Chapter 4 Flashcards
As hardness of the material increases, how’s the strength of the material usually affected?
The strength is increased
Three important chemical properties of the metal
Hardness, ductility, strength
What type of strength indicates a material’s ability to resist being squeezed together
Compressive strength
What type of strength indicates a materials ability to resist shock?
Toughness or impact strength
What type of strength indicates materials ability to resist repeated loading
Fatigue strength or endurance strength
What type of strength indicates materials ability to with resist bending
Flexural strength
What type of strength indicates materials ability to resist sliding past?
Shear strength
If material does not stretch before breaks, it is described as
Brittle
Percent elongation is a good measure of what other mechanical property
Strain
Ratio of stress to strain for material
Modulus of elasticity
What point on the stress strain diagram occurs at the end of the elastic region
Elastic limit
How does temperature affect creep
Creepy slow at low temperatures but I temptress creepy become a serious problem
What type of string is calculated using Poisson’s ratio
Ratio of lateral strain to the strain in the loaded direction
A material that does not permit electricity to flow through the said to have a high electrical question
Resistance
What is thermal conductivity
The rate that he can travel across the material the higher the degree the faster the heat will travel
How metals act under stress
Mechanical properties
Tell metals react with the environment
Chemical properties
Physical properties
Mass, density, etc.
Force/area
Stress
Change of dimension/original dimension
Strain
Return to original dimensions
Elasticity
Ability to distort without breaking
Flexibility
Permanently deform without breaking
Plasticity
Formable into useful shapes
Malleability
Stress/strain (Young’s)
Modulus of elasticity
(Lateral strain/axial strain)(-1)
Poisson’s ratio
Slow plastic flow overtime
Creep
Proportional limit
Strain is proportional to stress straight line graph
Elastic limit
Beyond this point permit deformation takes place
Yield point
Strain increases with no increase in stress
Ultimate strength
Point where a change in x-sectional is occurring (necking)
Rupture strength
Failure occurs
Hardness
Resist penetration
Strength
Resist forces or loads
Brittleness
Little deformation before fracture
Great deformation before fracture
Ductility
Tensile strength
Pulling apart
Compressive strength
Squeezing together
shear strength
Sliding past
Torsional Strength
Twisting
Flexural strength
Bending
Fatigue strength
Repeated stress loading
Toughness
Shock or impact stress
Impact strength
Basically same as toughness
