# Joel Rodarte

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1. ## What is the difference between JOINTG Reaction forces and Element Stress (1D)?

Hello, What is the difference between JOINTG Reaction forces and Element Stress (1D)? To what i have seen they dont match, when I extract one or another, their magnitudes are not the same? so, what of each of this mean? thank you!

Hello, I have few questions regarding spring in optistruct. 1. How can I load a Cbush o cbush 1D? I know how to stablish the spring K but not a load. 2. Can I choose the direction of the load? Thank you!
3. ## optistruct Shells Normalsin optistruct?

Hello, Today I have a simple question: for shell in Optistruct: Z1 = Top Face = Red Face Z2 = Bot Face = Blue Face Is this correct? Thank you!
4. ## optistruct Solving Linear and Nonlinear Models? Direct / Iterative methods?

I did some research and saw on Altair Documentation that both Linear and Nonlinear models are solved by Direct Methods, Boeing Solver for linear static and MUMPS solver for nonlinear static, My understanding, and what I see on my .out file, is that nonlinear models are solved iteratively instead of direct as documentation suggests; So, my next questions are: 1) NonLinear quasiStatic is solved in an iterative or direct method? 2) What does the documentation mean that the default solver for non linear static uses a direct solver? Thank you!
5. ## Optistruct Choosing Direct and Iterative Process Solving ?

Hello Simon, Thank you for your quick anwer, I did some research and saw on Altair Documentation that both Linear and Nonlinear models are solved by Direct Methods, Boeing Solver for linear static and MUMPS solver for nonlinear static, My understanding, and what I see on my .out file, is that nonlinear models are solved iteratively instead of direct as documentation suggests; So, my next questions are: 1) NonLinear quasiStatic is solved in an iterative or direct method? 2) What does the documentation mean that the default solver for non linear static uses a direct solver? Thank you!
6. ## optistruct Optistruct Choosing Direct and Iterative Process Solving ?

Hello, Is there a way I can have control over how I want the model to be solved? Between Iterative and Direct Method? Can I have control on sparsity matrix? Thank you for your time!
7. ## Center Of Gravity of a SET

Thank you for your help Orasanna!
8. ## optistruct Center Of Gravity of a SET

Hello, I would like to know the center of gravity of a set of elements from my model. Currently I only know how to obtain the center of gravity but for the whole model (post--> Summary) But, how can I make this with a SET? thanks in advance.

10. ## optistruct Coordinate System CORD2R vs CORD3R Difference?

Hello, What is the difference between CORD2R and CORD3R? What are their properties? If I reference joints to a specific coordinate system what would the difference be with CORD2R and CORD3R? Thank you!
11. ## MOTNJG Behavavior doubt?

The pdf shared has the next error mesage: "This attachment is not available. It may have been removed or the person who shared it may not have permission to share it to this location." Thank you for your response Rahul!
12. ## optistruct MOTNJG Behavavior doubt?

Hello, I am using an axial joint and want to to add motion to it. My questions are: 1) Which node moves relative to who? a. Node1 Moves and Node 2 Does not move b. Node 1 does not move and node move 2) If i was to assign a DOF = 1 in MOTNJG does this mean that the node moving wil move in the axial direction of my joint? Thank you!
13. ## How is VonMises strain output in hyperview calculated by Optistruct?

This was what I was searching for! Thank you Farouk!
14. ## How is VonMises strain output in hyperview calculated by Optistruct?

Hello Farouk, WHat do you mean by same critera?
15. ## How is VonMises strain output in hyperview calculated by Optistruct?

Hello, I have corroborated that Von Mises STRESS is output considering this formula, with principal stresses What formula does hypermesh uses for strain? Thank you!
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