Stress Concentration Factor: Why a Small Hole Can Triple Local Stress
A crack in an aircraft window, a fracture starting at a bolt hole, a shaft that snaps at the shoulder where the diameter steps down. These failures sh…
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Bearing Life (L10): What the Catalog Number Really Tells You
Open any rolling-bearing catalog and you will find, next to each part, a number called the dynamic load rating, C. It is tempting to read it as "the l…
Hertz Contact Stress: How to Predict Pressure Where Two Surfaces Meet
When a hardened steel ball rests on a flat plate, the entire load passes through a contact patch smaller than a pinhead. Intuitively you might expect …