Chapter_3 - Chapter 3 Engineering Materials and Their...

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Chapter 3 Engineering Materials and Their Properties Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby
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Material Selection It is not necessarily a material that we seek, but a certain profile of properties – the one that best meets the needs of the design Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby
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Menu of Engineering Materials The members of a material family have certain features in common: similar properties, similar processing routes, and, often, similar applications Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Figure 3.1
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Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Stiff – high E Hard Abrasion resistant Good high temperature strength Good corrosion resistance Brittle Ceramics Hard Corrosion resistant Electrically insulating Transparent Brittle – low K IC Glasses
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Materials Selection in Mechanical Design, 4th Edition, © 2010 Michael Ashby Light – low ρ Easily shaped High strength per unit weight (σ/ρ) Lack stiffness – low E (50X less than metals) Properties highly sensitive to temperature Polymers Elastomers Lack stiffness – low E (500 – 5000X less than metals) Able to retain initial shape after being stretched Relatively strong and tough
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