Varying material properties with time step in Abaqus

[Partamuumi]

Hello! I've been browsing for help but I could not find anything to make my model work so I would really appreciate your help!
I have a composite plate made of several plies of different materials. What I need is to change these materials E and G with time (in each time step). I tried defining my materials like this:

** ----------------------------------------------------------
** TX_950_44_DEG 1013
** ----------------------------------------------------------
**
** E1, E2, nu12, G12, G13, G23
*Material, name=TX_950_44_DEG
*Elastic, type=LAMINA, dependencies=5
21300.,7000., 0.3,7500., 300.,4500.
15975.,5250., 0.3,5625., 225.,3375.
10650.,3500., 0.3,3750., 150.,2250.
5325.,1750., 0.3,1875., 75.,1125.
2130.,700., 0.3,750., 30.,450.

So as you can see, I defined 5 different properties for this material. Time steps that I am using are:

*Time Points, name=MEASUREMENT, GENERATE
0.0,0.5,0.5
0.5,0.7,0.1
0.7,1.05,0.01
1.05,1.20,0.05
1.20,1.60,0.01
1.60,2.0,0.1

So the idea is this:
- Between 0.0 and 0.5, use the first material prop
- Between 0.5 and 0.7, use the second material prop
- Between 0.7 and 1.05, use the third material prop
- Between 1.05 and 1.20, use the fourth material prop
- Between 1.20 to the end, use the last prop

I think it should be made using FIELD command but to be honest, I am pretty new to Abaqus and I have no clue. I would be very thankful if you could help me

 

[FEA way]

You should do it using field variables.

Here’s an example of how to do it:

https://www.eng-tips.com/viewthread.cfm?qid=321293

 

[Partamuumi]

Yes, I already saw that post but I do not know how can I adapt it to my case.. Is my material definition right? or should I erase the "dependencies" and add the FV1 to each row? and how does Abaqus know what I mean with that?

** E1, E2, nu12, G12, G13, G23, FV1
*Material, name=TX_950_44_DEG
*Elastic, type=LAMINA
21300.,7000., 0.3,7500., 300.,4500., 0.0
15975.,5250., 0.3,5625., 225.,3375.,1.0
10650.,3500., 0.3,3750., 150.,2250.,2.0
5325.,1750., 0.3,1875., 75.,1125.,3.0
2130.,700., 0.3,750., 30.,450.,4.0

Then, the way to define the time step is with AMPLITUDE? I do not understand that part... should it be something like this?


*AMPLITUDE, NAME=myAmp
** time, FV1
0.5, 0.0
0.7, 1.0
1.05, 2.0
1.20, 3.0
2.0, 4.0
** field variable definition
*FIELD, VARIABLE=1, AMPLITUDE=myAmp
myField-NSET, 1.0
**

But do I have to write this after my *Time Points definition?
Sorry for so many questions, as I said, I am new to Abaqus.. And thank you so much!

 

[Mustaine3]

Time Points are for output only. They have nothing to do how loads or material data change with time.