining, to understand which parameters influence surface quality.
Alison McMillan is Professor in Aerospace Technology at Wrexham Glyndwr University. She previous worked for about fifteen years at Rolls-Royce plc, where she developed component capability acquisition strategies, and coordinated research programmes and collaborative projects with academic and other industry partners. She developed the recent composites capability strategy at its early stages, and went to do lead the composites methods research activities for geometric modelling, manufacturing, and stress and impact induced failure mechanism prediction. Since joining Wrexham Glyndwr University, she has been developing her research interests in stress and fatigue analysis of heterogeneous materials and components with non-smooth surfaces.
Alison is a Fellow of the Institute of Physics, the Institution of Mechanical Engineers and the Higher Education Academy, and is a Member of the Society for the Advancement of Material and Process Engineering. She engages with Science, Technology, Engineering and Mathematics (STEM) outreach and organises public seminars.
Open to all and are free to attend.