"It has something better," Sarah said, blowing a layer of dust off the cover. "It has the philosophy."
Elias paused at a paragraph regarding factor of safety. "In design," Faires had written, "uncertainty is the only certainty. The factor of safety is not a margin for ignorance, but a humility before the variables of nature." design of machine elements faires pdf
"It’s the stress concentration," muttered his lab partner, Sarah, rubbing her temples. "The geometry at the shoulder fillet is too sharp. The moment it hits 4,000 RPM, the stress spikes, and snap. It’s game over." "It has something better," Sarah said, blowing a