Kategorier: Alla - fatigue - corrosion - density - elasticity

av HENRY EGAI för 2 årar sedan

138

MATERIAL PROPERTIES & BEHAVIOUR

The text discusses various material properties and their behaviors under different conditions. Fatigue is highlighted as a significant factor in material failure, especially under repeated loading, as seen in bridges and bicycle pedals.

MATERIAL PROPERTIES & BEHAVIOUR

MATERIAL PROPERTIES & BEHAVIOUR

MATERIAL PROPERTIES AND BEHAVIOUR


CREEP

FACTOR AFFECTING CREEP
HEAT TREATMENT
GRAIN SIZE
COMPOSITION
TEMPERATURE
LOAD
THE TENDENCY OF A SOLID MATERIAL TO SLOWLY DEFORM PERMANENTLY UNDER THE INFLUENCE OF STRESSES
DEFINED AS THE SLOW & PROGRESSIVE DEFORMATION OF A MATERIAL WITH TIME AT CONSTANT STRESS

FATIGUE

THREE STAGES OF FATIGUE FAILURE
A SUDDEN FRACTURE OF THE MATERIAL OCCURS WHEN THE REMAINING CROSS-SECTION OF THE MATERIAL IS TOO SMALL TO SUPPORT THE APPLIED LOAD
THE CRACK GRADUALLY PROPAGATES AS THE LOAD CONTINUES TO CYCLE
SMALL CRACK INITIATED AT THE SURFACE AND CAN INCLUDE SCRATCHES,PITS,SHARP CORNERS DUE TO POOR DESIGNING & ETC
CRACKS GENERALLY GROW UNDER REPEATED LOADING TRUCKS PASSING OVER BRIDGES,BICYCLE PEDALS AND GEAR
LOWERING OF STRENGTH OR FAILURE OF A MATERIAL DUE TO REPETITIVE STRESS,WHICH MAY BE ABOVE OR BELOW THE YIELD STRENGTH
FAILURE UNDER CYCLIC STRESS

PHYSICAL &CHEMICAL PROPERTIES

MELTING POINT
DENSITY
CORROSION
MAGNETIC PROPERTIES

FRACTURE MECHANISM

BRITTLE FRACTURE
RAPID RUN OF CRACKS THROUGH A STRESSED MATERIAL
OCCURS WITH LITTLE OR NO PLASTIC DEFORMATION
DUCTILE FRACTURE
OCCURS WITH PLASTIC DEFORMATION

ELECTRICAL PROPERTIES

ELECTRICAL RESISTANCE
ELECTRICAL CONDUCTIVITY

THERMAL PROPERTIES

THERMAL STRESSES
THERMAL CONDUCTIVITY
THE ABILITYOF A MATERIAL TO TRANSPORT HEAT
THERMAL EXPANSION
HEAT CAPACITY
THE ABILITY TO ABSORB HEAT

MECHANICAL PROPERTIES

DUCTILITY
THE ABILITY OF A MATERIAL TO CHANGE SHAPE(DEFORM) USUALLY BY STRETCHING ALONG ITS LENGTH
PLASTICITY
THE ABILITY OF A MATERIAL TO BE CHANGE IN SHAPE PERMANENTLY
ELASTICITY
THE ABILITY OF A MATERIAL TO ABSORB FORCE AND FLEX IN DIFFRENT DIRECTION,RETURNING TO ITS ORIGINAL POSITION
HARDNESS
THE ABILITY OF A MATERIAL TO RESIST SCRACTCHING,WEAR AND TEAR AND INDENTION
BRITTLENESS
DISABILITY OF A MATERIAL TO UNDERGO PLASTIC DEFORMATION
TOUGHNESS
ABILITY OF A MATERIAL'S RESISTANCE TO FRACTURE.
STRENGTH
THE ABILITY OF A MATERIAL TO STAND UP TO FORCES BEING APPLIED WITHOUT IT BENDING,BREAKING SHATTERING OR DEFORMING