What is the relation between approximate thickness and mid-surface offset parameter of TPMS unit cell and its relative density ?

Dear colleagues,

I am working with Python scripting on Periodic Boundary Conditions (PBC) for a GYROID unit cell in Abaqus. I used SHELL elements in Abaqus.

However, I have difficulty applying PBC on the corners of Gyroid because Gyroid only has 6 corners (C1, C2, C3, C5, C7, C8) and it does not have nodes (materials) on nodes C4 and C6 as shown in the figure, thus I cannot apply linear constraint equations to the node pairs related to C1 and C7.

For your information, I follow this paper to apply PBC for Gyroid: Omairey, Sadik L., Peter D. Dunning, and Srinivas Sriramula. "Development of an ABAQUS plugin tool for periodic RVE homogenisation." Engineering with Computers 35 (2019): 567-577.

If anyone knows this issue, could you please help me? I really appreciate this.

Thank you so much,

Best regards,

Dear all

I want to specify random material to elements. for doing this first of all I want to create sets to elements then specify the materials tho them.

to create sets in script we should write the fallowing code I used For loop to identify all elements and define sets)

for i in range(1,(width*height)/(meshsize**2)):

mdb.models['Model-1'].parts['Part_1'].Set(elements=

mdb.models['Model-1'].parts['Biaxial'].elements..getSequenceFromMask(mask=(

'[#0 #10 ]', ), ), name='Set-'+str(i))

as you know we can not recognize masks so my question is that how can I identify Elements index(names or anything) to define sets?

special regards Sobhan

I have some highly porous materials and I have to determine the density of them.

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I am seeking the natural frequencies of a stationary disc (modeled in the r & theta plan) through a home-developed Matlab code, and then compare the results with Abaqus. The disc is fixed from the inner surface and is allowed to deform freely at its outer surface.

What I get is repeated values of certain frequencies that are unique in Abaqus. Most of the frequencies are not obtained. Any recommendations for such a problem?

In the attached two images, I am showing the repeated results of my FEM Matlab code and Abaqus output. As seen, the first natural frequency is repeated around 60 times. However, it's only appearing for one time in Abaqus results.

(I am using a Q8 element with two degrees of freedom at each node. Thickness is unity.)

Inner radius: 0.2m

Outer radius: 0.5m

Density: 2800 kg/m3

Elastic modulus: 200GPa

Poission's ratio: 0.3

This is the error I got over time: Rotating Machinery, Magnetic, Nonconducting Magnet 14: Defining only a fraction of north and south possible only if a pattern is specified and identifiable. Domains: 4, 5, 10, 14, 15, 17, 19, 21, 22, 24, 2.

However, I have done the following;

1. created a selection for north and south poles for individual magnets

2. created a physics under the domain for nonconducting magnets but only 1 out of 12 is active

It seems Abaqus can't save the excel files automatic. I want to export XY data using Excel Utilities tool, but it just open, can't save automatic. So I using win32com module, but it is wrong.

------------------

from win32com.client import GetActiveObject

def just_save():

try:

app = GetActiveObject('excel.Application')

print('Running Excel instance found.')

except:

print('No running Excel instance.')

xlBook = app.Workbooks(1)

xlBook.SaveAs(r'G:/FEA/xxx/xxx/xxx.xlsm')

xlBook.Close()

Hi, I'm trying to use the pandas module in an Abaqus script. I tried to copy the pandas package from Anaconda to the path "~SIMULIA\EstProducts\2020\SMApy\python2.7\Lib\site-packages". Although I can import pandas in Abaqus, I get an error "AttributeError: 'module' object has no attribute 'read_csv' "when running scripts.

Does anyone know why this is happening?

Am I adding pandas packages in the wrong way?

Hi all,

Hope everyone is doing great!

Just a quick question, when I have 2 parts modelled in SHELL element with shell offset in the section manager set to 'middle surface', at the location where they connect, for example, a beam is connecting into a column forming a T-joint, do you guys normally leave a small gap (i.e. half the wall thickness of the column) to account for the actual dimension of the column or leave no gap (i.e. connecting centre-to-centre)?

After all, does it even matter or make any difference in leaving a small gap to account for the fact that the shell model is defined at the middle surface instead of the external surface? I know there will be a small influence on the loading eccentricity but does it necessary? This probably depends on the scale of the model, doesn't it?

Many thanks,

Heng