Materials_Selection - Handbook Engineering - Reminder •...

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1 Materials Selection Materials selection • Failure of design is often related to failure of the materials to perform intended function. • Designer must select materials from the thousands available. • Designer must anticipate all aspects of the service environment. Important Material Properties Short Term Stiffness • Damping coefficient Strength Fracture Resistance Hardness Service Temperature Range Thermal • Expansion • Conductivity Chemical Electrical, Optical, Magnetic Aesthetic – texture, feel •F r i c t i o n Long Term Corrosion/Oxidation Fatigue Wear, Erosion Creep Recycling •P r i c e Availability Density
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2 Materials Choices Selecting Materials M.F. Ashby Materials Selection In Mechanical Design Selection proceeds in a hierarchical way
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3 Choosing Materials
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Unformatted text preview: Handbook Engineering - Reminder • Many of the engineering decisions have been made for you in the form of codes and specifications. • ASME, CSA, UL, ASTM – e.g. Pressure vessels, piping, etc. are rated for a given pressure. • Codes specify the dimensions and sometimes materials that are acceptable for certain applications. Screening materials based on one property – e.g. modulus 4 Price/Availability • Low cost is a critical aspect of almost all designs. • Price fluctuates significantly. • Must consider assembly cost as well as raw material cost. Inexpensive materials Expensive materials Density Modulus 5 Strength Long Term Failure Modes • Corrosion/Oxidation • Fatigue • Wear, Erosion • Creep Fatigue time Stress 6 Creep/Stress Relaxation Conclusion • Designer required to choose the appropriate material for the job, considering both the initial performance AND possible long term failure modes....
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This note was uploaded on 04/17/2008 for the course ECE APS112 taught by Professor Weiss during the Spring '08 term at University of Toronto- Toronto.

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Materials_Selection - Handbook Engineering - Reminder •...

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