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Found 393 results

  1. Hi , I am working on modal analysis of rotor system in optistruct. I have queries regarding constraints. Pls find the following image which shows rotor assembly with bearing. I need to allow rotation free of rotor and shaft at bearing locations. How to give constraints at bearing locations ? Using RBE2 or any other options are there in Optistruct? Thanks Arul
  2. Hello Is it possible to model a 1D element that fails in either tension or shear? I would like analyze a breakaway feature on a structure that absorbs a portion of the impact energy and breaks off. Fracture can be either in tension (i.e cable) or in shear (i.e shear pin). Thank you
  3. Hi, I want to set the damping in the contact. Error message is as follows. I don't know what is wrong. What should do I set something?? Please advise me. Thanks.
  4. Hi, I am trying to simulate a bird impact on a plate with RADIOSS. So I am creating my model on hypermesh now, i chose to consider the bird as a fluid with a density of 438 kg/m3. I would like to work with SI units and the dimensions of the bird are : 0.1325m long cylinder with two hemisphere ends having a radius of 0.075m. I am now trying to mesh this geometry with the SPH module in hypermesh. So i entered a pitch of 1e-3m and a density of 438kg/m3 as i said before. But when i create the mesh, nothing happen and i only get this message "0 mass elements created". I attached my file with the topic. I don't know what could be my error, more of that I tried to do it using mm instead of m and it worked... But I really want to use SI units. Thank you in advance for your help, Gaspard. BirdStrikeSI.hm
  5. Hi, As shown in the figures, When I export 0000.rad file from .hm file (1st figure) and I import 0000.rad file, Rbody checking is removed and component name is changed(2nd figure). (RBODY -> RigidBody8) Why it happens? If I run this 0000.rad file, is it wrong? Thanks.
  6. Hi, I want to use /PRELOAD but I can't find it. I can't find it in load collectors. (I use RADIOSS 2019) Thanks
  7. Hi, I'm beginner of RADIOSS. I want to set the structural damping of steel. But I don't know how. I think there is no setting for structural damping in /DAMP , What should I do? Like OptiStruct(PARAM, G) , is there any card? Thanks
  8. Hello I am using RADIOSS to simulate a crash test which I have previously done. The trajectory of the impactor before impact is complex and requires several linkages and mechanisms to set up. The area of interest is the post-impact behaviour (stress/strain) on the target component, as well as the trajectory of the impactor. When I run the impactor by itself, to see the launch trajectory, I get a reasonable run time of about an hour. When I run the impactor with a simplified initial velocity + the target with all the contact and failure cards defined, I get a reasonable run of about 3 hours. When I run the full model: impactor with the initial trajectory + the target with all the contact and failure cards defined, I get a run around 12 hours to reach the impact, and another 12-24 hours to get results from post impact trajectory. I believe this is partly due the finer mesh required for the target model. I was hoping there is a way I can split the analysis in two, using the results from a the first as an initial condition for the second. Consider the following scenario: Model A: Simple model with only what is required to set off the trajectory of the impactor. The target is not modeled. Run from T=0 to T=T_impact. The run is stopped at the moment where the impact would have occurred. Model B: The target, with finer mesh and contact and fail definition is introduced, and the analysis is "RESTART" picking up from where Model A left off. In other words the target (with finer mesh) only appears just before impact onwards. This should theoretically cut down the majority of the analysis time. Is there a way to set up a RESTART file with introduction of new elements / properties / fail cards, and linking it to a "Stopped" run? I hope the diagrams attached illustrates what I'd like to do. Please let me know if there is a way to do this. Thank you. Best Regards, MN
  9. Hi everybody, could anyone suggest me how I can import stress from moldex 3D in radioss? Or, if it's possible to initialize stress with fields->value from .csv Thanks a lot.
  10. Hi, How to Clear the temporary nodes? Find the following Image. It is not cleared even it I use the option ( Shift +F2) and it is showing in Post processing. Is there any other way to clear?
  11. Im attaching the .rad and .out file. fullcar.hm_0000.out fullcar.hm_0000.rad
  12. Hello, I'm trying to create a simple model of a tensile test for composite material. I have data from a real tensile test and i want to compare the data of the force/strain diagramm with the simulation model. To realise that i tried to read the output data of the nodes with the /TH/NODE card for die displacement and the /TH/SECT card for die forces. My problem is that i don't get any data for the forces in the T01 file. The Question is now: Is my defintion for the cross section incorrecton? Greetings Eugen Tensile Test.rar
  13. Hello, I would like to know what kind of beam I should use for my simulation and I struggle to find the differences between the P18_INT_BEAM and the P3_beam. I saw that in bending, the bigger the deformation get, the bigger differences are between the two kinds of beam. Could somebody give me more informations about that ? Regards, Camille
  14. I am getting errors in RADIOSS when I tried to simulate the crash model that has been exported from HyperCrash. ERROR ID : 286** ERROR IN INPUT CONSISTENCYDESCRIPTION : QUAD ARE NOT COMPATIBLE WITH N2D3D=0 ERROR ID : 760** RADIOSS STOP DUE TO INPUT ERROR What would be the solution for these errors? I cannot share the model due to the confidential issues.
  15. 嗨, 我使用教程RD-3030模態進行沖擊分析使用Hypercrash radioss V14,然後我嘗試使用自己創建的模型,兩個模型都使用相同的設置,元素大小邊界條件等等,但作為圖如下所示,能量平衡顯示不同的尺度,我該如何解決這個問題呢? 感謝您的回复! 順便說一句,作為參考,我將引擎文件設置為動畫輸出頻率:0.001,時間歷史輸出頻率:1E-005。
  16. Hello everybody, I have some problems with stress initialization simulation of solid element: I'd like to do a simulation made of two step where the second step shall take into account strain and stress of first step. I have try to use \inista but there is something wrong because in second step, at first frame, the part have no stress. The procedure I have used is: - STEP I: /IOFLAG - eport solver deck from HyperView for the deformed shape - STEP II: /INISTA In attach the file .rad of simulation. Thank you in advance for your help! Marta CUBO_stepII_0000.out CUBO_stepII_0000.rad CUBO_stepII_0001.out CUBO_stepII_0001.rad CUBO_deformato.rad CUBO_stepI_0000.out CUBO_stepI_0000.rad CUBO_stepI_0000.sty CUBO_stepI_0001.out CUBO_stepI_0001.rad CUBO_stepI_0006.sty
  17. I'm trying to run an analysis in Radioss and I get an "Error ID 54". Together with some more errors and warning. I attach the .out file (complete) ERROR ID : 54 ** ERROR IN INPUT FORMAT DESCRIPTION : IN BLOCK : 581 588 589 590 591 592 593 594 595 596 Thanks for helping new_0000.out
  18. Hi, I've done a form simulation in Hyperform and I would like to import the .sta file in a new simulation made with radioss block, but when I run the second simulatio an error occours. The error is: ERROR ID : 1101 ** INPUT ERROR DESCRIPTION : CANNOT OPEN INCLUDE FILE SOLUTION : PLEASE CHECK IF INCLUDE FILE LIES IN THE DIRECTORY Could someone halp me? Thank you in advance
  19. Hi, Is it possible to apply an incremental load in Non-linear implicit analysis using optistruct? Regards, Arul
  20. Hello , I am new to Radioss solver. Actually using it first time. I wanted to run a analysis for imposed displacement. Is there any tutorial available step by step. How to assign material, how to assign BC , loadstep, control card necessary for analysis. I have attached picture of which I am going for analysis.
  21. I'm trying to run a crash simulation and have encountered the element distortion/extrusion shown in the attached image. I don't know the correct terminology for this so it has been difficult to find solutions online. I believe it is caused by the contact interfaces and I have enlarged the gap min and told the nodes of deleted elements to be removed. There is also failure criteria which seems to have been ignored for these elements because they should have failed and been deleted. Any help would be appreciated.
  22. 有限要素法では要素毎の計算がいろいろと必要になります。例えば要素の応力から要素節点の節点力を求める、陰解法であれば要素剛性マトリックスを作成する、といった計算です。この計算では、例えばトラス要素であれば節点力は応力σに断面積AをかけてAσ、要素剛性はといった形で簡単に計算できますが、シェル要素やソリッド要素では要素の面積や体積での積分計算が必要になります。ただ一般の4角形や6面体の複雑な形状で直接計算を行うのは大変なため、一旦、これらの形状を正方形や立方体に写像を行い、定式はその写像された形状に対して行う、といった事が行われます。こうした要素をアイソパラメトリック要素と呼びます。 アイソパラメトリック要素では、4角形要素であれば、一旦-1から1の正方形領域に写像を行います。そうすれば、要素面積での積分は ここに、 という様に-1から1のξ、η平面での積分に置き換える事が出来ます。この面上での積分には通常、次に述べるGaussの数値積分が用いられます。
  23. Hi All, How can I decide the event time for Explicit simulations? since the actual event time will cost computing time By thumb rule 0.3 is the event time for quasi static analysis. Its derived from the natural frequency of the system/part. My doubt is whether I should consider the natural frequency of the entire assembly or the individual part under study? Thankyou N.K
  24. Dear Altair support team, Mr. Rahul R., I am working on optimization the vehicle crash box, I have some question about Hyperstudy / Hypermorph coupling for shape optimization. As first figure below, I created 2 Shapes (yellow and green) by translating the handles in -X,+X direction to increase the taper angle. In HyperStudy, I defined the model type as HyperMesh, while I am importing input variables from HyperMesh, they ask me to identify the lower and upper bound once (as second figure below). In this study, I would like to have the design variables including crash box thickness, shape1 and shape 2. Question 1. I seperated the shape into 2 because I have no idear to handle with them, can there cause any problem further? 2. If I want to keep the handle distance (+10,-10 in x direction) which is defined in the HyperMesh, Should I set up the input variables as following? Variable 1 (dv_1) Lower= 0, Nominal = 0, Upper = 10 Variable 2 (dv_2) Lower= 0, Nominal = 0, Upper = -10 Are there correct? Thank you for your calification. Best regards, Wisawanart
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