Elastic Perfectly Plastic Gap Material

BRYGN · Post by **BRYGN** » Fri Apr 08, 2005 10:40 am

I was wondering if there is an input parameter for the ElasticPPGap which will cause it to accumulate damage. In other words. currently as I load it up I get a plastic deformation which is not present during reloading. I know that the manual doesn't show another parameter but I thought I would ask. I was just thinking it would be nice if it could accumulate damage like most other materials do.

Thanks

mackie · Post by **mackie** » Mon May 02, 2005 10:55 am

yes, just add the word
damage
to the end of your uniaxialMaterial

it functions as you would expect

silvia · Post by **silvia** » Mon May 02, 2005 10:58 am

mackie,
please send me the command information, if there is more, and describe how it accumulates damage.
thank you

mackie · Post by **mackie** » Mon May 02, 2005 11:06 am

silvia,

this is the current syntax:

uniaxialMaterial Elastic ElasticPPGap $matTag $E $Fy $gap <damage>

but Frank is sitting on a new version that has kinematic hardening built in, so the syntax in a day or so will then become:

uniaxialMaterial Elastic ElasticPPGap $matTag $E $Fy $gap <damage> <eta?>

where eta is Eh/E (ratio of hardening to elastic stiffness)

Kevin

mackie · Post by **mackie** » Mon May 02, 2005 11:10 am

errr, sorry, the eta comes before the damage in the new version, but can be omitted so that the previous syntax is still valid.

ie, the old way works:
uniaxialMaterial Elastic ElasticPPGap $matTag $E $Fy $gap <damage>

and the new way is:
uniaxialMaterial Elastic ElasticPPGap $matTag $E $Fy $gap <eta?> <damage>

silvia · Post by **silvia** » Mon May 02, 2005 11:20 am

super, thank you.

mackie · Post by **mackie** » Mon May 02, 2005 11:22 am

ok, while I'm continually making some more errors, I just noticed it says Elastic ElasticPPGap, which is of course not true, it's just ElasticPPGap