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Found 40 results

  1. Greetings Forum Members, I am writing to understand the various result options (especially in stresses and strains) available in Optistruct (or any solver) Post-processing. Usually everyone follows the industry thumb rule of looking at VonMises stresses, Displacement (Mag) and Plastic Strain or equivalent plastic strain. But there are a lot of other result options available but many never seem to use it. I have attached screen shots of the some of the various result options (Stresses and Strains) available below:- Could anyone Kindly go through the above results options and explain the differences between them also establish a understanding of when to use them. For example, 1) what is the difference between VonMises, VonMises (Z1), VonMises (Z2), VonMises (mid). What does the Z1, Z2 and Mid imply? 2) what is the difference between P1 Major Z1, P1 Major Z2, P1 Major Mid and P1 Minor ? Even a simple answer in simplistic terms would suffice. Also kindly share any reference material available in understanding the results? What to look for after the analysis has been completed? Thank you. Best Regards, Bharat Pinapati
  2. Hi all, I want to compare the result of shell and solid element for a thin plate bending analysis. So I select a thin plate with dimension 100*100*2mm, the four edge of the plate are all clamped, and a uniform pressure is applied on the top surface. However, I got a different result from OptiStruct and Ansys with the same solid model. Both the material and the mesh are the same. The in-plane element size is 1.25*1.25mm, and there are two elements through its thickness. The maximum stress in X direction from OptiStruct and Ansys is 74.4MPa and 158.7MPa. It's so different. What's more, according to the theory, the maximum stress may be 154MPa, which makes me suspect the optistruct result. The maximum stress theory for four clamped thin plate under uniform pressure loading is given in following link http://www.roymech.co.uk/Useful_Tables/Mechanics/Plates.html What's the reason for this strange result? I have attached my HM file. In addition, is there any document which explain the different options meaning of stress result type and average method? See figure below Thank you Roy Shell_Solid.zip ShellSolidCompare.hm ShellSolidCompare.fem
  3. Hi there, I've run a simulation of the chassis of a car through Optistruct in Hyperview, and there were no errors and everything seemed to run well. However, upon loading into Hyperview, I am unable to view the contour plots for stress/strain/displacement and the four subcases. I am expecting to get a model like Image 1, however am getting image 2. It is as if there are no loads applied to the chassis. If anyone is able to view the model (file attached) and perhaps indicate where I am going wrong it would be greatly appreciated. Cheers Chassis_scaled_newI.hm
  4. Busra ASlan

    von mises stress in lattice opti.

    Hı, I want to create stress restriction in lattice optimization. So I am changing the value in the image below. But I do not see any change when I check the analysis results. (von mises). Can you help me?
  5. Hello all, For stress analysis, I want to show the stress value of some nodes, in order to make a screenshot for documentation. To do this I put a note on the selected node, and in the note i write {entity.contour_val}. Now the problem is, that i get the value of the selected node and all of the nodes surrounding it. But i only want the stress value of that particular node. Does anyone know what to do? Thank you in advance.
  6. Hi to everybody, i have this problem and i hope that someone is able to help me please. I want to perform the stress analysis of some bodies connected to each other and belonged to an assembly (the assembly is a wheelchair moving on the street) , but the stress only of those bodies not of the whole assembly. I saw that one way is using flex body to model the bodies, and it's the only way that i know to check the stress in motionsolve, but it happened this error: ERROR: Error encountered in analysis! (1) The integration has become unstable. Tighten (decrease) integr_tol, h_max, or both in Param_Transient can help stabilize the integration. If the simulation contains distinctive phases, use multiple Simulate, each with its own proper integrator parameter setting, to selectively tighten the tolerance during the period where instability is encountered. (2) If the simulation was terminated because stepsize has diminished consistently below h_min, reduce h_min in Param_Transient to force integration to continue. (3) Non-physical inertia properties, such as mass=100 Kg and Ixx=Iyy=Izz=1 Kg*mm^2, or extremely small inertia on a part with an unconstrained degree of freedom. Make sure the modeling data, in particular the part inertia and the gravity, are specified in proper units consistent with the units given in Param_Unit element. (4) Beam, flexible body goes out of linear range, bushing has large rotation along more than one axis, curve goes out of its interpolation range, higher-pair joint goes out of the range of U or V, etc. Make sure fundamental modeling assumptions, such as rigid contact assumption used in Force_Contact, are not violated. (5) Motion displacement defined using LINSPL, AKISPL in dynamic analysis, or as a function of model states (DX, VX etc), as well as forces defined as a function of other forces, can cause hard convergence and integrator failure. Avoid these modeling practices wherever possible. has anyone some suggest? or is there another method to check the stress analysis in motionsolve,maybe without using flex body? thank you very much
  7. As far as I understand, the mises stress at the middle of the shell element is membrene stress, and the mises stress at the surface of the shell element is sum of the membrene stress and bending stress. and the hyperview can show the stress of the mid layer and both surface layer of the elements.(Z1, Z2, or Max) How can I show the contour plot of only the bending stress of the element ? I mean that I want to get the contour plot of value of ((Z1, Z2 or Max) - Mid layer ). Thanks for your help in advance.
  8. Timur Soganci

    Nodal Stress Values for MNF file

    Hello, I'm trying to create a flexible body file by using Craig-Bampton Method. I need to write nodal stress values into the .h3d result file. From the global output request menu, I choose the stress option with corner location, then an ordinary analysis that has standard loadstep (for example linear static case) is run, and i can obtain the corner values. whereas, for the flexibody generation case, the nodal stress values are not written in the h3d file. Is there any way to obtain corner stress values in a .h3d result file for a flexible body generation?
  9. ank

    stress in shell elements

    How to understand stress(von-mises) results in case of shell element ?
  10. How do I get the curve points for bi-linear material property for doing crash analysis in Radioss from following data for my AISI 4130 material E- 210 GPa UTS- 735 MPa Yield- 604 MPa Elongation in 50mm GL- 23.5%
  11. Hi, I have a solid cylinder and I need to get the stress results in cylindrical coordinate systems. I already defined a cylindrical coordinate system, but I don't know how to assign it to the elements. I appreciate if someone can help me with this problem. Thank you, Soraya
  12. ank

    strees(t) vs von-mises(s)

    I am performing stress analysis of component assembly having a solid block and a shell plate connected to each other.My question is what is the difference between stress(t) and von-mises ?
  13. Hello I tried to optimize a modell with a lattice structure. This model needs to fullfill a certain stress constraint. The lattice structure is created, but the stress constraint did not implement properly. The full volume does it stick to the stress constraint, but the lattice structure itself does not and achieve too high stresses. What can be done, that the stress constraint is also taken account of the lattice structure. I aded following line to the .fem file: + LATTICE 1 0.1 0.7 10. I thank you in advance for your help!
  14. ank

    Too much stress

    My load is for some small time period say 6 millisecond and i request result for stress result for 12 millisecond.My stresses values rises in later period drastically(almost at the end of 12 millisecond) .What can be the reason for this how i suppose to handle this problem? Thank you
  15. hanifmansor95

    MaxShear vs Tresca

    Hello, Can anybody explain what is the difference between these 2 stress components ; Tresca and MaxShear? I assume that both come from the Maximum Shear Stress theory (Failure theories) so I do not understand the difference between both of them, in which situation they are to be used, etc. Thank you. BR, Hanif
  16. NVH GURU

    How to create Max stress Graph?

    Dear all. i am new to this forum. Now i am working as a NVH engineer (fresher). i am using Nastran solver to conduct vibration analysis. Myquestion: In frequency response analysis. i usually apply 0hz to 250 hz to the structure and i measure the maximum vonmises stress at each frequency. so is there anyway to plot a graph or track the maximum von mises stress at each frequency. P.S.: 1. live tracking the stress at a same node is easy. (but it will give the stress value at that node for different frequencies.) -> BUT I WANT THE GRAPH like Example: at 1hz - the max stress is 2 Mpa. at 2hz - the max stress is 5 MPa. at 3hz- the max stress is 10Mpa. . . . at 250 - the max stress is -- Mpa. like that ( irrespective of the position , i need only the max stress) is there anyway to plot or track the max stress. please share it with me. (if anyone cant understand my question. please let me know. i will try to explain better or i will give you the input and output files.) thank you. anticipating for the answer.
  17. Hello, I have a question. Why in tutorial RD-3595: Three Point Bending the exercise expected results stress is upper than strength material. For example stress in solution is 1,203E+03 (Mpa) so it's 1203 MPa and the Rm (ultimate strength) Elasto-Plastic Material /MAT/LAW36: Inner, Outer and Flat is 400 MPa? thanks for answer
  18. Hello everyone, We have to create a fully automated tool that takes the user inputs and solve a defined problem using hypermesh, optistruct and hyperview. I can run hypermesh and optistruct to solve a simple problem yet I can't program anything to display results with hypermesh. I would like to display displacements (i.e. plot them) and capture the graphical area to later import it in the matlab GUI. My understanding is that I have to use the Altair reference guide. My idea is to use the polContourCtrl command. So far I have : hwi OpenStack #Session hwi GetSessionHandle sess #Projet sess GetProjectHandle proj #Page proj GetPageHandle page 1 #Window page GetWindowHandle win 1 #PoiPost win GetClientHandle client #Model client GetModelHandle test 1 #Résultat test GetResultCtrlHandle res #Contour res GetContourCtrlHandle con hwi CloseStack Obviously this does not work. What am I missing ? Thank you.
  19. Hi all, I am trying to perform optimization in Radioss through -radopt command. The trouble is that computation terminates at the end of first outer loop when stress response is used: I have attached files, if anyone would like to check it out. test1_0000.rad test1_0001.rad test1.rad
  20. Hi everyone, I have a question about how the interlaminar stresses are calculated in shell element. I cant find it in the software documentation I have. The thin shell element model does not calculate the interlaminar stresses or shear stresses right? So there is a need to calculate it in another way, does it uses the equilibrium: xTension/dx + xyShear/dy + xzInterLamShear/dz = 0? What about in the free edge, does it assume zero there? What's the failure criteria used? Is it a quadratic considering both xz and yz InterLamShear or just linear? Sorry for so many questions but I need to justify this in my master thesis. Thank you very much, Best regards Gonçalo
  21. Hi, i built a model with Laminates, so how can i see my stresses in the plies. I want to know my stress in the facesheets and the honeycomb plie. Thanks for answering, hubéry10
  22. Mohamed Khalid

    Orthotropic Material type for ply

    Hi everyone, I am trying to model a helicopter blade, i have imported the CAD model.. etc until i created Plys. whenever i set the material type to orthotropic and hit update, at the bottom left it says "cannot compute material normal" and when i go back into the ply, the material type is back again to "all". would you be able to help me with this issue? Kind Regards, Mohamed
  23. Mohamed Khalid

    Inter laminar allowable shear stress

    I am modelling a helicopter blade, with a leading edge mass ballast. I am not sure how to get a standard value for the inter laminar allowable shear stress value for unidirectional carbon fibre. Additionally, how would i model the allowable shear between the metallic mass ballast and the carbon fibre ontop of it? Kind Regards, Mohamed
  24. Arul

    Stiffness calculation

    Is it possible to calculate the Stiffness (N/m or N/mm) of the structure from any analysis??