the mystery of life is not a problem to be solved, but a reality to be experienced

The mystery of life is not a problem to be solved, but a reality to be experienced

- Meditations from Buddislamic Text

Mechanical properties

Tensile testHardnessToughness Fracture toughnessFatigue testCreep resistance

Tensile test

Yield strengthTensile strengthDuctility

Tensile test

Yield strengthTensile strengthDuctility

QuickTime™ and aCinepak decompressor

are needed to see this picture.

Tensile test

Yield strengthTensile strengthDuctility

QuickTime™ and aCinepak decompressor

are needed to see this picture.

Tensile test

Yield strengthTensile strengthDuctility

Tensile test

Yield strengthTensile strengthDuctility

Yield (ksi) Tensile (ksi) Elongation

Steels 30-250 60-250 65-2 %

For metals:

in general, increase strength, decrease ductility

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

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

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

Thermoplastics - 1-12 5-1000

Thermosetting - 5-25 0

Hardness

Resistance to indentation

Hardness

Resistance to indentation

Greater hardnessgives higherhardness nos.

Example - quenched plain carbon steels

Correlation betwn strength & hardnessHarder means stronger for metals &

alloys

Toughness

Resistance to being clobbered

Toughness

Resistance to being clobbered

Impact test measures energy absorbed upon fracture

measure of toughness

Toughness

Resistance to being clobbered

QuickTime™ and aCinepak decompressor

are needed to see this picture.

Impact test

measure impact energy at differenttemperatures

Impact test

measure impact energy at differenttemperatures

Impact test

measure impact energy at differenttemperatures

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)