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aluminum foam modeling

Submitted by raeisi.s on
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Hi Every Body 

I am trying to simulate compression test for an aluminum foam.

At first,I modeled a unit cell to create my final shape by repeating method(copy cell side to side).

Then I merged these cells to reach a unified shape.

As compression test is a quasi-static process,I try to run it by a dynamic explicit in Abaqus.

But it takes too much time so that each step time is less than 10^-5 for simple model and explicit analysis may take 4-5 days 



Time step increments in ABAQUS

Submitted by s_gupta on
software
Non-Linearity
increments

HI everyone,

I am actually pretty confused about how to determine the correct time step increment in ABAQUS in a non-linear analysis. I first faced this problem when I used Hashins damage to capture in-plane shear response of the composite . The response which is bilinear graph depends a lot on the initial time step I give for the analysis i.e., for some time steps there is no bilinearity , only a single straight line. This has led to great confusion in my mind whether my model has a problem or whether ABAQUS itself has this problem.

Joint definition

Submitted by wakeful on
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I modeled a 3D truss; About joint
defining: for joints that more than 2 beams element connect in them, is this
way correct to define pin connection between them?

If there are 3 beam element: 1, 2, 3

I defined first MPC constraint (pin)>
control point: from beam 1, and slave point: from beam 2

And for second constraint>
control point: from beam 2, and slave point: from beam 3

Is this definition result mean that
beam 1 and 3 are pin at that joint?

 

   

Normal
0

Ramping initial stress in Membrane elements

Submitted by ashwin_blj on
software
ABAQUS

Hi,

I am doing an explicit analysis, i am trying to model a woven fabric structure. I have to pre-stress the fabric so i have used this option. 



*AMPLITUDE, NAME=name

*SECTION CONTROLS, RAMP INITIAL STRESS=name



Details from INP file



*Membrane Section, controls = SC, elset=FABRIC, material=FABRIC

0.5,



*AMPLITUDE, NAME = RampStress, DEFINITION = Smooth Step,time=total time

0.0, 0.0, 0.0025, 1.0, 1.0, 1.0



*SECTION CONTROLS,NAME=SC, RAMP INITIAL STRESS=RampStress

gap of von mises stress between Ansys and Abqus

Submitted by TaoLI on
software
vibrations

Hello ,

 I am doing the correlation between Ansys and Abaqud for a shroud of cooling module (solid 92-C3D10) .I find the coorelation is perfect in frequency , but when i do the powerspectral density analysis, i noticed a gap of 10-20% on the peak value of nodal von mises stress ,  i'd like to know the reason of the diffrence .

 

 

Thank You .



 

*MATRIX GENERATE - Global Stiffness matrix

Submitted by salingerv on
software
ABAQUS
Stiffness Matrix
Abaqus output

Thank you  for your reply. I know but I was wondering if it is possible to omit them manually.

 One more question, I figured that using *MATRIX GENERATE, one could get the global stiffness, mass or load matrix in a ".mtx" file. But I am wondering why I can't get the file after the run.

https://www.sharcnet.ca/Software/Abaqus610/Documentation/docs/v6.10/boo…;

Progressive collapse analysis

Submitted by wakeful on
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Hello friends

I have a question about analysis method in Abaqus.

I want study the progressive of elements failure in a truss structure to find which element fail at first and which one fail after that while whole of the structure collapses.

Which kind of analysis method I could use?

Thanks a lot

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