load on a circle and Axialsym model
load on a circle and Axialsym model
(OP)
1) one question about how can apply the load: can we apply a pressure on a line with abaqus?how?I have tried but abaqus don't accept. Also if I want to applya line load on a circle how I can do?I have tried to do a partition with a circular line but when i apply the load abaqus doesn't accept the oad on the line!!
2) I have tried to modeled a circular plate subject to a circular load using the 2D axialsym shellsection deformable model.I used for preprocessing abaqus cae but the program didn't work. I had one error in the mesh and anoter in the input file but I didn't find the error. I report my steps:
a)I model the plate drawing the sketch of a rectangular section
b)I define the material isotropic elastic
c)define of section:shell homogeneous with thickness of the shell like the plate that I want to model
d)assignement of the section at all te plate
e)partition of the plate i order to apply a pressure like with a ring
f)mesh element type is a critical point and I'm not sure bout what element I have to choice (any ideas??)
g)apply boundary condition for axialsym and plate then load
H)create of job then submit
but the program said to me I have one error in the input (what??))
thanx nikko
2) I have tried to modeled a circular plate subject to a circular load using the 2D axialsym shellsection deformable model.I used for preprocessing abaqus cae but the program didn't work. I had one error in the mesh and anoter in the input file but I didn't find the error. I report my steps:
a)I model the plate drawing the sketch of a rectangular section
b)I define the material isotropic elastic
c)define of section:shell homogeneous with thickness of the shell like the plate that I want to model
d)assignement of the section at all te plate
e)partition of the plate i order to apply a pressure like with a ring
f)mesh element type is a critical point and I'm not sure bout what element I have to choice (any ideas??)
g)apply boundary condition for axialsym and plate then load
H)create of job then submit
but the program said to me I have one error in the input (what??))
thanx nikko





RE: load on a circle and Axialsym model
I am a bit confused about what you are trying to do.
If the real 3D part is characterized by axis symmetry, your 2D model should contain half of the axial section of the part. When you say "circular plate", do you mean that the axial section you modeled is a thin rectangle ? At least this is the way I would model a circular plate buy taking advantage of axis symmetry.
If you have an inner partition then you cannot create a 2D surface based on the partition edges and neither you can apply loads which require surfaces as support. You can apply boundary conditions on these inner partition edges though.
RE: load on a circle and Axialsym model
corus
RE: load on a circle and Axialsym model
I try to explain better:
real problem: a ring apply a normal force on a circular plate with thickness of 500 micronmeter at radius r
Model: 2D analsys of circular plate (thickness smaller then te other two dimension) with a circular load applied at radius r
My first question was about the load: I find out that I can apply a pressure if I use the partition on a ring surface, but I can't found how apply a load on a circle with abaqus cae. any ideas?!
second about the element type: what means consistent with the type of sections? I think in this case a plate can be modeled with shells , but when I have to choice the element type for the mesh I have not very clear what diference if a choice qudratic or linear and hybride etc..for my application that is static and with very small displacement probably linear element type is good?!
the thickness of the shell must be like the thickness of the plate?
About the axialsym sure the section I modeled is a thin rectangle.
How can I read the file .dat?
thanx
RE: load on a circle and Axialsym model
Other text files that may contain useful information are:
.sta
.msg
.log
RE: load on a circle and Axialsym model
RE: load on a circle and Axialsym model
ERROR: 41 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection.
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO INTERPRET SOME DATA. SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION
RE: load on a circle and Axialsym model
*Element, type=CAX8
P R O B L E M S I Z E
NUMBER OF ELEMENTS IS 41
NUMBER OF NODES IS 208
NUMBER OF NODES DEFINED BY THE USER 208
TOTAL NUMBER OF VARIABLES IN THE MODEL 416
(DEGREES OF FREEDOM PLUS ANY LAGRANGE MULTIPLIER VARIABLES)
THE PROGRAM HAS DISCOVERED 1 FATAL ERRORS
** EXECUTION IS TERMINATED **
It's not veruy clear about the inpu error, is it possible is the same error of the element type for the mesh???
How I can decide the right properties for thus elements??
RE: load on a circle and Axialsym model
corus
RE: load on a circle and Axialsym model
RE: load on a circle and Axialsym model
You did not assign a section the part.
In CAE->Property Module ->Menu -> Section ->Create
Category->Solid
Type->Homogeneous
Then use:
CAE->Property Module ->Menu -> Assign ->Section
Select part and assign the created section.
The element type you selected (CAX8) should be ok.
RE: load on a circle and Axialsym model
RE: load on a circle and Axialsym model
under section property after I have defined the type of section solid homogeneus it ask for the shell thickness, I'm not very sure about this value. Is it reasonable the same value of the thickness of the plate. or different?
RE: load on a circle and Axialsym model
resume of the problem:
circular plate (small thickness) with circular load on a cicle at r0: then axisymmetric problem.
I have modeled the plate in the modeling space axisymmetric with shell base feature. then why the section has to be solid??
Other question:
when you write an input file if you want to mesh like in this case the rofile of the plate then a rectangle:
(eg bias etc) have defined the node how you can fill. In particular. How you can choice choice the parameter of NFILL.
RE: load on a circle and Axialsym model
Because an axisymmetric element is a 2D abstraction of a 3D model - hence it requires 'solid' element properties.
Regards
Martin
RE: load on a circle and Axialsym model
from Martin"
This is a good point..I'm a bit confusing...
it' not clear if when you define the section then oyou have consequence on the kind of analysis
I mean the analisys with solid section is 2D or 3D?
Can you use shell 2D elements or continuum (solid) elements with solid section?
RE: load on a circle and Axialsym model
I admit that it may seem confusing - *SOLID SECTION is also used to assign properties to 3D hex and tet solid elements.
Axisymmetric shells (SAX1) are different, as they do have a thickness in the x-y plane - hence their properties are set with the *SHELL SECTION keyword, with a thickness given on the data line.
Regards
Martin