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Hello,
thanks for your interest in NextFEM Designer. Actually, the program can perform implicit dynamic analysis – there’s no specialization for what you ask.In the next patch your sample model will be supported (when quad with opposite edges are parallel) – otherwise, mesh area command should be used for complex boundaries.
The option is on the material level because otherwise you can assing inconsistent beam stiffnesses. If you need to act to a single DoF (eg. axial or shear only) you can act at a section level (see section properties, Properties tab) by changing A, Avz, Avy, Jy, Jz, and so on.
Hello,
skew elements cannot be divided by this tool. This is because the tool works only on regular elements.Hello,
this is a property of the material. See Materials / select a material and then click on Modify Material… / Tools menu / Set stiffness factor.Just to clarify the process, you cannot duplicate directly a spring property. You cannot also create a spring with the same name (as appearing in Name textbox).
Also, there’s no need to replicate the same spring without NL properties, in linear analyses only linear properties are considered; the NL properties set act only in non-linear analyses.
To conclude, you’re able to create a new spring with a different name by re-setting the properties.
ps.
If your spring don’t have zero length, maybe a local coordinate system (local CS) is suitable for you.For the model: you don’t get 0 stress for the NL model – you’re at time 0, select the last time and you’ll see the results.
ps2
if you’re trying to hang the box by an upper node, maybe you’re looking for a hook spring.Hello,
to correctly use the Spring properties mask, please follow the subsequent steps:
– choose a spring name and then click “Add property”; you created and empty spring
– then, the spring is selected and active on the left box. Change its properties as you wish
– click on “Modify property” to store changes.
By now, removing NL dofs is not supported. We’ll add this to the check list for next updates.For the second issues, please share models to let us check. You may upload them there, or load them at the bottom of the Support page.
Yes, this could be the reason – the option “Shear deformation of beams” is equivalent to assing noShearK=1 to all beams.
Hello,
Pdelta transformation in OpenSees is supported only for elasticBeamColumn and not for ElasticTimoshenkoBeam. Simply add “noShearK” equal to 1 in element properties.
ps.
there’s no change in behaviour of previous versions.It is not a matter of Poisson’s ratio, it will only affects mixed terms of the Jacobian and shear modulus – it’s the same Young modulus valid for stresses in both direction.
To have a numerical proof of what I’m saying, please try releasing x boundary condition on node 2 – you’ll see in results the gradient with a lower sxx around node 2.Hello,
you cannot expect the beam-like behaviour from thermal distorsion in shell elements – the stress is higher since the therma distorsion is applied in both directions and plane directions in shape functions of the shells are tied together, hence you’ll have an additional quota of restrained isotropic stress.ps.
to same the model in the same folder where .py script is, you can use:
# Save the model, including analysis results
dir=os.path.abspath(os.path.dirname(__file__))
print(“Model saved in ” + dir + “\\” + model_name)
nf.saveModel(dir + “\\” + model_name)# Call the app and open the file just created
nf.startDesigner(“\”” + dir + “\\” + model_name + “\””)Dear Luciano,
in shell elements, the uniform thermal distorsion by temperature is applied in both plane directions, hence you cannot expect such value – maybe a monodimensional element is more suitable in this case.It seems you have the command “More stations” active. The display options options is valid only with the standard 5 stations.