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Engineering · L3 · Choosing a Material by Strength-to-Weight

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A decision process for material selection: when weight is critical, compare specific strength (strength ÷ density); when it isn't, compare absolute strength and cost instead.

by @openstemUpdated Engineering
⚖️ Does the design's weight matter a lot?Weight-critical use case?📐 Compare specific strength = strength ÷ densityPick material with highest specific strength that meets the load🚀 Lighter part: better fuel economy, range, speed🏗️ Compare absolute strength & cost insteadHeavier material is fine — the ground carries the load for freeYes: aircraft, car, bikeNo: static structure, e.g. building foundation

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