They can be used to perform materials selection for new designs or to substitute a material in an already popular product. They can also be used to identify gaps where new materials would be useful. In GRANTA EduPack they are interactive and enable you to find out more about a property or material. First of all, they are beautiful and encourage exploration. These charts can be used in many different ways. The first chart above shows the different material families and how they group together. You will see that materials group together, with all the ceramics, for example, having similar values. This huge range is covered by using logarithmic (‘log’) scales, where each major step on the axes represents a factor of 10. The range of the axes on the charts is chosen to include all materials, from dense, stiff and strong metals like tungsten to light and flexible polymer foams. The materials are represented on the chart as ellipses or ‘bubbles’, whose width and height are determined by the range of the value of the properties. Each material has a range of values for each property, depending on the exact composition, grade, heat treatment, supplier etc. A useful method of doing this is by plotting them as Material Property Charts, sometimes called ‘bubble’ or ‘Ashby’ charts, with one property on one axis and another property on the other. We need a good way to display and compare them. There are a lot of materials, and each has a lot of properties.
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