Young's Modulus

What is Young's Modulus?

A measure of a material's stiffness — how much stress is required to produce a given elastic strain. It's an intrinsic material property independent of the part's geometry, which is why a steel rod and a steel I-beam share the same Young's modulus despite behaving very differently under load.

The five clues

Engineerdle #55 described Young's Modulus with five clues, revealed one at a time from hardest to most direct. Each clue points at a different property of the concept.

1. 01A material property, not a structural one — it doesn't depend on shape.
2. 02It's the slope of the straight part of a stress-strain curve.
3. 03Steel's value is roughly three times that of aluminium.
4. 04Rubber sits near the bottom of the scale; diamond near the top.
5. 05It's the constant of proportionality in Hooke's law: σ = Eε.

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