INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Vane shear test

Vane shear test

(OP)
Hello

I am currently doing a vane test on Kaolin clay at different moisture content. I have a spring calibration sheet from where I obtain the spring constant. However, from the data, the torque was found to increase with increase in moisture and the undrained shear strength also increases. which does not make sense, as I was expecting the stiffer the sample the greater the torque and shear strength. I am not sure where I am going wrong. I have repeated the test 4 times all shows the same pattern.
the formula I used are:

Cu = T/K T= torque and K is constant depending on vane dimensions (K= pi(D^2H/2 + D^3)
T = Spring constant/180*difference (I believe the difference is the difference between the initial and final reading in degrees)
This is what I obtained.

W% initial reading final reading difference Torque (kgcm) K Cu = T/K (kg/cm2)
35 5 310 305 5.05009E-05 78123.14831 6.46427E-10
61 5 97 92 5.73671E-05 78123.14831 7.34317E-10


Vane dimension

Diameter 25.5mm
Height 25.5mm

Can someone please assist me? I have attached the spring calibration. I am using Spring No1.

Many thanks

RE: Vane shear test

In my opinion the calibration reading and the torque formula is not related.
I think the procedure are the degree gives the load. The load multiplied by 50mm and divided by K, you will get the Cu

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close