Principal axes — where it appears
Named by 2 essays across one field — each of them below, with the objects they name alongside it.
Loaded straight down, and it moves sideways
Every section this collection has drawn had an axis of symmetry, and that symmetry has been doing silent work. Take it away and a vertical load produces a neutral axis that is not horizontal, a deflection that is not vertical, and on one ordinary section a sideways movement larger than the downward one.
The worst stress is not where the worst bending is
Every stress this collection has quoted is a stress on a particular plane, and neither the bending stress nor the shear stress is a property of the point. Turn the plane and both change; one pair of numbers does not, and on a short beam it peaks where neither of them does.
Named alongside it
The objects these essays reach for when they reach for this one.
Bending stressNeutral axisBiaxial bendingFirst moment of areaFlangeI-sectionProduct of inertiaSecond momentShear centreShear flowShear stressStress concentration