Comment on Stress

bleistift2@feddit.de ⁨9⁩ ⁨months⁩ ago

• einlander@lemmy.world ⁨9⁩ ⁨months⁩ ago

  Pushing down on me.

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  • fossilesque@mander.xyz ⁨9⁩ ⁨months⁩ ago

    Pushing down on you.

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    • bleistift2@feddit.de ⁨9⁩ ⁨months⁩ ago

      no man ask for.

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      • Viking_Hippie@lemmy.world ⁨9⁩ ⁨months⁩ ago

        Under pressure that burns a building down

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• nooneescapesthelaw@mander.xyz ⁨9⁩ ⁨months⁩ ago

  Welcome to engineering, where we have MPa as a unit of stress and mm/mm as a unit of strain!

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  • azi@mander.xyz ⁨9⁩ ⁨months⁩ ago

    mm/mm?? why not call it m/m?

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    • captainlezbian@lemmy.world ⁨9⁩ ⁨months⁩ ago

      Because we’re precise!

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    • Umbrias@beehaw.org ⁨9⁩ ⁨months⁩ ago

      Because practicality. Strain generally occurs across mm scales at most for most traditional tensile tests and relevant materials. Normally it’s actually much less than mm. Occasionally you see micrometers/micrometers.

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      • azi@mander.xyz ⁨9⁩ ⁨months⁩ ago

        How is it more practical when 1 m/m = 1 mm/mm = 1 μm/μm?

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    • bleistift2@feddit.de ⁨9⁩ ⁨months⁩ ago

      Why km/h (or mph) and not ft/year? Because the numbers have a nicer magnitude then.

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      • nooneescapesthelaw@mander.xyz ⁨9⁩ ⁨months⁩ ago

        Doesn’t apply here, say for example i have a piece of steel with length 100mm and it stretches 10mm, is mm/mm the strain would be 0.1 mm/mm, in meters it would be 0.1m/m

        Really strain is dimensionless but occasionally people add units

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  • iAvicenna@lemmy.world ⁨9⁩ ⁨months⁩ ago

    I was told that you also sometimes have four basis vectors in 3D

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• TheOakTree@beehaw.org ⁨9⁩ ⁨months⁩ ago

  Agreed. Perhaps it was based on tensile stress? Tensile stress = deforming force / cross-sectional area

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• Umbrias@beehaw.org ⁨9⁩ ⁨months⁩ ago

  Yes. Stress is a measure of an object’s internal pressure.

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