"Under the quasi-permanent load, the long term deflection should not exceed span/250, in order to avoid impairment of appearance and general utility"
What would be the span in my case? Would it be the height H since it is along this path the wall will deflect?
It has you guess a value for "H", then on the second line we see the "H" is part of an equation "L", and I am guessing this "L" was previously defined? Then "find(H)", finds a new value erasing the guess of 1 kN?
Imagine a cable like this pinned at each end; I am looking at a table and it says the temporary elasticity modulus is about E_i = 35GPa, while the permanent is E_p = 50 GPa. Should this not be the other way around? I would imagine as the cable has just been installed and is extra stiff and...
Say I have a buckling model with linear elastic material, and I have a similar model but with nonlinear material data and geometric nonlinearities - which model would most likely have the highest stiffness?
What effect would turning geometric nonlinearities on have on the stiffness of the model?
When doing a nonlinear buckling analysis (where you have geometric and material nonlinearities), why do nonlinear effects usually happen at lower loads compared to when doing a linear buckling analysis?
Edit: Trying to understand this comment: "Yes, i.e. in plate bending LBA will see a lot of...
I did extensive work on the unit cells where I find the youngs modulus, bulk moduli, degree of isotropy, buckling and yield strength. I then modelled two [3x3x3] structures of these unit cells where instead of using linear material model I use hyperelastic material model and enabled geometric...
I am running something called cell periodicity study in comsol, which finds the material properties of a model. It is done by applying a uniaxial compression load, and performing a nonlinear buckling analysis - this gives the stress strain curve you see below. You can think of the material being...
I am doing linear buckling analyses (where everything is linear), and nonlinear buckling analyses where you have nonlinear geometry enabled and nonlinear material behavior (hyperelastic material). Everything is done in COMSOL. The structure is fixed on one side, and a forced displacement of...
I perform a linear buckling analysis for two similar geometries, where one model has thickness t = 0.01 m, and the other has thickness t = 0.035 m. Otherwise everything is exactly the same. The thinner model (t = 0.01m) however gives me a higher critical buckling load compared to thicker model...
I am doing a linear buckling analysis and having trouble with it as the solver used in the buckling study cannot find any eigenmodes, so I dont get buckling mode or critical load factor. I keep getting the error
"The following feature has encountered a problem:
- Feature: Eigenvalue Solver 1...
I have a linear buckling model where the thickness is t = 0.005 m, here I get a buckling mode shape with the corresponding critical load factor as seen on the right:
But I change the thickness to 0.035 and run the exact same model again, but dont get a buckling mode or critical load factor...
Context: "... The corresponding stress state of element e is obtained by the superposition of the six perturbation fields induced by the six unit strain field...."
When I google I get a lot of results for perturbation theory, but none for perturbation field. The topic is related to...
I am trying to do what is mentioned in this paper, except using arc-length method, I need to do it with Newton-Raphson method:
They use Lagrangian approach in this paper, which I will also do:
And arc-length method, but I need to do it with Newton-Raphson method:
Are there any papers out...
I am working in a programme called COMSOL, and trying to do a nonlinear analysis. I came across this text on their website and was wondering if they are talking about Regular and the Modified Newton-Raphson method? If so, is Automatic (Newton) equivalent to Modified Newton-Raphson method?
From...
Screenshots below show how the load is setup; however I fail to visualize in my head how this load acts on the structure. This is a cell periodicity study that does representetive volume element and periodic boundary conditions for microstructure, and I have been told its supposed to be uniaxial...
In the first picture χ_α is defined as "the perturbation field", and in the second its "element test fields". I am trying to make sense of it, but I dont see what is meant by it nor what it does, could someone give me their interpretation and maybe it would make more sense?
From my model, I get that the volume fraction of the figure highlighted in green is 4.6%. Does this look reasonable? I want to get it to 20%, but increasing thickness, length etc of the figure only increases the volume fraction a bit. I am not sure if my model is wrong or if the figure actually...
From "https://www.brown.edu/Departments/Engineering/Courses/EN224/Kinetics.html"
"The components of the first Piola-Kirchhoff stress are the forces acting on the deformed configuration, per unit undeformed area. They are thought of as acting on the undeformed solid . The second Piola-Kirchhoff...
