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Found 424 results

  1. Hi I am trying to simulate ship collision with Failure criteria. For that I tried with simple plate impact simulation. I used Johnson Failure prop. Difficult to input the value D1, D2, D3.... Anyhow managed to input it from example given. But don't know the significance of these inputs. Than the ERR shows very high as attached image below. The animation also shows some unusual behavior. I tried with Ixfem=1 (as i want to see the proper cracks formation), but it shows error, so goes with Ixfem=0. Attaching the deck also. Please check any error it it and suggest your valuable comments and any modification needed. Thanking You. Bow impact.zip
  2. Hi all, I'm performing a dynamic simulation using RADIOSS solver. I'm creating this kind of model : I used a COMPSH material law and an SH_ORTH property in order to model an "equivalent material", with a 4 mm thickness. When I run the analysis, I've issues regarding penetrations in my model. Nevertheless, when I want to fix them using the Penetration Check tool, elems are totaly deformed. Could you please help me with this model ? Best regards, Raphael
  3. Hello all, I'm starting praticing on Radioss/Hypercrash by using Altair tutorial. Particularly now, I'm doing this: Tutorial doesn't explain how to launch the analysis, so I went to the help on line I tried to follow the instructions of the "manual method", but it doesn't work. May be I'm wrong typing something. I browsed in the directory: the directory is with in the files: So I tried to "lounch starter for each domain": I press enter and the answer is: Translating from Italian "'C:\Program' is not recognized as an internal or external command, operable program or batch file" Please can you help me? Thank you Franz
  4. Hello, I have a suspension arm with a ball joint modeled in Radioss. My ball joint is modeled as a beam element connected to a zero length SPRING2N with very high translation rigidity and 0 torsional rigidity. I would like to be able to show the reaction force acting in my SPRING2N as a vector to appreciated visually and in one glance its orientation in space. I can use an output block /TH/SPRING to plot the magnitude but this does not provide the orientation. I tried /ANIM/VECT but none of the options seem to offer what I am looking for. I also tried /ANIM/SPRING/FORC, but I can't find "where" this result is plotted (vector, contour?). Any help on how I can do what I want? Thanks
  5. Hi, I'd like to model a box floating in open water, that means that wave generation and especially wave absorption should be modelised. I've modeled this on Hypermesh with the solver Radioss In this model, there are 2 sorts of interaction : - fluid/fluid : air with water - fluid/structure : both fluids with the box. First, I've used an ALE model for the fluids. I've tried to use both MAT/LAW51 (multimaterial) and MAT/LAW37 (biphasic material) in order to model this, but everytime there is a leakage and the computation can't run until the end (negative rho error). I've also tried to use MAT/LAW11 (bound) because it doesn't work properly with a biphasic material (negative rho error). Then, I've tried with an SPH model with IN and OUT condition, so that the computaiton doesn't take into account the air/water interaction, the computation also stops because of a leakage. For the fluid/structure interaction, I've used INTER/TYPE18 and INTER/TYPE7 respectively for ALE and SPH model. I have to set a STfval value for the stiffness. I use the formula of the Help page : stfval=rho*v²*A_el/GAP = 66.667avec - rho=rho_water = 0.001g/mm3; - v=10 mm/ms , initial velocity of the box when it is dropped in the water; - A_el = lagragien element surface =500 * 500 mm² ; - GAP= 1.5 * E_el = 1.5 * 250 = 375mm With this value, the box is floating in the air, the only way i've found a value that models reality was by dichotomy.. That's not convenient for further simulation with different initial data.... Should you have any suggestion to model an infinite water volume (so wave absorption) and for the stiffness value, please contact me. Sincerly yours, Emmanuelle
  6. Sir, I want to perform a crash analysis on an inflated structure. The problem I am facing is about the type of MONVOL to choose. Since its not exactly an airbag, I doubt whether GAS Monvol is to be used. I have performed a simulation with the inflated structure(MONVOL-GAS-Pint-0.2MPa) whose purpose to absorb the energy of impact and prevent the damage to a bullet and a target vehicle. However the postprocessor is showing no deviation in K.E, I.E and Hour glass energy. Even the contour show no particular deformation. How can I quantify the energy absorbed for the same in that case?. I only want the energy absorbed data of 3 bodies, kindly suggest me a solution. I am attaching an image of the hyperview( used monvol-airbag). Is it necessary I give airbag effect or can I move forward with Gas monvol? airbag_2[1].avi
  7. Hello Everyone, ] was trying to perform a drawing simulation on a simple part. I used radioss incremental auto process. I chose to setup a tool with the die surface but it gives me errors with few of the parts that I tried. What things should be considered while setting up a tool from the die surface, currently I just select the outer surfaces which act as die holder? Can anyone please shed some light on this topic?
  8. Hi, I'm trying to simulate the interraction between a box and waves in the sea. Thus I'm using the material LAW37 (BIPHAS) in order to model the interface between water and air which are modeled in ALE. The problem is that I don't know how to model the boundary conditions on the transverse faces in order to avoid wave reflexions on the wall (to simplify the computation, all DoFs are fixed on the longitudinal faces). I can't use MAT/BOUND (LAW11) because it doesn't work properly with the LAW37. So i'm trying to model these boundary conditions using a material LAW37 to create an "air outlet" and a "water outlet" with the same initial values as air except for : -the liquid bulk modulus C_Liquid = 0.0 - gamma = 0.0 The computation runs well at the beginning and i get a pressure gradient in the fluid volume, so it's okay. But then an error appears : " STOP : NEGATIVE RHO=-0.1322538772563E-09 FOR 3D-ELEMENT ID=3696 ERROR TERMINATION " In the results file I can see that there is a problem with a really big velocity vector on top of the volume in the air part. I think this is linked, but I don't know how to avoid this. Moreover, to model the interface between the box and the water, I use INTER/TYPE18 but I don't know how to set the right value for the StfVal. Using the formula written in the Hyperworks Help i.e. StfVal=(rho * v² * Sel)/GAP , the box is floating in the air, and not in the water. Do you have any suggestion? Thank you very much in advance, Hereby the .rad file ALE_05a_0000.rad
  9. Dear All, how can i impose load in radial direction as shown below regards, Ganesh m
  10. Hello all! I'm newbie in HW products. Please, who could help about option like *imperfection in abaqus. I want to do buckling analysis, and use initial displacement in nonlinear analysis with load bigger than critical. Sorry, guys, my english isn't well.
  11. Sammed

    ERROR 760

    Sir, I'm performing dynamic analysis in radioss, it gives following error:- *********************************************************************** ** ** ** ** ** RADIOSS STARTER 2017.2 ** ** ** ** Non-linear Finite Element Analysis Software ** ** from Altair Engineering, Inc. ** ** ** ** ** ** Windows 64 bits, Intel compiler ** ** ** ** ** ** ** ** Build tag: 0871760_123352017.2_1020_0048655_10 ** ************************************************************************ ** COPYRIGHT (C) 1986-2017 Altair Engineering, Inc. ** ** All Rights Reserved. Copyright notice does not imply publication. ** ** Contains trade secrets of Altair Engineering Inc. ** ** Decompilation or disassembly of this software strictly prohibited. ** ************************************************************************ .. BLOCK FREE FORMAT .. STARTER RUNNING ON 1 THREAD .. CONTROL VARIABLES ERROR ID : 286 ** ERROR IN INPUT CONSISTENCY DESCRIPTION : QUAD ARE NOT COMPATIBLE WITH N2D3D=0 .. UNITS SYSTEM .. FUNCTIONS & TABLES .. MATERIALS .. NODES .. PROPERTIES .. 2D SOLID ELEMENTS .. 3D TRIANGULAR SHELL ELEMENTS .. SUBSETS .. ELEMENT GROUPS .. PART GROUPS .. NODE GROUP .. INITIAL VELOCITIES .. DOMAIN DECOMPOSITION .. ELEMENT GROUPS .. RIGID WALLS .. RIGID BODIES .. ELEMENT BUFFER INITIALIZATION ** ERROR TRAPPED : REPORT TO LISTING FILE ERROR ID : 760 All the components have assigned the card image as part except one which is a rigid wall. Still I'm getting the same error again and again.
  12. Hi, I can't define correctly the surface (Surf_ID) in card /EBCS in a ALE model: Radioss gives me the following errors ERROR IN INPUT DATA or SURFACE IS EMPTY. Hypermesh allows me to select just sets as Surf_ID. How can I define it correctly? Thank you
  13. Hello HyperWork users. I have encountered a problem with Radioss analysis, somewhat connected with my license. Due to lack of separate Radioss programe in SE, we've built engine inside HyperMesh and tried to run analysis. However, each time I run Radioss message below pops up. I've checked ipconfig/all with license already (since I changed Internet provider), as well as re-downloading license file and substituting it. At this point, I honesly strive for any new idea what might be wrog with it. Provided, you need my in- or output files, I may attach them in the next post. Many thanks in advance for your help. EDIT1: I attached files. LICZ_0000.rad LICZ_0001.rad
  14. Hi, The airbag injectors are defined by a function of mass/time so it takes some trial and error to converge on the pressure required. Is there a more direct way to determine the pressure at the end of inflation?
  15. Hi Support I am running crash can crushed by a wall with RADIOSS using Implicit option, but the run stopped simply at cycle 0. I suspect it might have to do with my engine file. could you take a look at the engine file and out file? p/s: I will send the starter file if required, but I can't post it here due to confidentiality Thanks try_Run_0000.out try_Run_0001.out try_Run_0001.rad
  16. Hello, I use Radioss for a dynamic impact problem, but also for the moment to validate my model through a quasi-static analysis. A first component compresses a second component with an imposed velocity. The interface between them is of type 7. In dynamic explicit simulation the interface works fine but in the implicit simulation, I get a warning in interface : "NODE ... DE-ACTIVATED FROM INTERFACE". If I make an "initial penetration" (initial gap < gapmin entered into type 7 interface) I do not get this problem (however I get initial constraints I want to avoid). Would anyone know what the problem might be ? Hereunder a part of my engine.out file: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CYCLE TIME TIME-STEP ELEMENT ERROR I-ENERGY K-ENERGY T K-ENERGY R EXT-WORK MAS.ERR 0 0.000 0.2000E+05 SOLID 39426 0.0% 0.000 0.000 0.000 0.000 0.000 ANIMATION FILE: pression_statique_07A001 WRITTEN ***** WARNING : ELEMENT FORMULATION ISOLID= 0 IS NOT AVAILABLE FOR STIFFNESS MATRIX BUILDING, USING GENERIC ONE INSTEAD POSSIBLE CONVERGING ISSUE. ***** *--------- STIFFNESS MATRIX SETUP ---------* SYMBOLIC DIM : ND = 155532 NZ = 2897175 NB_MAX = 26 FINAL DIM : ND = 47480 NZ = 761383 NB_MAX = 26 --STIFFNESS MATRIX WILL BE REFORMED AFTER EACH 3 ITERATIONS-- * CONVERGED WITH 0 ITERATIONS, |du|/|u|,|r|/|r0|,|dE|/|E|= 0.1000E+01 0.0000E+00 0.1000E+01 WARNING INTERFACE 701 NODE 13703 DE-ACTIVATED FROM INTERFACE WARNING INTERFACE 701 NODE 13548 DE-ACTIVATED FROM INTERFACE WARNING INTERFACE 701 NODE 13693 DE-ACTIVATED FROM INTERFACE ANIMATION FILE: pression_statique_07A002 WRITTEN * IMPLICIT COMPUTATION TERMINATED WITH TOTAL NONLINEAR ITERATIONS: 0 * TOTAL NUM.OF MATRIX FACTORIZATION AND PCG ITERATION: 0 0 RESTART FILES: pression_statique_07_0001_[0001-0001].rst WRITTEN ------------- ** CPU USER TIME ** #PROC [K]SETUP [M]SETUP IMPL.SOLV IMPL.TOTAL 1 .4862E+02 .0000E+00 .0000E+00 .4930E+02 #PROC CONT.SORT CONT. F ELEMENT KIN.COND. INTEGR. I/O TASK0 ASSEMB. RESOL 1 .5591E-01 .6813E-02 .2678E+00 .2133E-01 .4654E-03 .5012E+00 .9117E-03 .1199E-01 .5030E+02 ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Thank you a lot, Kinds regards, Alice
  17. Dear All, if I only have yield strength, ultimate tensile strength, poisson's ratio, and density data, can I get value for a, b & n for Johnson-cook material? Thank you for your help
  18. Hi I'm now working on BirdStrike Analysis using RADIOSS140. Like many paper on birdstrike analysis reports, I've done a reproduction of birdstrike experiment carried out by Wilbeck in 1977 [1]. The resultant pressure PH(*1) and PS(*2) meets with theoretical value very well. Except that,if you look at the pressure curve, there is a "ZERO Pressure" period just after the first contact. Taking closer look into the animation, the SPH bounce back just after the contact. Such blank period doesn't appear in the experiment result,or analysis results of other researchers report. [Question] : Is there a way to correct this ? Model setting is follows. -bird is using SPH. Material law is MLAW6 (Equation of State). -Using contact TYPE7. Istf = 1 StFac = 550 … recommended value by Altair Support Igap = 0 gapmin = h/2 (h = SPH radius) … recommended value by Altair Support I've varied the value of these parameters which didn't make any difference on "ZERO Pressure" period. ******************* *1 … PH: the peek pressure just after the contact(Hugoniot Pressure) *2 … PS: the constant pressure when bird deformation can be seen as constant flow.(Stagnation Point Pressure) [1]:J. Wilbeck,AFML-TR-77-134 1977 161121_Bird Strike experiment reproduction by RADIOSS.pdf
  19. Hi I am trying to simulate a impact condition . Simulation is running but steel sphere is not penetrating the sandwich panel . I am attaching the file here can any one suggest me how to proceed in this . I have used johnson cook plasticity model for aluminium . Cantilever_Impact_NAL_17_16_0000.rad
  20. Hello, I'm trying to convert an I beam composite model after a freesize optimization to radioss to evaluate some failure criterions that doesn't have on optistruct like puck or hashin I'm having the error on the image. Some suggestions ? Thanks !!
  21. Hello, I wanted to know whether the internal energy curve from T file is strain energy or strain energy density? Also, how do I get the contour plot for strain rate experienced by each element?
  22. Is it possible to define the contact ( surface to surface , single surface contact) between components in vibration analysis ( Modal , FRF) in optistruct?
  23. Hello, I am studying the compression of a soft material (hyperelastic) with RADIOSS. But it seems like a hourglass effect happens during the compression (as you can see on the attached screenshots). - I used [Ismstr] =2 and [Isolid] =1 - with /DT/BRICK/CST 0.67 0.0001 - material=LAW42 (Ogden) nu=0.495 (incompressible) I can send you the .RAD files if possible. I am trying full integration [Isolid] =12, but the computation time is really (really) increased even if the result seems better (for the begining of the compression). I also got a poblem as the script in the other screenshot. I do not really know where it comes from... If you can help me please? Thanks, Corentin
  24. Guest

    Hyper-Velocity impact

    Dear George I want to know is it possible in radioss to do hyper velocity Impact , i,e projectile traveling with velocity of 1 t0 10 KM/s (kilometer/second). If you have any literature/case studies or anything kindly share with me . I would also like to know from you whether for high velocity impact Hypercrash is good or radioss
  25. Hi, I am working with radioss solver for adhesive modelling. Material model MAT/LAW83: Alpha: -100 Beta: 1 SN connect Failure model: Fct_0N:4 , Fct_0S:7, Fct_FN:90, Fct_FS:16 Alpha_0 : 50, Alpha_F : 50, Beta_0_F:2 The force vs. displacement graphs when working with KSII-90° and KSII-peel simulation models is showing a significant variation in output. Please find the graph attached, BC -000111 artificially applied to cohesive element nodes. The observed graph with BCs are similar to my experimentation results, does that mean I need to always apply BC 000111 to cohesive elements? Any explanation on why this is happening, could be of great help. Regards, Chaitanya Master's student
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