SOLUSION MANUAL FOR MATERIALS
SELECTION IN MECHANICAL DESIGN 6TH
EDITION BY MICHAEL F. ASHBY (AUTHOR)
,Contents E1. Introduction to exercises
E2 Material evolution in products (Chapter 1)
E3. Devising concepts (Chapter 2)
E4. Using material properties (Chapter 3)
E5. Using material selection charts (Chapter 4)
E6. Translation: constraints and objectives (Chapters 5 and 6)
E7. Deriving and using material indices (Chapters 5 and 6)
E8. Multiple constraints and objectives (Chapters 7 and 8)
E 9. Selecting material and shape (Chapters 9 and 10)
E10. Hybrid materials (Chapters 11 and 12)
E11. Selecting processes (Chapters 13 and 14)
E12. Materials and the environment (Chapter 15)
E1 Introduction to exercises
These exercises are designed to develop facility in selecting materials, processes and shape, and in
devising hybrid materials when no monolithic material completely meets the design requirements.
Each exercise is accompanied by a worked solution. They are organized into the twelve sections listed on
the first page.
3.
correctly answered by listing the subset of
,materials that maximize this index. But a request for a selection of materials for a component – a wing
spar, for instance (which is a
) – requires
The early exercises are easy. Those that follow lead the reader through the use of material properties
and simple solutions to mechanics problems, drawing on data and results contained in Appendices A
and B; the use of material property charts; techniques for the translation of design requirement to
identify constraints and objectives; the derivation of indices, screening and ranking, multi- objective
optimization; coupled choice of material and shape; devising hybrids; and the choice of materials to
meet environmental criteria.
Three important points.
1. Selection problems are open-ended and, generally, under- specified; there is seldom a single,
correct answer. The proper answer is sensible translation of the design requirements into material
constraints and objectives, applied to give a short-list of potential candidates with commentary
suggesting what supporting information would be needed to narrow the choice further.
2. The positioning of selection-lines on charts is a matter of judgement. The goal is to place the
lines such that they leave an adequately large "short list" of candidates (aim for 4 or so), drawn, if
possible, from more than one class of material.
is a poor answer that ignores common sense and experience and fails to add further
constraints to incorporate them. Students should be encouraged
to discuss the implications of their selection and to suggest further selection stages.
The best way to use the charts that are a feature of the book is to make clean copies (or down-load
them from http://www.grantadesign.com ) on which you can draw, try out alternative selection criteria,
write comments and so forth. Although the book itself is copyrighted, the reader is authorized to make
copies of the charts and to reproduce these, with proper reference to their source, as he or she wishes.
, All the materials selection problems can be solved using the CES EduPack software, which is particularly
effective when multiple criteria and unusual indices are involved.
E2 Material evolution in products (Chapter 1)
E 2.1. Use Google to research the history and uses of one of the following materials
Tin
Glass
Cement
Titanium
Carbon fiber
Present the result as a short report of about 100 - 200 words (roughly half a page).
Specimen answer: tin. Tin (symbol Sn), a silver-white metal, has a long history. It was traded in the
civilisations of the Mediterranean as early as 1500 BC (the Old Testament of the Christian bible contains
many references to it). Its importance at that time lay in its ability to harden copper to give bronze
(copper containing about 10% tin), the key material for weapons, tools and statuary of the Bronze age
(1500 BC – 500 BC). Today tin is still used to make bronze, for solders and as a corrosion resistant
coating on steel sheet (“tin plate” ) for food and drink containers – a “tinnie”, to an Australian, is a can
of beer. Plate glass is made by floating molten glass on a bed of liquid tin (the Pilkington process). Thin
deposits of tin compounds on glass give transparent, electrically conducting coatings used for frost-free
windshields and for panel lighting.
E2.2 Research, at the level of the mini case studies in this chapter, the evolution of material use in
• Writing implements (charcoal, “lead” (graphite), quill pens, steel nib pens, gold plus osmium
pens, ball points..)
• Watering cans (wood – galvanized iron – polypropylene)
• Bicycles (wood – bamboo – steel, aluminum, magnesium, titanium – CFRP)
• Small boat building (wood – aluminum – GFRP)
SELECTION IN MECHANICAL DESIGN 6TH
EDITION BY MICHAEL F. ASHBY (AUTHOR)
,Contents E1. Introduction to exercises
E2 Material evolution in products (Chapter 1)
E3. Devising concepts (Chapter 2)
E4. Using material properties (Chapter 3)
E5. Using material selection charts (Chapter 4)
E6. Translation: constraints and objectives (Chapters 5 and 6)
E7. Deriving and using material indices (Chapters 5 and 6)
E8. Multiple constraints and objectives (Chapters 7 and 8)
E 9. Selecting material and shape (Chapters 9 and 10)
E10. Hybrid materials (Chapters 11 and 12)
E11. Selecting processes (Chapters 13 and 14)
E12. Materials and the environment (Chapter 15)
E1 Introduction to exercises
These exercises are designed to develop facility in selecting materials, processes and shape, and in
devising hybrid materials when no monolithic material completely meets the design requirements.
Each exercise is accompanied by a worked solution. They are organized into the twelve sections listed on
the first page.
3.
correctly answered by listing the subset of
,materials that maximize this index. But a request for a selection of materials for a component – a wing
spar, for instance (which is a
) – requires
The early exercises are easy. Those that follow lead the reader through the use of material properties
and simple solutions to mechanics problems, drawing on data and results contained in Appendices A
and B; the use of material property charts; techniques for the translation of design requirement to
identify constraints and objectives; the derivation of indices, screening and ranking, multi- objective
optimization; coupled choice of material and shape; devising hybrids; and the choice of materials to
meet environmental criteria.
Three important points.
1. Selection problems are open-ended and, generally, under- specified; there is seldom a single,
correct answer. The proper answer is sensible translation of the design requirements into material
constraints and objectives, applied to give a short-list of potential candidates with commentary
suggesting what supporting information would be needed to narrow the choice further.
2. The positioning of selection-lines on charts is a matter of judgement. The goal is to place the
lines such that they leave an adequately large "short list" of candidates (aim for 4 or so), drawn, if
possible, from more than one class of material.
is a poor answer that ignores common sense and experience and fails to add further
constraints to incorporate them. Students should be encouraged
to discuss the implications of their selection and to suggest further selection stages.
The best way to use the charts that are a feature of the book is to make clean copies (or down-load
them from http://www.grantadesign.com ) on which you can draw, try out alternative selection criteria,
write comments and so forth. Although the book itself is copyrighted, the reader is authorized to make
copies of the charts and to reproduce these, with proper reference to their source, as he or she wishes.
, All the materials selection problems can be solved using the CES EduPack software, which is particularly
effective when multiple criteria and unusual indices are involved.
E2 Material evolution in products (Chapter 1)
E 2.1. Use Google to research the history and uses of one of the following materials
Tin
Glass
Cement
Titanium
Carbon fiber
Present the result as a short report of about 100 - 200 words (roughly half a page).
Specimen answer: tin. Tin (symbol Sn), a silver-white metal, has a long history. It was traded in the
civilisations of the Mediterranean as early as 1500 BC (the Old Testament of the Christian bible contains
many references to it). Its importance at that time lay in its ability to harden copper to give bronze
(copper containing about 10% tin), the key material for weapons, tools and statuary of the Bronze age
(1500 BC – 500 BC). Today tin is still used to make bronze, for solders and as a corrosion resistant
coating on steel sheet (“tin plate” ) for food and drink containers – a “tinnie”, to an Australian, is a can
of beer. Plate glass is made by floating molten glass on a bed of liquid tin (the Pilkington process). Thin
deposits of tin compounds on glass give transparent, electrically conducting coatings used for frost-free
windshields and for panel lighting.
E2.2 Research, at the level of the mini case studies in this chapter, the evolution of material use in
• Writing implements (charcoal, “lead” (graphite), quill pens, steel nib pens, gold plus osmium
pens, ball points..)
• Watering cans (wood – galvanized iron – polypropylene)
• Bicycles (wood – bamboo – steel, aluminum, magnesium, titanium – CFRP)
• Small boat building (wood – aluminum – GFRP)
