The finite-element-method tag has no usage guidance.
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9 views
Modeling Rotation and Translation of surface B.C. in Abaqus
I am trying to model a test which has grips that can translate in X and Y directions, as well as rotate. I have been trying to model this using constraints and a reference point but have not been able ...
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7 views
How to create tapered beam in Patran
A hollow cylindrical beam with inner radius is constant and have a varying outer diameter. How can i create this structure using 1-D or 2-D in Patran
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1answer
20 views
Strain gauge placement to measure a twisting beam
Where is it best to place a strain gauge to measure the twist of a beam? And what type of gauge is best?
In my application, I have a small metal part which experiences a twisting and bending force. ...
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13 views
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1answer
25 views
How to calculate residual strength of a corroded structure from their stress values?
Currently, I have an actual entire corroded bridge model in the FEM analysis in Abaqus
I want to estimate the residual strength of this bridge due to corrosion
from the output results in the Abaqus, I ...
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1answer
29 views
FEA; overstressing over crushing for glass container
How do I prove that during a loading session of a glass container, between two failure modes, overstressing or buckling (crushing), which will happen first via FEA? Is there any scientific way of ...
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1answer
39 views
Debugging Ansys ACT C# Extensions
I'm using the Ansys ACT Api with C# to create an extension for Ansys (Mechanical).
When developing the extension I need to build a dll file from C# code (using Visual Studio). My problem is that ...
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0answers
28 views
Polyurethane tube simulation in Solidworks [closed]
I am doing polyurethane tube simulation in Solidworks Simulation. I am using material PUR for polyurethane already defined in Solidworks. I have a question about the model type to be selected for ...
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1answer
40 views
Should I apply Force or Pressure, Ansys Static Structural
I am working on a project where I must find the maximum principal stresses on an object subjected to impact loading condition. I know the velocity of the object (the one which will hit the test object)...
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19 views
Bad triangular-shell elements in Abaqus?
Abaqus 6.14
I have a 2D shell mesh reconstructed from a *.ply file. When I verify the mesh I get 55% bad elements (CPS3).
So I get a list of all the bad elements & reconstruct the mesh again ...
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0answers
22 views
Abaqus implicit dynamic vs custom script
I'm trying to validate results from a custom code written with Matlab by comparing the results with Abaqus. I'm doing an implicit dynamic analysis using direct integration and, as done in Abaqus, I'm ...
1
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1answer
27 views
Predicting frequencies, decays, levels, and phases of modes of a circular membrane (drum head)?
I have been working on some acoustic synthesis software for modelling several acoustic instruments. I am using the principle of modal synthesis, where every mode of vibration is individually ...
1
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1answer
38 views
Spatially dependent material property in Abaqus/CAE
I am modelling a plate as 3D deformable solid. My plate has a spatially dependent isotropic thermal expansion coefficient.
I have defined this spatial distribution as a Discrete Field in a tabular ...
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0answers
19 views
Where to fix part in moment setup for FEA
I'm working on a project that involves supporting a distributed load on a bar that is held up by a moment at one end of a lever arm. My goal is to assess how much the bar bends under the distributed ...
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1answer
20 views
FEM: What's D in the equation for half band width
In the equation for half band width given below,
B = (D + 1)f
my textbook states D to be the maximum difference between node numbers in an element and all the elements are considered for its ...
1
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1answer
25 views
Do finite elements have to be planar?
Is it possible to define a finite element that isn't planar? For example the shell element shown in the picture below...
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0answers
16 views
Reasons for different analytical and simulated Young's modulus calculations
What can be some reasons for getting big differences in the analytical and simulated calculations of Young's modulus? Except just doing it wrong that is. Think around 30% difference for example.
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20 views
APDL hardpoints nodes keypoints etc
I'm conducting analysis of a beam structure using beam188s in apdl, Need to find the deflection of a point some distance along one of these beams. I created a hardpoint at this place, but how am i to ...
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1answer
40 views
Cantilever beam with disc at end (structural mechanics)
I am trying to figure out how I can assemble multiple finite elements to obtain the system mass matrix $\boldsymbol{M}$ and the stiffness matrix $\boldsymbol{K}$.
The situation is depicted in a ...
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20 views
How can I define temporary contacts in Ansys?
For a special simulation I need to define a temporary contact between three objects that two of them are perpendicular to one of them and the two push the one step by step. When they are at rest, ...
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0answers
115 views
How does Abaqus calculate reaction force?
I wrote a UEL for one element and compared to a reference UEL (FEM), where the results agreed satisfactorily, except the reaction force. The stress, strain, strain energy all were pretty accurate.
I ...
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1answer
17 views
How to create a non uniform pressure load in MSC Patran
I need to simulate an external pressure load that varies sinusoidally along a circular arc. The sinusoidal variation is with arc length.
I know how to create a uniform pressure load in Patran but do ...
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0answers
29 views
Searching for Anterior Cruciate Ligament MRI Images for Finite Element Model.
I'm searching for 3D MRI images for generating an mesh to be used in a Finite Element Modeling project. My group has access to a low-resolution CT scan and cadaver knees, but we don't have any good ...
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0answers
29 views
Is it possible to design solid slabs on ETABS 2016? [closed]
My graduation project involves designing several buildings with flat and solid slabs. I already know that ETABS can design flat slabs but is it possible to design solid slabs?
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1answer
46 views
Why doesnt steel melt when pouring titanium through it
How come you can pour molten titanium with a melting point of 3291 degrees into a steel funnel with a melting point of 1300 degrees and it doesn't melt the funnel?
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1answer
43 views
in keyword *SURFACE, file “FSECase1cor.inp”, line 79025: Unknown assembly element set_M_SURF-1016_E3 (What does this error mean?)
I submitted the edited inp. file in abaqus. I edited the thickness of shell elements
then after I run the edited inp. file, I am suffering from this error.
Actually, there is another error:
"There ...
3
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1answer
26 views
How to properly validate transverse isotropic elasticity Finite Element Code
I have written a piece of code solving the linear elasticity problem on transversely isotropic materials (before that, the code only supported isotropic materials).
I would like to validate it before ...
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0answers
78 views
FEA Modelling of wood
I am working on designing an item for my local circus, a teeterboard (essentially a see-saw that people jump on each and it launches them in to the air to do flips etc)
.
I am working to get it ...
2
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1answer
195 views
ABAQUS Analysis: Difference between assigning Section as Plane stress/strain vs. Element type?
In ABAQUS, there are multiple ways to specif your part is in plane stress/strain.
1. When assigning the section, one can specify that it is a generalized plane strain section.
2. When assigning the ...
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1answer
99 views
Cyclic loading on ABAQUS CAE
I am new to abaqus and for my final year project I'm meant to simulate a force on a cylinder (testing displacement of articular cartilage) ranging from 1-15 Hz and between 15-36 Newtons but I don'...
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15 views
what is the quickest way to edit shell thickness from each mesh element in Abaqus?
I am currently trying to edit the uniform thickness in shell element in abaqus to non-uniform thickness for each element according to the mesh size.
I am wondering if there is an easy way to make non-...
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1answer
21 views
How to know which constraints suffer from 'nodes are used more than once as slave node' in abaqus?
I have been struggling to find which node and constraint suffering from 'nodes are used more than once as a slave node' in abaqus error message.
Please help me resolve this problem
Thank you
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0answers
133 views
How to convert solid part to shell part in Abaqus?
I want to compare the same model with solid shape and shell shape,
since my model is big, I am wondering if there is a way to convert the solid part into a shell in Abaqus easily without creating a ...
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0answers
19 views
Simulating Contact Time
I'm using ABAQUS to model the impact of a steel half-sphere with a titanium plate (thickness ~3mm) at a velocity of 1.3 m/s. The test I'm simulating uses an accelerometer to capture impact data which ...
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0answers
221 views
Simply Supported beam with multiple point loads and distributed load [closed]
How can I solve this problem using FEM (longhand calculation)? I want to find deflections at each load point. This is not a homework problem. This is related to a project that I and my brother is ...
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1answer
38 views
How to get all forces and displacements values in abaqus and export it to excel?
I have made bridge model in Abaqus,
I also have done experimental study and I have the load-displacement data from my experiment,
I am now going to compare the results from Abaqus and the results ...
0
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1answer
59 views
How to obtain strain and stress values by editing abaqus input file?
I am currently working on abaqus modeling, I am trying to find a quick way to get the strain and stress values shown in the output file.
What do I need to put in the .inp file? Does anyone know how ...
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2answers
431 views
How to Solve this error message on Abaqus 'time increment required is less than specified' and 'too many attempts made for this increment'?
I am currently working on my dissertation project using abaqus, my model is an arch bridge consisting of a shell and solid elements, there are concrete and steel materials also, I have checked all of ...
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0answers
181 views
Calculate the Euler buckling load of a column using the finite element method
I am trying to find the buckling load of following column:
I started from the system of equations $P = (K + K_g(N))U$, where $K$ is the stiffness matrix of a single 2D frame element and $K_g$ is the ...
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1answer
48 views
Are there other finite element types besides the usual?
By finite element type I specifically mean element geometry.
I am aware of Beam/Strut, Quad, Tri, Tet & Hex but are there other types, eg a hexagonal prism, rhombihedral etc.. ?
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27 views
Plastic failure evaluation of steel using FEM
I would like to evaluate failure in steel using FEM, especially in geometries with stress concentrations (notches etc.).
One possibility is to calculate the stress distribution using a purely linear ...
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0answers
115 views
Beam element stiffness matrix for variable area cross section with mass and shear center not coinciding
I would like to find the full (12 by 12) Timoshenko beam element stiffness matrix for a variable cross section with mass center axis and elastic center does not coincide. I have the full stiffness ...
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0answers
53 views
What is the meaning of repetitive node indices and the 0th node from an ANSYS element list file?
This element list file is not generated by me. Most lines are OK, but I can't understand some of them.
The initial lines are like this:
...
2
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1answer
55 views
In an incremental nonlinear FE procedure does the material stiffness matrix need to be updated?
A typical nonlinear FE problem can be given by:
\begin{equation}
\mathbf{R} = \mathbf{K}\rho + \mathbf{F}_{NL}(\rho),
\end{equation}
where R is the vector of applied forces, K is the material or ...
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0answers
40 views
Can Ansys import parameters
In Ansys workbench is it possible to import parameters with part geometry? Eg. if I create part or assembly in Creo or SolidWorks and define parameters for this geometry, can I export parameters with ...
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1answer
81 views
How to avoid a Contatct penetration in ansys
I am trying to simulate contact between a flat rigid plate and a sphere. I am applying a load on the flat rigid plate and the sphere is flexible. How can I avoid this flat from penetrating into the ...
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2answers
65 views
What is a good method (equation) for locally refining a 1D grid at each end?
I have a grid that I plan to discretize in 1D. It extends from 0 to L using N nodes, and I need to refine it at each end. I plan to have something that looks as follows:
I have tried the to specify ...
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1answer
55 views
Most efficient fillet design given an envelope (for stress)
If one has a specified allowed X length and Y height, into which a fillet can be placed to reduce stress concentrations, is there an equation which can be used to determine the optimal shape of the ...
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1answer
123 views
How to derive deformation gradient or displacement gradient?
In one of my project, I need deformation gradient or displacement gradient for some elements in my model that made by ABAQUS software and I can't find it directly, any suggestion or help would be ...
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29 views
Marching Voxel FEA Mesh
I'm working on an FEA model and my mesher uses a "Marching Voxel method" I'm wondering what the relationship is between mesh size and computation time is? I.e. if I half the mesh size (1mm to 0.5mm) ...
