E Young's Modulus of Intact Rock and its unit.

[Usmi09]

I calculated the young's Modulus of an intact Rock by UCS. Stress/Strain at max.
so what is it's proper unit when stress is kg/cm2 and strain in mm
and is it right if I put L length is cm and deflection in mm ( Delta L mm / Li cm) or its unit must be the same? ( both are mm) ?

 

[killswitchengage]

I have not yet worked with rocks but i think you should convert kg/cm² to kpa or Mpa and let mm as it is .

 

[IRstuff]

It's whatever you need to make your presentation readable and understandable.

TTFN
faq731-376

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[fattdad]

modulus has units of F/L^2

f-d

ípapß gordo ainÆt no madre flaca!

 

[BigH]

Strain is not in units of length, mm, as it is the change in length (mm) divided by the original length (mm), hence mm/mm. That is why Young's Modulus is in the same units as the stress. (rather than length, you might think thickness).

 

[Mccoy]

Units must Always be coherent, cm with cm and mm with mm.

Anyway, you can check your value with tables, if it is a hard intact rock, young's modulus value should likely be in the order of a few GigaPascals up 20 GPa depending on rock type.

1 GPa = 10000 kg/cm² = about 10000 tsf

http://www.mccoy.it

 

[mudman54]

be sure to use kgf (kilograms force)to avoid conversion errors in Mathcad.