Contact US

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.

Students Click Here

NASGRO: Tension/compression option

NASGRO: Tension/compression option

NASGRO: Tension/compression option

Hi all,

Would someone explain the tension/compression option for me? From what I can find online, it was introduced in vers.6.1. https://www.swri.org/sites/default/files/Release6-... In the appendix, it says something to effect of the complex structures of aircraft, where there are remote loads. It allows stress gradients for tension and compression.

But how does it modify the input stresses? And why?

I tried a simple case of loading. don't have the files, as it on my work computer.

tens: 0,1; 100,100
comp: 0,1; -100,-100

material. inco 718

load block: 10000 cycles, s0-t1 = 1, s0-t2 = 1, scale = 1.0
repeat schedule: 999,999

if I leave all options unchecked, I get ~2400 cycles before fracture toughness failure.
if I toggle 'tens/comp'... I get no growth predicted.
if I toggle 't1/t2'... I get ~2400 cycles before fracture toughness failure. Same as having options unchecked.

What am I missing?

Thanks in advance.

RE: NASGRO: Tension/compression option

Which module specifically are you using?

Definition of the stress gradient may be non-intuitive at first because it uses a normalized X (or x,y for bivariant stress) coordinate system. Post screen captures of your inputs if you can.

Keep em' Flying
//Fight Corrosion!

RE: NASGRO: Tension/compression option


Thanks for replying. For this example, I'm using CC11. I don't have nasgro on my persona pc, so I can't share anything.

RE: NASGRO: Tension/compression option

you can take a screen shot with your phone ...

it'd be nice to see the input deck.

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

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


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