Engineering Normal Strain
Measure a member’s extension relative to its original length.
Try this formula
Calculate engineering normal strain or choose another supported quantity.
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Try this formula
Calculate engineering normal strain or choose another supported quantity.
Use decimals or scientific notation, such as 1.2e3. Calculations update as you type.
Engineering normal strain
Enter the known values to see the result.
Use the original gauge length, not the final length. Extension is positive; shortening is negative. This is average engineering strain, not logarithmic true strain.
Difficulty
Beginner
Read time
4 min
Prerequisites
Basic algebra, mechanics, and consistent SI units
Source
Donney Fan — MECH 360 — Mechanics of MaterialsReference equation: Stress & Strain — Normal strain. FormuLab wrote new explanations, assumptions, applications, and numerical examples.
Definition
Engineering strain compares a length change with the length that was present before loading. It is dimensionless, so a small number can also be expressed as a percentage or in microstrain.
Variables & Units
| Symbol | Meaning | Units |
|---|---|---|
| Engineering normal strain | ||
| Signed change in length | ||
| Original gauge length |
Real-World Applications
Tensile tests
Convert measured elongation into engineering strain.
Displacement checks
Compare extension measurements on different gauge lengths.
Worked Example
Problem
A 2 m gauge length extends by 0.001 m. Find its engineering strain.
Given
Solution
Final Answer
Contents
Info
Tools
Source & review
Reference equation: Stress & Strain — Normal strain. FormuLab wrote new explanations, assumptions, applications, and numerical examples.
Assumptions
- • Use the original gauge length, not the final length.
- • Extension is positive; shortening is negative.
- • This is average engineering strain, not logarithmic true strain.
Languages
FormuLab is a study reference. Verify formulas, units, assumptions, and course-specific conventions before relying on them.