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.

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MECHANICAL PROPERTIES OF MATERIALS

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Presentation transcript:

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

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

Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

Tensile test Yield strength Tensile strength Ductility Yield strength Tensile strength Ductility

Yield (ksi) Tensile (ksi) Elongation Steels % Yield (ksi) Tensile (ksi) Elongation Steels % For metals: in general, increase strength, decrease ductility For metals: in general, increase strength, decrease ductility

Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys

Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Ceramics are ? Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Ceramics are ?

Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Brittle does not mean weak Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Brittle does not mean weak

Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Thermoplastics Thermosetting Yield (ksi) Tensile (ksi) Elongation Steels % Al alloys Ni alloys Ceramics Thermoplastics Thermosetting

Hardness Resistance to indentation Hardness Resistance to indentation

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

Example - quenched plain carbon steels

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

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

Toughness Resistance to being clobbered Toughness Resistance to being clobbered

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

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

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

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)