An introduction to topological field theory by Lawrence R.J.

By Lawrence R.J.

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A record for a member stores information about it: numeric and other tabular data for its properties, text, graphs and images to describe its use and applications. This structure forms the basis of computer-based selection systems of which the CES system is an example. It enables a unique way of presenting data for materials and processes as property charts, two of which appear in this chapter. They become one of the central features of the chapters that follow. F. and Johnson, K. (2002) Materials and Design—The Art and Science of Material Selection in Product Design, Butterworth-Heinemann, Oxford, UK.

Detailed design drawings for the lever of embodiment (b) are shown on the right. mechanical advantage—levered pull, geared pull and spring-assisted pull. The embodiments suggest the layout, the mechanisms and the scale. In the final, detailed, stage of design, the components are dimensioned so that they carry the working loads safely, their precision and surface finish are defined, and a final choice of material and manufacturing route is made as suggested on the right of the figure. Let us examine how this is done.

Information about materials is needed at each stage, but at very different levels of breadth and precision. The broken lines suggest the iterative nature of original design and the path followed in redesign. At the conceptual design stage, all options are open: the designer considers alternative concepts and the ways in which these might be separated or combined. The next stage, embodiment, takes the promising concepts and seeks to analyze their operation at an approximate level. This involves sizing the components and a preliminary selection of materials and processes, examining the implications for performance and cost.

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