MATERIAL LAB / 02

Same sheet. Different strength.

Fold the edges of an aluminium strip. How much stiffness can geometry buy without adding material?

120 MM DEVELOPED WIDTH / ALUMINIUM / E = 70 GPA
TIP DEFLECTION
STIFFNESS / FLAT
STRIP MASS

Model & assumptions

A fixed cantilever under an end load: δ = PL³ / 3EI. Section inertia uses the parallel-axis theorem. Folding redistributes a strip of constant developed width; it does not add mass. Ideal elastic aluminium, E = 70 GPa, density 2,700 kg/m³; sharp bends, no local buckling, yielding or connection flexibility. Large deflections are flagged because the linear model then stops being appropriate.

MIT / End-loaded cantilever ↗

A product design is rarely a single ideal surface. It is a set of relationships between function, structure, material, tolerances, assembly and a way of making. When those relationships become parameters and rules, a team can explore a design space instead of redrawing the same part whenever a constraint changes.

SketchFold shows this thinking at a tangible scale. A colour-coded pen sketch becomes a crease network, then a geometry that can be simulated and fabricated in folded metal. The path from gesture to engineering data matters because it keeps the designer’s intent connected to manufacturing decisions.

The same principle applies to a component family, a facade panel system or a layout generator: define meaningful variation, expose what is fixed, and retain the rationale for why one option is preferred. A design space becomes useful when designers can navigate it and fabricators can trust it.

REFERENCES & FURTHER READING

Short paper excerpts above are attributed to their authors. Commentary is Kane Borg’s interpretation.