Materials Selection in Mechanical Design by Michael F. Ashby

Author:Michael F. Ashby [Ashby, Michael F.]
Language: eng
Format: azw3, pdf
ISBN: 9780081006108
Publisher: Elsevier Science
Published: 2016-09-22T16:00:00+00:00

and that halving the mass is perceived to be worth twice the cost.

Fig. 8.7 shows the relative trade-off plot, here on linear scales. The axes are and . The material currently used in the application appears at the coordinates (1,1). Solutions in quadrant A are both lighter and cheaper than the existing material, those in quadrant B are cheaper but heavier, those in C are lighter but more expensive, and those in D are uninteresting. Contours of Z* can be plotted onto the figure. The contour that is tangent to the relative trade-off surface again identifies the optimum search area. As before, when logarithmic scales are used the contours of Z* become curves. Some of the case studies of Chapter 9, Multiple Constraints and Conflicting Objectives – Case Studies make use of relative penalty functions.

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