6.0 - Introduction Flashcards
(36 cards)
What is defined by the “Strength of a Material”?
The relations between external forces applied to an elastic body and the deformations and internal stresses resulting from those applied forces
What is the unit of measurement for “Density”?
The density of an object is a measure of mass per unit volume and is measured in kg/m3.
Generally, for a given volume, the more dense an object is, the heavier it will be.
What is “Fatigue” of a material?
When a metal is subjected to cyclic loadings, it will start to crack. This type of failure is known as FATIGUE!
Where does Fatigue of a material usually start from?
Fatigue usually starts at a stress concentrator such as a scratch or sharp indentation and can rapidly increase.
What does the term “Elasticity” mean on a material?
A body is said to be perfectly elastic if, after it has been deformed by external forces, it returns completely to its original shape when the forces are removed.
What is the unit for Stress?
Newtons per square metre (N/m2) or Pascals (Pa)
How does Newtons per square metre (N/m2 differ from Pascals (Pa)
It doesn’t, both have equal value
What is combined stress?
Tensile & Shear
Compressive & Shear
What is simple stress?
When tensile, compressive or shearing stress act alone
What is Strain?
The amount of deformation of a dimension of a body resulting from the application of a load divided by the original dimension of the body.
What is Poisson’s Ratio?
The negative ratio of lateral strain to longitudinal unit strain for a given material subjected to uniform longitudinal stress within the proportional limit.
What Is Hardness of a material?
Resist to penetration, wear or cutting action.
What is Strength of a material?
Withstand forces which tend to deform the metal in any direction
What is Elasticity of a material?
The ability of an object or material to be stretched and recover its size and shape after deformation.
What is Plasticity of a material?
The property of a metal which allows it to be reshaped.
What is Ductility of a material?
The property which allows metal to be drawn into thinner sections without breaking.
What is Malleability of a material?
That characteristic of material that allows it to be stretched or shaped by beating with a hammer or passing through rollers without breaking.
What is Toughness of a material?
The property of a metal which allows it to be deformed without breaking.
What is Brittleness of a material?
The property of a metal to break when deformed or hammered. It is the resistance to change in the relative position of the molecules within the material.
What is conductivity of a material?
The characteristic of a material which makes it possible for it to transmit heat or electricity.
What is Durability of a material?
The property of metal that enables it to withstand force over a period of time.
What do Non-Ferrous metals not contain?
Iron
What do Metallic materials contain?
Metal
What is the yield strength, and where would you find it on the graph?
Maximum stress a material can take before going into the plastic limit. (First Curve on Graph)
