All Questions
Tagged with structural-engineering finite-element-method
48
questions
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13
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How to model fibre reinforced concrete on LUSAS?
As part of my dissertation, I need to cross verify my finite element analysis results using LUSAS using some experimental results, and although i can find some stress-strain relation in some articles, ...
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0
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23
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Is it OK to separate fire and structural analyses when analyzing a fire induced building collapse?
This is from NIST NCSTAR 1-6
It seems to me there are problems with this approach. The heat distribution depends on fire spread and ventilation paths, which in turn depend on the shape of tjr ...
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97
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Comparison between hand calculations of a continuous beam with FEA simulation (Solidworks)
I've seen many videos and books where statically determined beams' hand calculations are checked using FEA. But why is it that FEA results don't match the ones obtained using hand calculations (in ...
- 15
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vote
2
answers
311
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A benchmark to check the validity of a finite element analysis
Is there any well-established benchmark to test the validity of a finite element analysis, i.e. FEA? For example, a 3D model with specific loading and boundary conditions. Along with the expected ...
- 151
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254
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Lifting a table using linear rails and linear actuators
I'm trying to design a coffee table for a tightly constrained space that can lift up to become a dining table. I've drawn the CAD for this design, but I'm concerned that the moment arm on the linear-...
1
vote
1
answer
919
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How to find clamping force from bolt preload?
If I have a piece of rubber between two steel plates, and four bolts (at equal preload) compressing the plates, will the total compressive force on the rubber be Preload x 4?
- 25
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1
answer
281
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Is the calculated shear strain in a beam, engineering strain or tensorial strain?
Recently I came across a FEM code of a linear deformation beam element, and it made me wonder what is the correct relation between shear stress and shear strain in a beam element.
In the beam element ...
- 123
2
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2
answers
2k
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Which yield strength should I use in FEA in ANSYS; Engineering or True?
Attached is a figure to illustrate the difference in the value of yield strength as observed from the true stress/strain curve and engineering stress/strain curve. While conducting FEA in ANSYS for a ...
- 1,365
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1
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1k
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Stress Concentration Factor – Why a Specific Range?
I was trying to find the stress concentration factor for a specific situation and I found two different resources for it.
Ref: Shigley's mechanical engineering design
Ref: Roark's Formulas for ...
- 245
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1
answer
55
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Mesh generation in FEM [duplicate]
When a frame structure is analyzed using a FEM computer software, does the program still generate mesh, even as a line mesh, on frame members, or we must do it ourselves?
- 462
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387
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Does Finite Element Method use direct stiffness method?
Does Finite Element Method use direct stiffness method? Or it is another mathematical method? We definitely use direct stiffness method to solve frames. FEM is based on entirely this or depending on ...
- 462
-1
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2
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499
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Representing slabs in FEM
When making structural analysis with FEM, do we normally use plate or shell elements to represent slabs? I checked and did some reading for the difference between shell and plate elements in FEM in ...
- 462
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3
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65
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How to solve a system of second order ODE from time t = T to t = 0
I have a system of second-order ODEs
$$
\mathbf{M\ddot{x} + C\dot{x} + Kx = f}
$$
I want to know some good numerical methods to solve this system of the equation given the initial conditions at time $...
- 101
1
vote
1
answer
857
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Free pre-processor for Nastran?
I want to do a non-linear analysis (possibly SOL 400) on Nastran. I used PyNastran (python module) to set-up the BDF file for a Linear buckling analysis (sol 105). However I feel like it might be too ...
- 67
1
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1
answer
96
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How would I do a buckling analysis with an additional fixed known lateral force?
I am using Nastran for buckling analysis, and I'm new to all of this so please bear with me.
For a linear buckling analysis, I understand that you must first apply any compressive load in the static ...
- 67