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Questions and Answers
If a beam is supported at two points and the load is applied at a single point between the supports, the resulting stress is classified as complex stress.
If a beam is supported at two points and the load is applied at a single point between the supports, the resulting stress is classified as complex stress.
True (A)
A metal wire stretches when a load is applied, and returns to its original length when the load is removed. This behavior demonstrates plastic strain.
A metal wire stretches when a load is applied, and returns to its original length when the load is removed. This behavior demonstrates plastic strain.
False (B)
For a given material, strain is calculated by multiplying the change in length by the original length.
For a given material, strain is calculated by multiplying the change in length by the original length.
False (B)
Flashcards
What is Strain?
What is Strain?
Strain is the change in length or deformation per unit length, when a material is subjected to a force.
What is Elastic Strain?
What is Elastic Strain?
A type of strain where material returns to its original shape after the removal of external forces.
What is Complex Stress?
What is Complex Stress?
A condition where more than one type of stress develops in a structure due to applied load. Often seen in bridges and 3-point loading scenarios.
Study Notes
Complex Stress
- Occurs when a structure experiences more than one type of stress due to the application of load
- Bridges are an example where complex stresses are produced by 3 point loading
- Examples of complex stresses include: tensional, compressional, and shear stress
Strain
- Represents the change in length or deformation per unit length of a material when subjected to a force
- Strain = deformation or change in length / original length = (L - L*) / L*
- Strain is unitless and measured in percentage (%)
Types of Strain
- Elastic strain (reversible or temporary): the material returns to its original shape upon removal of the external force
- Plastic strain (irreversible or permanent): the material does not return to its original shape upon removal of the external force
Stress Strain Curve
- The shape and magnitude of the stress-strain curve are important in selecting dental materials
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