Load Groups

[Schandra]

Dear all,

Suppose I want to perform crimping and then bending of a tube structure.

Can i use load groups as following:

LOAD
displacement conditions for crimping

LOAD
displacement conditions for bending

LOAD END


Warm Regards,
Chandra

[Prof. R.L. Taylor]

Yes,

You need to use the PROP option too and then set the proportional loads for each such that during crimping there are no bending values and during bending the crimping stays constant.  Type 2 proportional loads are the easiest way to input a load table for each.

[Schandra]

Thank you Prof. Taylor.

[Schandra]

Dear Prof. Taylor,

I have still some issues with the implementation of load groups. I am posting an example of my case here:

Code: [Select]

boun
1 0 1 1 0
2 0 1 1 0

LOAD PROP 1
disp ! applying displacement of nodes for crimping
1 0 -0.1 -0.1 0
2 0 -0.1 -0.1 0

LOAD PROP 2
disp !applying displacement of nodes for bending
1 0 -1 0 0
2 0 -1 0 0

LOAD END

end

batch
prop,,1
end
2 3
0,0 1,1 2,1

batch
prop,,2
end
2 3
0,0 1,0 2,1

--Solution  step follows--



Issues:
1. I also made another version where I specify displacement of end nodes for bending after I perform crimping

Code: [Select]

boun
1 0 1 1 0
2 0 1 1 0

LOAD PROP 1
disp ! applying displacement of nodes for crimping
1 0 -0.1 -0.1 0
2 0 -0.1 -0.1 0

LOAD PROP 2
edisp
3,24.85025,2,0,0


LOAD END
end

--Solution  step follows--

Unfortunately either of the cases is not performing as intended. Can you please let me know if what I am doing is correct.

Warm Regards,
Chandra

[Prof. R.L. Taylor]

What version of code are you using?

Can you post an input file that does not use any added modules by you?

[FEAP_Admin]

Works fine with my version of the code (8.4 and 8.5).  You may want to install a clean version of the code.  Attached is a test input file with output.

[Schandra]

Hello Prof. Taylor,

I am using ver84.
I split the input file into I1, I2, I3 & I4 to confirm with maximum individual file requirements.

Thanks,
Chandra

Dear Feap Admin,

Thanks for the files, I shall use them and solve the issue.

Thanks,
Chandra