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Found 393 results

  1. Hi, I`m writing my master thesis and I need an help with tutorial HS 4200. I`ve done all the tutorial and I`ve found the parameters shown in the pdf. I`d like to print a comparison plot experimental data vs fitted curve, but I can`t do it. I tried to recover strain and stress in hyperview, but they are different from the experimental stress/strain. Please help me!
  2. Dear All, I am simulating the contact behaviour of gear with Radioss. I had given time step equal to 0.1 sec is it sufficient for this type of problem?? My stress level is exceeding my yield limit, also Its taking too much time to simulate the analysis may i get any tip to reduce my cycle time and suggestion on cycle time. Please refer attached file for same. I applied 80 Nm moment alongcentral axis and fixed the gear to simulate stress due to initial torque. Symmetric_model.hm
  3. Hello, I am currently doing a drop test and the design is failing way bad than the actual object. I think this is because in actual drop test, the concrete ground absorbs certain energy. In the simulation I used RWALL which won't absorb any energy. So is there any other wall that absorbs energy?
  4. Would some one help please I want to make this geometry mappable
  5. Hi, I am trying to convert Abaqus to Radioss block format. When doing so, I am facing an error ("Error: 0"). I have attached the images with this post. I have checked the ABAQUS input file and could find no error in it. Is this happening due to any other issue? Thanks in advance for your help. Regards.
  6. Hello, I am trying to make an analysis in radioss, where a small composite uav is caught in a barrier net. After searching for something similar to what I am trying to do, I found the document attached below but,but, as I am new to this Hyperworks module, I don't know where to start. Can someone help? Thanks. Hawk T Mk2 - Arrestor Barrier (BAN MK2) Engagement Analysis.pdf
  7. Hi everyone I'm performing crash analysis with radioss using units [ms], [mm], [kg], [kN]. I' ve added an accelerometer on the vehicle and I was trying to understand in what kind of units is the output of the acceletometer itself, because I get different values from the acceleration I get as double derivative of the displacement of the same point. Thanks for the help
  8. Hello everyone! Why am I not able to see new engine keywords introduced in RADIOSS 140 For Eg, /ANIM/BRICK/TDEL, etc. ? Secondly, How do i see the output of user defined law in /ANIM/BRICK/ ? As per the manual I should be able to select USRi - Variable of user law (i =1 to 18) but unfortunately its not visible in my /ANIM/BRICK/ output card. Can someone please guide me through this ? Thank you very much. Regards Avi
  9. I have received this error message. I read that I have to do the following settings for proprty of plastic I have activated the ENG/DT/BRICK CST as well and set Tscale and T min as follwing (are the valuses for Tscale and T min correct?) but I still get the same error. Would you please check my attached model and see what is wrong? Thanks a lot in advance type7_4.hm Quote Edit Prakash Pagadala Advanced Member Administrators 106 2034 posts Country India Are you University user?:No Posted 10 hours ago · Report post Hi, Please refer to the following posts: Thanks for your reply Prakash. I am using Radioss block 120 and I am using Hexa elements. So I read the posts you have refered before but they didn't help me. I have used M36 Plas TAB plastic and I have used P14 SOLID as card image. What should be the values for ISOLID ? Ismstr ? Icpre ? I have activated DT/Brick/CST in control card what shoulbe the values for Tscale and Tmin is it ok to use hexa elements here or do I have to switch to tetra. (As I read before tetra elements are stiffer than hexa. Does it help to switch to tetra?) Thanks for your help
  10. Hi there, i ran an composite optimization in Optistruct and now i want to analyse if the Geometry fails in RADIOSS because the Failure Criterion (PUCK) isn't available in optistruct. Anybody knows how to do that?
  11. Hi everyone, I want to use nonlinear material for my drop test. i have stress - strain curve. i want to know how can this be brought into Radioss ? also I want to have plastic strain among the results , i cannot find strain variable on anim tab . please let me how can i have plastic strain as result.
  12. I'm running a crash simulation in Radioss and I have requested a T file to be written. When I try and load the T file (T01) in hyperview and in hypergraph an error comes up saying it was unable to recognise it. I set the type to 0 default and I also tried 4 because I believe hypergraph can read that. I think data is being written to the file because the file size is fairly large. Any help would be appreciated. _ront_bumper.crashT01
  13. Hi everyone, could someone help me with composites simulation? I'd like to understand the difference between material law 25 and 58 to make the better choice for my simulation: in attach the data sheet of the material. If someone have theoretical and pratical (tutorial) material could shear it? Many thanks in advance Marta Tepex_Dynalite __102RG600__PA.pdf
  14. 陽解法では、これ以上Δtを大きく出来ない、という安定条件が存在し、これがCourantの安定条件と呼ばれる以下の式:  ここにlcは要素の代表長さ、cは弾性波速度、、E:ヤング率、ρ:密度 で近似できる事は、時間積分の安定性について(1)、(2)で示した通りです。安定限界は、要素の安定限界は節点の質量と剛性でも与える事が可能で、この場合、 、ここに、m:節点質量、k:節点剛性 となります。安定限界はモデル全体での最小の時間ステップΔtで決まり、モデル中に少しだけでも小さな時間ステップの部分があると、そのために計算時間が大きく伸びてしまいます。もし、その時間ステップを決めている節点に多少の質量を追加する事が出来れば、その分安定限界を大きく出来ますので、計算時間の節約になります。これがマススケーリングと呼ばれるものです。 マススケーリングはEngineファイル(0001.rad)の中で /DT/NODA/CST ΔTsca ΔTmin というカードで指定できます。ここに、ΔTscaは安定限界に対する時間ステップのスケールファクターで、デフォルトは0.9です。これは安定限界の0.9の時間ステップで計算する事を示しています。係数を小さくするほど計算自体は余裕代が増えますので計算は安定しやすくなりますが、計算時間は増えます。一般に非線形性の高い問題を扱う場合には0.67位まで小さくした方が安全です。ΔTminがマススケーリングで目標とする最小時間ステップです。大きくすれば計算時間は減りますが、その分、節点に追加される質量も増えることになり、解くべき問題を変えてしまう事になります。どの程度質量が増加したかは、Engineの出力ファイル(0001.out)のMASS ERR.に出力されます。一般には2%( MASS ERR.が0.02)位までであれば、結果に対してそれ程影響を与えないと言われています。モデルにも依存しますが、この程度までの質量増加でも時間ステップを数倍大きくする事が可能になる事がしばしばです。ΔTminの大きさに関しては、Engineを少しだけ実行するなどして、MASS ERR.の値を確認し、決めます。 モデルの要素や節点の最小時間ステップは、Starterの出力ファイル(0000.out)にも出力されますので、これを確認してメッシュの修正が可能であれば予め修正して時間ステップが大きくなるようにすべき事は当然ですが、複雑なモデルですべての修正は困難な事が多いため、こうしたマススケーリングが実際には多く併用されます。
  15. Hello, I want to simulate when load which is beyond the load which can glass take. glass will shatter. please suggest me any tutorial. Thanks in advance
  16. Mrt

    contact

    Hello all! What is the best way for contact interaction with small penetration? But reaally, i don't see penetration penetration checker doesn't see this too. but in post processor i have the spurious forces. i have a manual-crash book. i have tried to use approaches from this book, but i have had fail. if i do type 7 all settings default i will no contact interaction untill i have large displacement. i need advice and approach!=) thanks for help. 1.avi 1_0000.rad 1_0001.rad
  17. Hello, I am trying to perform impact analysis and my model contains a compression spring which works under axial loading. Which model should I choose? Will P4_SPRING be OK? Does K parameter refer to spring stiffness? Could anybody shed some light on the matter? Thanks in advance.
  18. Hi, I am running impact analysis in radioss and need to know the strain energy of few component. Please let me know how to request for strain energy by parts in control card/Engine keyword (Radioss Interface) Thanks Ramesh
  19. I wish to do an impact analysis of the CRPF tube, I was just not able to understand how to do it in RADIOSS. I have used Hypermesh - Optistruct and I know about properties like PCOMP, PCOMPP. But I'm not sure what model setup should I use in RADIOSS. IMPACT_ANALYSIS_OF_CRPF_tube.pdf
  20. Hi all, I am trying to simulate the impact on a impact attenuator to be used in FSAE competition. I have referred the steps followed in the video by Altair,on YouTube,regarding the same.How ever i am facing the error during the solving time,it shows the following error,in RADIOSS Solver ERROR ==> NO RESTART FILE ERROR ID : 88 ** ERROR : TIED INTERFACE WARNING ID : 312 Could you please help me with this issue? I have attached the .out file AND .rad file also. Thank you. Run_3_0000.out
  21. Dear All, How to assign all number cores to run simulation. Will Number of cores affect simulation time? I doubled the RAM (previous 8GB, Now 16GB) , but there is no change in simulation time.
  22. Dear, All, I have finished with meshing, material assignment and contact definition in Radioss. want to predict, push-in and pull off force required to insert and remove male part in/from female part. Can anyone please revert with the procedure for the same.
  23. Dear All, I want to calculate press in force required to push the bearing outer ring into the housing using pressing dolly. I have defined contact between pressing dolly and outer ring; outer ring and housing. Is that pressing force is contact force between pressing dolly and outer ring ?? Need your opinion for the same. (I’m using Radioss for this analysis) Also, Is it possible to do above analysis at -30 degrees surrounding temperature? Please revert with the above queries.
  24. Dear All, how to apply rotational velocity to any component and if possible please revert with loading conditions necessary for below analysis.
  25. 板物の接触であれば、板厚相当のギャップを与える事で、Type7インターフェースでほぼ全ての問題をカバーできますが、ソリッド同士の接触の場合、Type7インターフェースではギャップ相当の初期隙間を常に与える必要があり、密着しているソリッドのモデル化には不便です。そこで、ギャップ0が可能なソリッド用の接触インターフェースとして開発されたのがType24です。このインターフェースではソリッドに対しては0ギャップがデフォルトで、シェルに対しては板厚相当のギャップが考慮されます。ペナルティ法に基いた接触インターフェースですが、ペナルティ剛性は一定で、接触によるΔTの低下はおきません。 接触の定義にはサーフェス1、サーフェス2、節点グループを用いることができ、 サーフェス1+サーフェス2:サーフェス対サーフェス接触 サーフェス2+節点グループ:サーフェス対節点接触 サーフェス1のみ:シングルサーフェス接触 を定義できます。オプションInacti=-1とすることで圧入の問題に対応することも可能です。 Radioss 2017.2からは、新しいオプションIedgeが追加され、Iedge=1とすることで、エッジ接触にも対応できるようになりました。このオプションを用いると、ソリッドではEdge Angle(デフォルト135度)以下の要素の辺がエッジとして認識され、Type11同様、エッジ同士の接触が取り扱われます。なお、このオプションはHyperMesh2017.2の段階ではまだ対応できていないため、現状、設定には入力データのテキスト編集が必要です。
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