Beam & Stress

Sections, shear, torsion, Mohr — mechanics of materials, worked interactively. For macOS and iPadOS.

Eighteen screens. Every one is a live figure.

Drag a load along a span and the moment diagram redraws in the same frame. Rotate a stress element and the circle point travels twice as far, beside it, while you watch. Raise the shear on a section and the governing point jumps from the extreme fibre to the neutral axis — and the app tells you it did.

What it covers

Stress and strain at a point — circle, element, absolute maximum shear, generalised elastic relations
Beam diagrams and deflection — simple, cantilever, propped, fixed; by integration, by standard case, by superposition
Section properties — nine primitives, added or cut away
Bending, shear, torsion, columns, failure criteria, strain rosettes, axial and thermal, thin-walled vessels
Combined loading — five actions at once, with a scan for the point that actually governs

Why the answers can be checked

Results are verified against public-domain reference solutions — the NASA Astronautic Structures Manual, the Air Force Stress Analysis Manual, and MIL-HDBK-5J — and against an independent sixty-digit recomputation. The identities that must always hold are swept over thousands of parameter combinations, not checked at a handful of points.

The theory manual states every assumption and every limit of applicability, module by module. It is generated from the same specification file the application carries, so it cannot drift away from what the software does.

Three screens check themselves in front of you

Section Builder adds up tabulated properties and also walks the outline it is drawing, and prints how far apart the two came out.
Shear Stress integrates its own distribution back to the shear force that produced it.
Beam Deflection puts a standard case's closed form beside the same beam solved by integration.

None of the three pairs shares any algebra with the other half of its pair. That is why their agreeing means something.

Offline, and private

No account, no network, no data collected. There is no networking code in the binary. See privacy.