INTRODUCTION TO MECHANICAL ENGINEERING

CHAPTER 5MATERIALS AND STRESSES

PROF DR J.IDRIS

FAILURE OF TITANIC ON HITTING THE ICEBURG

PICTURES WERE TAKEN BY THE COLUMBIA EXPLOSION FROM AN ISRAELI SATELLITE IN SPACE

CLASSIFICATION OF MATERIALS

METALS CLASIFICATION

NON-METALS CLASSIFICATION

FERROUS MATERIALS

STEELS AND CAST IRON

CARBON STEELS AND THEIR CLASSIFICATION

TYPES OF CARBON STEEL

TYPES OF CARBON STEEL

WROUGHT IRON

CAST IRON

TYPES OF CAST IRON

PROPERTIES OF GREY CAST IRON

WHITE CAST IRON

NODULAR CAST IRON

ALLOY STEELS

ALLOY STEELS

STAINLESS STEELS

TOOL STEEL

HIGH SPEED STEEL (HSS)

NON-FERROUS METALS

ADVANTAGES OF NON-FERROUS METALS

DISADVANTAGES OF NON-FERROUS METALS

COPPER

ZINC

TIN

MAGNESIUM

LEAD

ALUMINIUM

NICKEL

BRASS AND BRONZE

COMPOSITE MATERIALS

CLASSIFICATION OF COMPOSITE MATERIALS

PROPERTIES AND ADVANTAGES OF COMPOSITES

DISADVANTAGES OF COMPOSITES

APPLICATION OF COMPOSITES

STRESSES

Stress and Strain Relatonships

TENSILE TEST

Tensile test specimen

Tensile test sequence

ENGINEERING STRESS

Engineering strain

TYPICAL ENGINEERING STRESS-STRAIN PLOT

Elastc region in stress strain curve

YIELD POINT IN STRESS STRAIN CURVE

Plastc region in stress strain curve

TENSILE STRENGTH IN STRESS-STRAIN CURVE

DUCTILITY IN TENSILE TEST

TRUE STRESS

TRUE STRAIN

True stress-strain curve

STRAIN HARDENING IN STRESS-STRAIN CURVE

TRUE STRESS-STRAIN IN LOG-LOG PLOT

FLOW CURVE

CATEGORIES IN STRESS-STRAIN RELATIONSHIP :PERFECTLY ELASTIC

STRESS-STRAIN RELATIONSHIP: ELASTIC AND PERFECTLY PLASTIC

STRESS-STRAIN RELATIONSHIP: ELASTIC AND STRAIN HARDENING

TESTING OF BRITTLE MATERIALS

BENDING TEST

TESTING OF BRITTLE MATERIALS

TRANSVERSE RUPTURE STRENGTH

SHEAR PROPERTIES

SHEAR STRESS AND STRAIN

TORSION STRESS-STRAIN CURVE

SHEAR ELASTIC STRESS-STRAIN RELATIONSHIP

SHEAR PLASTIC STRESS-STRAIN RELATIONSHIP

SHEAR STRESS

SHEAR RATE

THANK YOUPROF DR J.IDRIS