Concepts & theory

Learn

From zero to laminate analysis. Start anywhere — every article says what it builds on and which tool it explains.

The lattice

Mechanical engineering as a crystal lattice — every cell is a live branch. Tap one to zoom in. This site lives in the two highlighted cells, but every branch connects.

MechanicalEngineeringstart hereMechanics ofMaterialsstress & strainMaterialsSciencepolymers · compositesStatics &Dynamicsforces & motionThermo-dynamicsheat & energyDesign &CADidea → partMecha-tronicsmachines + codeFluidMechanicsliquids & gasesManufac-turingmaking things● this site lives here
Interactive journey
From electrons to airframes — nine orders of magnitude in eight steps →

Electron shells → monomers → chains → fiber + matrix → ply → laminate → structure → product. Each level links to the tool that works there.

Start here — no background needed

Plain-language introductions for anyone from about 13 up. Read them in order and you will understand every tool on this site.

What is mechanical engineering?

The engineering of forces, materials, and machines — and a map of its branches, from statics to mechatronics.

Forces and motion: Newton's three laws

The three sentences from 1687 that still run every mechanical calculation, explained with everyday examples.

Stress, strain, and why things break

Stiffness is not strength, strength is not toughness — the three ideas behind every material choice ever made.

What is a polymer?

Plastics are tangled spaghetti made of molecules — that one picture explains melting, softening, stretching, and creep.

What is a composite?

Why gluing stiff fibers into soft plastic makes bike frames, aircraft wings, and wind turbine blades possible.

Heat, energy, and engines

Thermodynamics and fluids in plain language — and why curing an epoxy part is secretly a chemistry-of-heat problem.

Going deeper

Builds on the foundations: how parts get made, how they fail, and where materials science touches every other field.

How plastics and composites are made

Injection molding, extrusion, layup, autoclaves, filament winding, 3D printing — the ways raw polymer becomes a part.

Why things fail: fatigue, creep, and stress concentration

Most parts do not break from one big load — they break from small loads repeated, sustained, or concentrated.

Where materials meet chemistry, biology, and data

Polymer science is a crossroads: chemistry builds the chains, biology inspires the structures, data science finds the patterns.

Tool guides

The full theory behind each calculator and simulation.

Micromechanics: from constituents to lamina

Why the rule of mixtures nails E₁ but bounds E₂, and where Halpin–Tsai fits in.

Classical laminate theory and first-ply failure

The ABD matrix, why symmetric layups matter, and how Tsai–Wu differs from max stress.

Viscoelasticity: why polymers creep

Spring–dashpot intuition for creep and relaxation, and what the SLS model captures.