1. The mystery of life is not a problem to be solved, but a reality to be experienced - Meditations from Buddislamic Text The mystery of life is not a problem to be solved, but a reality to be experienced - Meditations from Buddislamic Text

2. Mechanical properties Tensile test Hardness Toughness Fracture toughness Fatigue test Creep resistance Tensile test Hardness Toughness Fracture toughness Fatigue test Creep resistance

3. Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

4. Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

5. Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

6. Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

7. Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

8. Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % For metals: in general, increase strength, decrease ductility For metals: in general, increase strength, decrease ductility

9. Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5

10. Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Ceramics are..........? Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Ceramics are..........?

11. Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Brittle does not mean weak Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Brittle does not mean weak

12. Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Thermoplastics - 1-12 5-1000 Thermosetting - 5-25 0 Yield (ksi) Tensile (ksi) Elongation Steels 30-250 60-250 65-2 % Al alloys 5-80 13-90 45-4 Ni alloys 15-170 50-210 60-5 Ceramics - 20-380 0 Thermoplastics - 1-12 5-1000 Thermosetting - 5-25 0

13. Hardness Resistance to indentation Hardness Resistance to indentation

14. Hardness Resistance to indentation Greater hardness gives higher hardness nos. Hardness Resistance to indentation Greater hardness gives higher hardness nos.

15. Example - quenched plain carbon steels

16. Correlation betwn strength & hardness Harder means stronger for metals & alloys Correlation betwn strength & hardness Harder means stronger for metals & alloys

17. Toughness Resistance to being clobbered Toughness Resistance to being clobbered

18. Toughness Resistance to being clobbered Impact test measures energy absorbed upon fracture measure of toughness Toughness Resistance to being clobbered Impact test measures energy absorbed upon fracture measure of toughness

19. Toughness Resistance to being clobbered Toughness Resistance to being clobbered

20. Impact test measure impact energy at different temperatures Impact test measure impact energy at different temperatures

21. Impact test measure impact energy at different temperatures Impact test measure impact energy at different temperatures

22. Impact test measure impact energy at different temperatures Impact test measure impact energy at different temperatures

23. Assignments for next class: 1. review today's classnotes; know tensile test & what data obtained, hardness test, impact test 2. Do problems previously assigned on ANGEL (use Matweb for data) Assignments for next class: 1. review today's classnotes; know tensile test & what data obtained, hardness test, impact test 2. Do problems previously assigned on ANGEL (use Matweb for data)