Elastic strength isn't a standard term in physics. It's often used in material science and engineering to describe the yield strength of a material.
Yield Strength is the point at which a material transitions from behaving elastically (recovering its original shape after stress removal) to behaving plastically (permanently deformed).
Here's a breakdown of the concept:
* Elastic behavior: When a material is subjected to stress (force per unit area), it deforms. If the stress is below the yield strength, the material will return to its original shape when the stress is removed. This is elastic deformation.
* Plastic behavior: Once the stress exceeds the yield strength, the material undergoes permanent deformation. This means it won't fully return to its original shape after the stress is removed.
* Elastic strength (yield strength): This is the amount of stress a material can withstand before it starts to permanently deform. It's a crucial parameter in material selection for applications where permanent deformation is undesirable.
Factors affecting yield strength:
* Material properties: Different materials have different yield strengths. For example, steel has a higher yield strength than aluminum.
* Temperature: Generally, yield strength decreases with increasing temperature.
* Strain rate: Applying stress quickly (high strain rate) can increase the yield strength.
* Microstructure: The internal structure of the material can affect its yield strength. For instance, heat treatment can alter the microstructure and improve yield strength.
Units:
Yield strength is typically measured in units of Pascals (Pa) or Megapascals (MPa).
Example:
Imagine a steel rod being stretched. If the stress applied is below the yield strength, the rod will return to its original length when the stretching force is removed. However, if the stress exceeds the yield strength, the rod will be permanently elongated even after the force is removed.
Therefore, understanding the concept of yield strength (or "elastic strength") is critical for selecting appropriate materials for various engineering applications.
