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Correction for rubber membrane in CU triaxial test

Correction for rubber membrane in CU triaxial test

Correction for rubber membrane in CU triaxial test

(OP)
Hi,

Everyone can guide to correct for rubber membrane in CU triaxial test. The diameter specimen is 38mm, height to diameter ratio is 2. The thickness rubber membranes is 0.012''. I don't know to choose Young's modulus suitable value.

Thanks,
YP
  

RE: Correction for rubber membrane in CU triaxial test

Use a condom and neglect it.

RE: Correction for rubber membrane in CU triaxial test

Ron - remember that MIT or Harvard (can't remember which) actually carried out tests on the "best" rubber membranes - back in the early 1970s?  Trojans came in first!

RE: Correction for rubber membrane in CU triaxial test

BigH...I remember it as well.  We used them for years. Higher quality and thinner than the "scientific" membranes.

RE: Correction for rubber membrane in CU triaxial test

And more versatile!

RE: Correction for rubber membrane in CU triaxial test

Dave - don't tell me you reuse 'em!!  Won't work so well with the end cut off!

RE: Correction for rubber membrane in CU triaxial test

Is that why I have 14 kids?





(Really only two.)

RE: Correction for rubber membrane in CU triaxial test

The lab techs always complain when they have to use the used ones!!lol

Dave...I thought you would have figured it out after about #10.

RE: Correction for rubber membrane in CU triaxial test

If you're testing very soft or sensitive clays, it can be important.

From my graduate lab class:

Membrane resistance (N) = -pi*initial membrane diameter* thickness * 140 N/cm^2 * (axial strain +0.66*volumetric strain)

Volumetric strain is 0 for undrained shear

RE: Correction for rubber membrane in CU triaxial test

(OP)
Hi, GeotechinTraining

Your formula is very good. But this is your experiential lab. Where is the formula refer? Book or paper names?

TY

RE: Correction for rubber membrane in CU triaxial test

You could check BS1377:Part 8, there is a short paragraphy about membrane correction.

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