×
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!
  • Students Click Here

*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.

Students Click Here

Vane shear test

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! Already a Member? Login


Resources

eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. Download Now

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