bleistift2 ( @bleistift2@feddit.de ) English52•2 months agoThat’s pressure.
TheOakTree ( @TheOakTree@beehaw.org ) English13•2 months agoAgreed. Perhaps it was based on tensile stress? Tensile stress = deforming force / cross-sectional area
nooneescapesthelaw ( @nooneescapesthelaw@mander.xyz ) English10•2 months agoWelcome to engineering, where we have MPa as a unit of stress and mm/mm as a unit of strain!
azi ( @azi@mander.xyz ) English3•2 months agomm/mm?? why not call it m/m?
Umbrias ( @Umbrias@beehaw.org ) English2•2 months agoBecause 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 ( @azi@mander.xyz ) English1•2 months agoHow is it more practical when 1 m/m = 1 mm/mm = 1 μm/μm?
nooneescapesthelaw ( @nooneescapesthelaw@mander.xyz ) English1•2 months agoThe original specimens and data are usually in mm, not meters so mm/mm makes more sense than m/m, although you do have a point
Umbrias ( @Umbrias@beehaw.org ) English1•2 months agoBecause excel doesn’t have built in unit handling so when you enter in readings from the strain gauge you’ll probably enter them in what’s being reported.
You can write the units of strain however you like, I often say ul for unitless.
bleistift2 ( @bleistift2@feddit.de ) English2•2 months agoWhy km/h (or mph) and not ft/year? Because the numbers have a nicer magnitude then.
nooneescapesthelaw ( @nooneescapesthelaw@mander.xyz ) English6•2 months agoDoesn’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
bleistift2 ( @bleistift2@feddit.de ) English2•2 months agoI feel like I should’ve spotted that… they’re the same units. 🤦
Umbrias ( @Umbrias@beehaw.org ) English6•2 months agoYes. Stress is a measure of an object’s internal pressure.
fossphi ( @fossphi@lemm.ee ) English11•2 months agoLatex math mode text without
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Pathetic