Welcome to engineering, where we have MPa as a unit of stress and mm/mm as a unit of strain!
Comment on Stress
bleistift2@feddit.de 1 month ago
That’s pressure.
nooneescapesthelaw@mander.xyz 1 month ago
azi@mander.xyz 1 month ago
mm/mm?? why not call it m/m?
captainlezbian@lemmy.world 1 month ago
Because we’re precise!
Umbrias@beehaw.org 1 month 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.
azi@mander.xyz 1 month ago
How is it more practical when 1 m/m = 1 mm/mm = 1 μm/μm?
bleistift2@feddit.de 1 month ago
Why km/h (or mph) and not ft/year? Because the numbers have a nicer magnitude then.
nooneescapesthelaw@mander.xyz 1 month 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
iAvicenna@lemmy.world 1 month ago
I was told that you also sometimes have four basis vectors in 3D
TheOakTree@beehaw.org 1 month ago
Agreed. Perhaps it was based on tensile stress? Tensile stress = deforming force / cross-sectional area
Umbrias@beehaw.org 1 month ago
Yes. Stress is a measure of an object’s internal pressure.
einlander@lemmy.world 1 month ago
Pushing down on me.
fossilesque@mander.xyz 1 month ago
Pushing down on you.
bleistift2@feddit.de 1 month ago
no man ask for.
Viking_Hippie@lemmy.world 1 month ago
Under pressure that burns a building down