Podcast
Questions and Answers
Which mechanical property refers to the extent of permanent or plastic deformation a material undergoes before fracture?
Which mechanical property refers to the extent of permanent or plastic deformation a material undergoes before fracture?
- Ductility (correct)
- Strength
- Elasticity
- Stiffness
What is the measure of a material's ability to restore to its original shape and size after the removal of external deforming loads?
What is the measure of a material's ability to restore to its original shape and size after the removal of external deforming loads?
- Hardness
- Toughness
- Elasticity (correct)
- Ductility
Which property denotes resistance to recoverable deformation?
Which property denotes resistance to recoverable deformation?
- Strength
- Toughness
- Elasticity (correct)
- Hardness
Which term describes the permanent deformation and/or failure of a component under fluctuating loads?
Which term describes the permanent deformation and/or failure of a component under fluctuating loads?
What does hardness measure in a material's mechanical properties?
What does hardness measure in a material's mechanical properties?
What is the splitting of a component into at least two halves called?
What is the splitting of a component into at least two halves called?
Study Notes
Mechanical Properties of Materials
- Strength is the ability of a material to bear a load before fracture.
Ductility
- Ductility is the extent of permanent or plastic deformation that a material undergoes before fracture.
- There are two measures of ductility: percentage elongation and percentage reduction in area.
Elasticity
- Elasticity is the ability of a material to restore its original shape and size after removal of external deforming loads.
- Young's modulus is the measure of elasticity.
Stiffness
- Stiffness is the resistance to elastic (or recoverable) deformation.
Hardness
- Hardness is the resistance to plastic (or permanent) deformation, which includes indentation, scratching, or marking.
Toughness
- Toughness is the resistance to both elastic and plastic deformation.
Fatigue
- Fatigue is the permanent deformation and/or failure of a component when subjected to fluctuating (both in magnitude and direction) loads.
- Examples of fatigue include gear teeth, aircraft wings, and crankshaft of an automobile.
Fracture
- Fracture is the splitting of a component into at least two halves.
Creep
- Creep is the permanent deformation and/or failure of a component when subjected to high stresses at high temperature.
- Example of creep includes turbine disk and blades.
Stress-Strain Relationships
- There are three types of static stresses to which materials can be subjected: tensile, compressive, and shear.
- Tensile stress tends to stretch the material, compressive stress tends to contract the material, and shear stress tends to cause adjacent portions of the material to slide against each other.
- A stress-strain curve is the basic relationship that describes mechanical properties for all three types of loading.
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Description
Test your knowledge on strength, ductility, elasticity, and stiffness properties of materials. Questions cover topics such as the ability to bear a load before fracture, extent of permanent deformation, ability to restore to original shape, and resistance to elastic deformation.
