Strain
By DarthVader
Date: 2021-10-16
Topic: 66 see comments
Post views: 1263
- The engineering definition of strain is the deformation of an object when a force is applied.
- Engineering strain is equal to the change in a dimension divided by the original dimension. It is often expressed as a percentage.
- Strain does not depend on the length of the material, but does depend on the force applied to it, and is roughly proportional to the force applied.
For any fibre, engineering strain is defined as the ratio of the change in length (the extension) to the original length and is usually represented by the greek letter epsilon, ε
Δl = l2 - l1
Original length = l1
Stretched length = l2
Extension (stretch) = Δl
The equation:
Strain = extension ÷ original length = ε = Δl ÷ l1
You will also see the strain quoted as a percentage:
ε% = Δl ÷ l1 × 100%
Example:
Metal rod
l1 = 1m (original length)
Δl = 0.001m (extension(stretch))
ε% = Δl ÷ l1 × 100% = 0.1%
Strain = 0.1%
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