September 20, 2018 at 1:51 amashish35Subscriber
After importing the stress tensors from residual stress solution of ANSYS additive, I need to allow the body to deform in one load step and then add another load step with different boundary and loading condition in a new analysis. How can I define a step for imported initial stress and add another step with different BC? Any help would be appreciated.
September 20, 2018 at 11:40 amSandeep MedikondaAnsys Employee
Ashish, moving this to the correct thread so that it will get more traction.
September 20, 2018 at 3:30 pmSandeep MedikondaAnsys Employee
If you can stay within Static Structural, you can use "User Steps" available under the AM Process Sequence and simply add steps to their analysis without moving in and out of Mechanical. Additional info on AM User Step.
September 20, 2018 at 4:16 pmashish35Subscriber
This is all the steps I can add in the Static Structural step:
1) Build Step
2) Cooldown Step
3) Basse Removal Step
4) Support Removal Step.
Regardless of this, since AM module uses voxel meshing system, my professor is skeptic about using the same mesh to predict stresses due to external load because we do not usually see stress convergence with that mesh.
So I have mapped out the stresses generated by AM module to a new mesh (which can represent the correct geometry) using "External Data" tool to a new static structural analysis. My concerns are:
1) the mapped out stresses should produce the correct deformation (which I have checked and it got the approximate value and it's fine for me)
2) Now, I need to add boundary condition and an external load to the deformed geometry.
My question is, if I just add new BC, external load and imported initial stress all at once, how does ANSYS take this?
If it is incorrect to do that, how do I use imported initial stress in one time step and apply new BC and external loads in another?
September 20, 2018 at 4:38 pmSandeep MedikondaAnsys Employee
Ahh yes, This is new in 19.2.
I remember your question on correct deformation from your last post.
I don't think it is a problem since you are applying BC to the part you have already built. It's just like any other structural analysis with the exception that you are starting with a residual stress in your part.
An easy way to apply initial stress to nodes would be to select the elements for given material id and then selecting the nodes associated with the selected elements and then using inistate for nodes.
Also please note that to get the same stress state and reactions, you need to read in elastic strain, plastic strain, equivalent plastic strain and plastic work, but do not read in the stress.
If you do read in the stress, then you should not read in the elastic strain, but you still need to read in the plastic strain components listed above, because the plasticity is not fully represented otherwise.
September 20, 2018 at 4:55 pmashish35Subscriber
Yes, we are yet to get the 19.2 version. Does this version also have newly added AM materials?
Could you please explain me how do I use the INSTATE command? Is it different from transferring tensors from "External data"?
September 20, 2018 at 8:50 pm
September 28, 2018 at 11:09 pmashish35Subscriber
Could you please provide me equations that I could feed into user defined result for plastic strain components and plastic work?
September 29, 2018 at 3:44 amSandeep MedikondaAnsys Employee
First of all, I am not sure what equations you are referring to? but any or all equations that I am allowed to provide will be from the manual.
Also, please note that user-defined subroutines are not a supported feature (typically of any commercial product that I can think of, not just ANSYS).
October 5, 2018 at 11:46 amAshish KhemkaAnsys Employee
I think that you are referring to User defined expressions for Plastic Strain Components and Plastic Work. Please refer to the Worksheet tab after clicking on the Solution, which will list all the available expressions.
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