×
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

Effect of specimen geometry on impact strength

Effect of specimen geometry on impact strength

Effect of specimen geometry on impact strength

(OP)
What effect does length of an impact test bar have on the strength reported?

RE: Effect of specimen geometry on impact strength

There should not be much variance in the geometry of impact test bars, assuming you are testing to a known standard. Are you doing Izod or Gardner testing?

RE: Effect of specimen geometry on impact strength

(OP)
We are doing IZOD, some specimens are cut from flex bars so the thickness and width is the same but the length varies.

RE: Effect of specimen geometry on impact strength

Length shouldn't matter but thickness will. As the the specimen gets thicker, it will transition from plane stress to plain strain, which is to say from a bi-axial to tri-axial stress state. This will facilitate craze formation near the crack tip and there will be a significant drop in energy per unit thickness.

Rick Fischer
Principal Engineer
Argonne National Laboratory

RE: Effect of specimen geometry on impact strength

if you are using CVN test, the lenght also is important, since duration of test could be shorter if the test piece is shorter too, hence the energy could be lower than real. At the opposite side, if the test specimen is larger, more friction over the anvil, more energy to fracture

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

White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. 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