1. Materials Selection in Mechanical Design by M.F.Ashby MLZ430 Emrah Dolekcekic

2. Mechanical Design Mechanical components : - have mass - carry loads - conduct heat and electricity - exposed to wear and corrosion - are made of materials - have a shape - must be manufactured

3. Inter- relations

5. Evolution of Engineering Materials

6. The Design Process To develop a methodology for selecting materials and processes which is design led, i.e. the design uses as inputs the functional requirements of the design.

7. The design process

8. A technical system

9. A systems approach

10. Types of design Original design Adaptive or development design Variant design

11. Design Methodology

12. Function analysis

13. How to open a corked bottle ?

14. Working principles

15. Function structure and working principles of cork removers

16. Realisation

17. Conclusion Design is an iterative process It starts with a need statement The a concept is devised An embodiment is envisaged and detailed The embodiment is refined on the basis of ever more refined data

18. Engineering materials and their properties Classes of materials Intrinsic or atom related material properties Tailored or microstructure related properties Non-mechanical properties, such as cost

19. Engineering material families

20. Definition of properties in units Density (kg/m3) Elastic moduli (GPa) Fracture strength (MPa) Resilience (J/m3) Hardness (GPa) Toughness (MPa.m1/2) Loss coefficient (-) Thermal conductivity (W/mK)

21. Shapes of stress strain curves

22. Material properties (continued) Thermal diffusivity (m2/s) Specific heat (J/kg.K) CTE (K-1) Thermal Shock resistance Creep resistance Wear constant (Archard : W/A.P) Corrosion rate

23. MATERIAL SELECTION CHARTS (bar chart)

24. MATERIAL SELECTION CHART (Bubble chart)

25. Material Property Charts