Structural Engineering & Statics
where the load goes
Concept

Shear modulus — where it appears

The ratio of shear stress to shear strain, which for an isotropic material follows from the Young's modulus and Poisson's ratio at about two fifths of E. It sets a member's shear deflection and appears wherever a section twists, and for timber it is a sixteenth of E rather than a fortieth.

Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.

facescore — 25 N/mm² in sheard = 61 mm between the face centroids41 N/mm²41 N/mm²the core carries none of itbending stressD = 91.35 × 10⁹ N·mm² · 98.8% of it is the separation termwrinkling at 236 N/mm², which contains no length at all

Two skins and the space between them

A sandwich panel is a section made of a material that carries the bending and a material that carries none of it. The parallel-axis term is not a correction here — it is 98.8 per cent of the second moment — and the shear deflection is not a correction either.

sections · sandwich section 02040608005101520angle to the grain (degrees)strength (N/mm²)Hankinsona straight linetension4.47 at 45°, not 11.821 per cent of the strength along the grain, at half a right angle

The material that has a direction

Every material in this collection so far has had one modulus and one strength. Timber has three of each, differing by more than an order of magnitude, and the consequence is not a correction to steel design — it is a different set of checks with a different one governing.

materials · anisotropy

Named alongside it

The objects these essays reach for when they reach for this one.

Shear deflectionAnisotropyBearingComposite actionCoreElastic modulusFaceFractureGrainHankinson formulaInterfaceLimit state

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