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 11 months ago
That’s pressure.
nooneescapesthelaw@mander.xyz 11 months ago
azi@mander.xyz 11 months ago
mm/mm?? why not call it m/m?
captainlezbian@lemmy.world 11 months ago
Because we’re precise!
Umbrias@beehaw.org 11 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.
azi@mander.xyz 11 months ago
How is it more practical when 1 m/m = 1 mm/mm = 1 μm/μm?
bleistift2@feddit.de 11 months ago
Why km/h (or mph) and not ft/year? Because the numbers have a nicer magnitude then.
nooneescapesthelaw@mander.xyz 11 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
iAvicenna@lemmy.world 11 months ago
I was told that you also sometimes have four basis vectors in 3D
TheOakTree@beehaw.org 11 months ago
Agreed. Perhaps it was based on tensile stress? Tensile stress = deforming force / cross-sectional area
Umbrias@beehaw.org 11 months ago
Yes. Stress is a measure of an object’s internal pressure.
einlander@lemmy.world 11 months ago
Pushing down on me.
fossilesque@mander.xyz 11 months ago
Pushing down on you.
bleistift2@feddit.de 11 months ago
no man ask for.
Viking_Hippie@lemmy.world 11 months ago
Under pressure that burns a building down