NASGRO: Tension/compression option

[scartail]

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/Release6-1.pdf

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.

s0
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.
S.

 

[LiftDivergence]

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!

 

[scartail]

@LiftDivergence,

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.

 

[rb1957]

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.