Damage Index in fatigueMaterial

[ankitprakashntpc]

Hi all,

I am working on SCBF with braces modeled with steel02 material wrapped with fatigueMaterial. I would like to know that is there any way to capture final damage indices (DI) of the brace elements during analysis run? This variable is used in the source code of fatigueMaterial.

Also is there any way to record command screen log history?

Always appreciate your informative replies.

Thanks and regards,
Ankit Prakash
ankitprakashntpcgmail.com

[fmk]

1. Fatigue material damage: yes .. ask for "damage" in the recorder instead of say stress.

2. logFIle command may work.
http://opensees.berkeley.edu/wiki/index ... le_Command

[kavir]

Hi
I model a chevron frame from nonlinear beam column elements and corotational geom system.its material is Steel02 with fatigue material.the frame is influence of cyclic load for plot hysteresis curve.but when fatigue failed occurs ,it not shown in hysteresis curve and immediately occurs Energy test converge error.
can you help me?

[ankitprakashntpc]

Thank you very much fmk for your help. Sorry for late acknowledgement.
I tried damage recorder with various combination to record DI for different fibers of many non-linear beam column element in my model. One thing I want to know is whether any code or command is available to record maximum damage (DI) in the fiber or where the fatigue failure is occurring? Monitoring 64 fibres x 3 sections x no. of elements is too cumbersome, given the fact that fiber location in a 2D element as shown with -xml command is not unique. I tried using EnvelopeElement recorder for recording DI in different fibres of same element at a section but the same is not working. Please help me if anybody can.
Appreciating your kind help as always,

Ankit Prakash
ankitprakashntpc@gmail.com

[kavir]

Hello dear fmk
Is it possible that damage index in damage recorder exceed from 1?
for example 1.12154

[fmk]

ankitprakashntpc

that is something that you would need to modify the source code to do. it is quite possible with use of static class variables.

Kavir,

here is the source code for you to look at.
http://opensees.berkeley.edu/WebSVN/fil ... terial.cpp

[kavir]

Hi dear fmk
which the following recorder should I use for record damage in elements?

recorder Element -file "$dataDIR/$subDIR2/element3005damage.txt" -time -ele 3005 section 3 material $matID_brace damage
or
recorder Element -file "$dataDIR/$subDIR2/element3005fiberdamage.txt" -time -ele 3005 section 3 fiber 0.0 -5.9 damage

[fmk]

the latter but as i don't know your model and where your fibers are what your materials are at the fibers i cannot tell you that is it.

[kavir]

thank you dear fmk for reply
my model is a 2-d chevron frame and its material is steel02. I use fiber section for brace (Box shape) and i use 10 nonlinear beam column element for brace. the height of brace section is 10 cm and ele 3005 is middle element in the brace. i want record damage in middle of brace? please help me.