Ashby Materials Selection in Mechanical Design – Fourth Edition

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Ashby Materials Selection in Mechanical Design – Fourth Edition

Ashby Materials Selection in Mechanical Design – Fourth Edition

Author : Michael F. Ashby
Book Details
Pages : 665
Size : 77 MB
Book Description

Materials influenced lives in Epictetus’ time and continue to do so today. In
his day, the number of materials was small; today it is vast. The opportunities
for innovation that materials offer now are equally immense. But advance is
possible only if a procedure exists for making a rational choice from the
materials on this great menu, and—if they are to be used—a way of identify-
ing ways to shape, join, and finish them. This book develops a systematic
procedure for selecting materials and processes, leading to the subset that
best matches the requirements of a design. It is unique in the way that the
information it contains has been structured. The structure gives rapid access
to data and allows the user great freedom in exploring potential choices. The
method is implemented in software* to provide greater flexibility.
The approach here emphasizes design with materials rather than materials
“science,” although the underlying science is used whenever possible to help
with the structuring of selection criteria. The first six chapters require little
prior knowledge: A first-year grasp of materials and mechanics is enough.
The chapters dealing with shape and multiobjective selection are a little
more advanced but can be omitted on a first reading. As far as possible, the
book integrates materials selection with other aspects of design; the relation-
ships with the stages of design and optimization and with the mechanics
of material, are developed throughout. At the teaching level, the book
is intended as a text for third- and fourth-year engineering courses on Mate-
rials for Design: A 6- to 10-lecture unit can be based on Chapters 1 through
6, 13, and 14; a full 20-lecture course, with project work using the asso-
ciated software, will require use of the entire book.
Beyond this, the book is intended as a reference of lasting value. The
method, the charts, and the tables of performance indices have application
in real problems of materials and process selection; and the table of data
and the catalog of “useful solutions” (Appendices A and B) are particularly
helpful in modeling—an essential ingredient in optimal design. The reader
can use the content (and the software) at increasing levels of sophistication
as his or her experience grows, starting with the material indices developed
in the book’s case studies and graduating to the modeling of new design
problems, leading to new material indices and penalty functions, as well as
new—and perhaps novel—choices of material. This continuing education
aspect is helped by the “Further readings” at the end of each chapter and
Appendix E—a set of exercises covering all aspects of the text. Useful refer-
ence material is assembled in Appendices A, B, C, and D.
As in any other book, the contents in this one are protected by copyright.
Generally, it is an infringement to copy and distribute materials from a
copyrighted source. However, the best way to use the charts that are a cen-
tral feature of the book, for readers to have a clean copy on which they can
draw, try out alternative selection criteria, write comments, and so forth;
presenting the conclusion for a selected exercise is often most easily done in
the same way. Although the book itself is copyrighted, instructors or readers
are authorized to make unlimited copies of the charts and to reproduce
these for teaching purposes, provided a full reference to their source is given.

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