Sorry, I was assuming the classical plasticity model. Maybe the pressure contribution in the DP model will keep the elastic strains small, but you definitely can't use e=e_elastic+e_plastic approach alone as you are doing for calibration.
You're in a world of problems here....
First your stresses are similar to your elastic modulus so the additive decomposition (e=e_elastic+e_plastic) is a no-no. Second, your elastic strains seem to be large, so you can't use the built-in Abaqus plasticity models with a linear elastic material...
Unfortunately I don't see how you will automatically get an element connectivity array with just a set of nodal data in Abaqus. Have you considered using python to directly control the CAE geometry kernel. If you set up your geometry carefully (use some clever partitions etc.) you might be able...
The strains in some of your elements when it fails are over 100%. This is almost certainly your problem. You could address it by using more realistic boundary conditions or maybe a better mesh in the highly deformed region. I don't think you can use adaptive meshing for your problem...
I agree with the above. Based on the description of your model you should be using Standard. Check your units and boundary conditions (make sure there are no unconstrained rigid body motions).
Your approach seems fine to me. I use wire constructions like that all the time without using the sketcher/datum planes. Sometimes the sketcher and extrusion tools just isn't flexible enough for making complex shapes. If the structure is taking a long time for you to make you could use scripting...
UMESHMOTION is for use during an analysis with ALE adaptive meshing. It isn't really of any use in a python script. I think I misunderstood what you were trying to do in my last post. It seems what you are doing is all pre-proccesing to generate a model?
In this case I guess you need some...
If you have an elastic material and you do not maintain the loading that caused the pre-stress from the static analysis then that pre-stress will quickly decay in the explicit analysis. Is this the case for you?
To do a quasi-static analysis in explicit you just need to apply your...
Yes you will need two fibre directions for the HGO model for your curves. The paper 'Determination of layer-specific mechanical properties of human coronary arteries with nonatherosclerotic intimal thickening and related constitutive modeling' describes how to fit a version of the HGO model (a...
You could either do a 'quasi-static' analysis with the explicit solver to apply the pre-stress and then in a second step do the wave propagation analysis. Otherwise you could use the import (not restart) option to bring the stress-state from Standard to Explicit.
Do you need the results to be available during the analysis or just for post-processing of results? If its the latter then life will be a lot easier. You could for example create a set of nodes expected to come into contact on each part, then in the ODB loop through the nodes of one of the sets...
I'm not very familiar with the Fung model so can't really help much regarding the stiffness matrix. If you can get your hands on Abaqus 6.12 the HGO model is available in CAE, maybe it will make life easier since the 'out of plane' behavior will be automatically given by the isotropic...
I'm not so sure about the Abaqus implementation of shells. However, I think the 'out-of-plane' properties are used by Abaqus to determine the shell's 'transverse shear stiffness'. Also 'D' (as it is in the Abaqus manual) is not the response to thermal load in the Fung model. It is a measure of...
Would it not be easier to implement the neo-hookian model in the UANISOHYPER_INV routine? I think you might have problems getting Abaqus to call both UHYPER and UANISOHYPER_INV for the same integration point, unless you overlay elements or something.
Not for the method I have suggested. You should bear in mind that when you are modelling the stress strain behavior with the linear elastic-plastic law in abaqus you are assuming an initial linear elastic behavior, immediately followed by plastic behavior. Of course this doesn't really happen in...
