Chapter_9 - Chapter 9 Selection of Material and Shape...

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Chapter 9 Selection of Material and Shape Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby
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Section shape is important for certain modes of loading. When shape is a variable, a new term – the shape factor Φ – appears in some of the material indices. Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Figure 9.1
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Mechanical efficiency is obtained by combining material with macroscopic shape. The shape is characterized by the dimensionless shape factor Φ . Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Figure 9.2
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Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby
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The best material- shape combination depends on the mode of loading. Certain structural elements are specially designed to carry specific types of loads. Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Figure 9.3
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Elastic Bending of Beams The bending stiffness of a beam is proportional to the product EI Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Figure 9.4 Figure 9.4 shows the effect of shape on bending stiffness. A square-section beam compared: left , with a tube of the same area (but 2.5X stiffer); right , with a tube with the same stiffness (but 4X lighter).
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Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby
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Chapter_9 - Chapter 9 Selection of Material and Shape...

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