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stress level in rebars

 

Hi,

If a reinforced concrete shell element with rebar layers is defined,
how can we check the stress level of rebars?

Thanks in advance,
C.Nasirai
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How's Properties sheet in different directions in Abaqus

 

Hi
I'm going to get a piece of the earrings in the forging operation, do modeling.
Below is the press sheet in two directions parallel to the rolling
operations and within its various properties. How to understand the
properties of the program Abaqus.
Please advise me
Thank you infinitely.

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VUMAT Problem

 

Hello to all,

I am need to developed a VUMAT subroutine in order to model hysteresis material in abaqus explicit.

my worry that is, I have any information about VUMAT and Fortran.

Please any one can give me a good website or some information to start to write this subroutine VUMAT,,!!!!

Please help me ??

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Run Abaqus from a Java code

 

Dear all:
 
Is it possible to run Abaqus from a Java code? or is there any communication way between Abaqus and Java?
I want to simulate a simple problem and pass some info from Abaqus to Java code and vice versa.
 
Thanks, 
M. Malekan
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Helmholtz Equ.

 

Hi.
I want to get k^2(Wave Number) or Frequency of Helmholtz Equ.
model:rectangular=1*1,E=200E9 , Poisson=0.3,
Boundary Con.:Neumann
Helmholtz Equ: d^2/dx^2 p+d^2/dy^2 p +k^2 p=0
K^2=(2*3.14*f)^2/c^2

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friction stir welding

 

Dear all, 


I am attempting to measure thermal output and residual stresses of aluminuim alloy AA8053 during friction stir welding process, during submitting job and error occurs' element 1 instance plate AA5083-1 is missing a property definition: check set and element definitions' 


any ideas on how to solve this? 


cheers,

hemin

 

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Subroutine GAPCON Output of Distance Between Specific Nodes in a Contact Pair -- Help

 

I have a surface contact definition between two surfaces which are not in touch in a coupled-temperature-displacement analysis whereby I define the interaction property between them to be the GAPCON subroutine.

Is there a way to ask ABAQUS to write in the dat file the distance d(1) between two specific nodes of the contact pair?

Any help is deeply appreciated!

Thank you
A
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MPC user subroutine

 

I have written a MPC user subroutine for connecting elements of different sizes, which function like constraint'Tie' in Abaqus. The model is 2D, contains 2 instances. Instance 1 (named Part-1-1), is the large element, instance 2( named Part-2-1) is the 2 small elements, they are connected by the user defined MPC subroutine. The model is shown in the attached image, the color means the displacement component U1. Since the model is under simple tension, U1 should be a linear function of coordinate X. But the results showed unexpected U1 value 0 at node 3 of small elements, however at node 2 and 4 the displacement U1 is continuous with that of the large element. Could someone tell me why I obtained this?

I also want to check if my under standing on the data line after the keyword *MPC is correct. 

My understanding is as follows:
*MPC, user, mode=node
 1, dependent node lable, independent node lable ,independent node lable ,independent node lable , etc 
or the second way:
*MPC, user, mode=node
 1, dependent node set, independent node lable ,independent node lable ,independent node lable , etc 
 And in the second way, each node in the dependent node set will be constrained by the following indepent node in the way of contraint JTYPE 1.
 
In the input file, I defined the MPC constraint using the folling lines:
*MPC, user, mode=node
 1, Part-2-1.5, Part-1-1.2,Part-1-1.4
*MPC, user, mode=node
 1, Part-2-1.3, Part-1-1.2,Part-1-1.4

*MPC, user, mode=node
 1, Part-2-1.1, Part-1-1.2,Part-1-1.4 

My MPC user subroutine is of Node mode, as follows:
      SUBROUTINE MPC(UE,A,JDOF,MDOF,N,JTYPE,X,U,UINIT,MAXDOF,LMPC,
     * KSTEP,KINC,TIME,NT,NF,TEMP,FIELD,LTRAN,TRAN)
C
      INCLUDE 'ABA_PARAM.INC'
C
      DIMENSION UE(MDOF),A(MDOF,MDOF,N),JDOF(MDOF,N),X(6,N),
     * U(MAXDOF,N),UINIT(MAXDOF,N),TIME(2),TEMP(NT,N),
     * FIELD(NF,NT,N),LTRAN(N),TRAN(3,3,N)
C
      IF (JTYPE .EQ. 1) THEN
C   Define shape functions at the interface edge of the large element  
        N2 = (X(2,1)-X(2,3))/(X(2,2)-X(2,3))
        N3 = (X(2,1)-X(2,2))/(X(2,3)-X(2,2))
C
        A(1,1,1) =  1.
        A(2,2,1) =  1.     
        A(1,1,2) = -N2
        A(2,2,2) = -N2
        A(1,1,3) = -N3
        A(2,2,3) = -N3
C
        JDOF(1,1) = 1
        JDOF(2,1) = 2
        JDOF(1,2) = 1
        JDOF(2,2) = 2
        JDOF(1,3) = 1
        JDOF(2,3) = 2
      END IF
C
      RETURN
      END

[Non-text portions of this message have been removed]

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Concrete Damaged Plasticity approach for FRP-toConcrete Bond Behavior

 

I was wondering what is the benefits of defining concrete tensile softening part with stress-fracture energy approach? What is the differences between stress-strain approach and stress-fracture energy approach? 

My main study is related with the strengthening of RC structures with FRP materials and I have convergence problem for analyzing longer bond length of FRP and ultimate load capacity level. I think this problem is related with describing the concrete based on concrete dam age plasticity. I normally define the concrete based on stress-strain relation for concrete tension softening and compression hardening, but I encounter convergence problem. As far as I know when I define the concrete tension softening part with stress-fracture energy curve instead of stress-strain curve relation, I may solve the convergence problem. However, I couldn't find any numerical example to get input values and I need a numerical example. If you can provide it to me or explain me how can I calculate it, I will be really happy. 

I look forward to hearing back from you. 

Thanks 

Omer


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shell versus solid elements

 

Hello,

I wanted some further clarification on what might seem like a simple answer.

Why can't shell elements handle out of plane loads?  I understand that shell elements are based on shell theory (obviously), but what exactly is the driving mechanism that that prevents shells from modeling out-of-plane loads correctly?

If you can describe this answer in a form of an example to clarify, that would be great.

Thanks in advance!
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frz_ti@yahoo.com [Abaqus] | 11 Jul 16:21 2014
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Problem with finding points on edges and recreating

 

I have problem in selecting edges by using  the findAt command , I have some random points on some edges of my model that I want to create sets from , my model is shell


the thing is : despite this point is somewhere exactly on this edge , I see that for some edges Abaqus does not select that edge , despite there is another edge with exactly the same conditions , and abaqus could get that edge

but for one of them it doesn't , specially when I have to change the dimensions of my model , the situation gets even worse


isn't it possible to select an edge to make a set from it , not by using the coordinates of it's vertices ? cause from a vertice there come out more than one edge , so some edges are not selectable this way


I have tried many methods for this and none of them work when it comes to findAt

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Gmane