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Questions tagged [finite-element-method]

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Model Reduction - ANSYS

I am trying to reduce my model in ANSYS using Craig-Bampton Method. My ultimate goal is to read system matrices, stiffness, damping and mass matrix with MATLAB. I have been researching for a while, ...
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13 views

Curve-linear vs. Cartesian coordinate systems: linear-elastic & isotropic elasticity tensor

For shell elements, is the elasticity tensor for linear-elastic & isotropic materials the same in a local curve-linear (convected) system vs. a local Cartesian system? I wonder because ...
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2answers
47 views

Viscoelasticity and Hyperelastic model, history and difference

Actually, I see some papers use viscoelasticity or hyperelastic model for the same materials. It seems to me that those models were invented in different eras, and the hyperelastic is a newer model ...
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1answer
27 views

Meshing Complex models in abaqus

I'm trying to mesh a model of a morphing wing in Abaqus and have been running into issues. It was recommended that I partition the model into smaller parts, but it seems that the more I try to ...
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1answer
27 views

Boundary Conditions fro Static Structural Analysis of a Turbine Rotor Using FEM

I am trying to perform static structural analysis of a turbine rotor which is rotating at a given angular speed, say 1000 rad/s. I also know the pressure distribution from CFD analysis. What are the ...
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1answer
62 views

Should one use multiple elements through the thickness with multiple materials?

To get realistic results from a FEM calculation, it is common (or so I've been taught by someone who may not be up to date) to use at least four or five elements through the thickness of a beam or ...
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12 views

Bolted joint junker test with finite element method

Anybody knows a tutorial to make a finite element analysis for bolted joints like junker test(fastener vibration) in Solidworks or Ansys?
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0answers
17 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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21 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
29 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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1answer
30 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
37 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
64 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
30 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
43 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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0answers
28 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
33 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 ...
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1answer
34 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 ...
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1answer
62 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
20 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
23 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 ...
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1answer
27 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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35 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
44 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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0answers
24 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
238 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
40 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
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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
33 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
47 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
47 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 ...
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1answer
27 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
95 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 ...
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1answer
303 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
123 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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0answers
19 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
25 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
162 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
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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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337 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
47 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 ...
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1answer
69 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
613 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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245 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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28 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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146 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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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: ...