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Found 424 results

  1. 材料則2(Johnson-Cook則)は鋼材やアルミ等の金属材料の材料則として、良く用いられるものですが、そのパラメータは以下のようにして求めることが出来ます。 まず、引張り試験の実測の応力-ひずみ曲線から真応力-真ひずみ(対数ひずみ)の関係に変換し、更に真ひずみからσ/Eで弾性成分を差し引いて、縦軸真応力、横軸真塑性ひずみのグラフが得られているものとします。Johnson-Cookの式はひずみ速度依存と温度依存を除くと、 σ=a + b εpn の指数関数で降伏後の硬化曲線を近似しますが、この式は、 σ- a = b εpn の形にした後で、両辺の対数をとれば、 log(σ- a) = log(b εpn) = log(b) + n log(εp) と直線になります。これらのパラメータのうちaは降伏応力ですのでεpが0のときのσの値で、後はbとnを決めれば良い事になりますが、対数の形にした後は直線ですので、最小2乗法を用いれば、実測σ-εpの関係からフィッティングを行うことが出来ます。 実測のカーブからのデータ処理の詳細は、Radiossユーザーズ/リファレンスガイドの例題11-引張り試験をご覧ください。
  2. Hello everyone, For the first time we are working with series of radioss files. At a given time of the calculation , for example at t=10s, we would like to continue the calculation by deleting a component. The reason is that this componenet is RDX gaz and is causing problems at the interfaces at a time he is no longer important in our model. In the HELP documentation we found that it was possible to delete a defined set or list of elements, but we are trying to delete an entire component, If any one could help us please ! In the new file of calculation _002.rad we want to use /DEL/????? for example like /DEL/Component
  3. What is the meaning and significance of Plastic strain (s) and von Mises (t) strain? What is the difference between the two?
  4. Hello All, I'm doing fitment analysis of shaft and hub with an interference of 110 microns and want to analyse 1.deformation in each component. 2.pressing force required for fitment. 3.Interference pressure. can anyone tell me which control card should i use for the above output requests? Regards, Ganesh M
  5. Guest

    Error in input format

    hey every one , so i have a probeleme here with hypercrash(radioss) , the message error is as follow : ERROR ID : 55 ** ERROR IN INPUT FORMAT DESCRIPTION : -- OPTION : GRNOD -- BLOCK : /GRNOD/BOX/34 -- LINE : /GRNOD/BOX/68 can i get your help please !! thanks
  6. Hello everyone, What's the meaning of message which showed in solver view window (As I know, the same message is also written to _0001.out file). The figure below shows an example of the output message. What's the meaning of every column parameter, especially the ERROR parameter? What's more, the ERROR becomes 99.9% implying what? Best Wishes. Roy
  7. Happy Monday, Dear all, If we have "part" and then we would like to know, how strong it is (let say, I would like to know, in load .... Newton it would be broken). Is it possible? whether in radioss or optistruct. If you have a tutorial or ever do the project like what I mean above please share "the know how". Thank you. Regards, Iron_Man
  8. Hi, I have started applying AMS in RADIOSS v14.0 .Initially the simulation is running and after some time. Later an error is sprouting .Pl see the below error message. ** ERROR : AMS IS LIKELY DIVERGING: TOTAL C.G. ITERATION NUMBER = 1000 AT CYCLE NUMBER 1239 Can you suggest a possible soultion to curb this? The values recorded in .OUT file are normal. in the sense there is no abnormalities in %energy error or mass error%. I do not know where the problem is, please help me look at it? Thanks for your support in advance. wancheng3.hf 1_0000.out 1_0001.out
  9. Hi all, I want to run a Radioss analysis of a layered structure under impact. As my layers are too thin to be modeled with 3D elements, I want to use midsurfacing tool. Relative to that, I have 2 questions: 1. One thing I ask myself since the beginning of using midsurface is : should I translate the components relatively to the new midsurface ? ie. if a ball impacts a table, should I translate the midsurface of the table up, to make contact at the right time ? I would say you do not have to translate it as you indicate the thickness, but in my simulations, contact does not begin (vonMises stress = 0 ) before I can visually detect it. So I always translate my components, though it seems weird to me... 2. As I said, I want to model a structure comprised of different sheets of materials, which I would like to model as 2D elements. Problem : - At first, my 3D components are in contact (if it had been a 3D mesh, I would have liked to have a continuous mesh) - When I do the midsurface for each sheet, they have a gap; which is normal but which I wonder about : I suppose I should not translate my midsurfaces, however contact is not detected and I would like to use continuous meshing instead of interface option. Hope that was clear enough. If you can give me some answers to my questions, it would be very helpful. Thank you in advance, Alice
  10. Hello, I know that Radioss is a solver which has both Implicit and Explicit solving scheme. I want to know when I solve a problem in Radioss which scheme is being used. Is there any way to select the method i.e. implicit or explicit when solving a problem? Thanks, Datta
  11. Hello, Can anyone tell me what card to use to compute strain energy? My model has 2D mesh. Thanks, Datta
  12. Hi, In explicit dynamic run using Radioss, i am trying to output energy plot . I have defined TH/PART in a deck file. Whenever i am trying to load *.T01 file into Hypergraph, its showing following error - (refer attached image) Please help in this problem.
  13. Hi, I'm new to radioss. I'm carrying out roll over analysis on box as shown in attached image. i've assigned initial velocity along axis and got the box roatating, the problem i'm facing here is the box is being thrown upward and its not falling on the base.do i need to assign gravity? if so how?
  14. Hi there, I am trying SPH INOUT Collector for simulating water flow at a certain speed in a tank and a pole at middle of the tank. My aim is to capture the vortex formation around the pole. But first of all I'am unable to define properly the INOUT condition (SPH is moving away from the inlet boundary). A set of SHP Particles moving and collides with other (as shown below) At outlet I defined atm. pressure function. I am attaching the deck with the simulation HV video to represent my problem. Kindly request to consider my problem and suggest some solution for it. Thanking You. rgrds, Pritam Inout_0000.rad Inout_0001.rad
  15. Radioss explicit analysis process completed successfully, 0 errors, 0 warnings but animation file not generating. Some window of HV Trans is opening and nothing can be done except closing it.
  16. Hi, I need to carry out frequency response analysis with operating speed. There is no force and I have only speed in rpm as input. How to specify this in Optistruct instead of using SPCD/DAREA card?
  17. Hello everybody, I am conducting a spring design analysis using Hyperworks (Hypermesh, Radioss, Hyperstudy, Hyperview). For the moment, I already have a database of previous analysis done by previous researchers. After I ran one simulation using the same input parameters as the previous study, I noticed that I obtained a slightly different results. So my question is, is it possible to have a different result despite having the same input parameters? Is there any result consistency with regard to the Radioss solver? What could possibly go wrong? BR, Hanif
  18. I came across in the documentation that the life is calculated using the formula. Sr = SRI1(Nf)b But, even after maintaining the co-efficients, TRTMENT, FINISH and [KF] as 1, the results are off (when compared with the manual calculation using the above mentioned formula) by a random factor (approximately 0.5), for each unique component I take for fatigue analysis (Refer image attached). Why is it so? What is the calculation happening at the back end of the software? Why is the factor 0.5 coming into play?
  19. Dear all, I've done with tutorial RD-3500 about tensile test & the result shows that the part is broken. And then I try to make 3D model of it problem and I use MAT23 & P14_Solid to the simulation. The problem is, when I open the result in hyperview, my 3D model is not broken at ALL (see the attachment). What's wrong with my model? Please help me. Thank you Best regards, Iron_Man Note : If you need the .HM file, please message me.
  20. Hi, How to calculate the no of elements after the simulation on hyperview. I want to know in my simulation if any element has been deleted.
  21. Hi, Is there non linear adaptive meshing in hypermesh, like in ANSYS? For instance if the model goes through impact is it possible that the software re meshes the region with a finer mesh to accommodate new geometry?
  22. Hello all , I have created a laminate with around 28 plys and now I want to reflect the laminate and also the plys, what is the best way to do it? Thanks
  23. Hi, can someone share the model files of RD-E: 5400 Cut Methodology from Radioss example guide? The files were supposed to be in the following folder, however no such folder in my installation directory.
  24. 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。
  25. アワグラスモードの制御の為に人為的な抵抗係数を導入するのでは無く、仮想のひずみ場を導入してこれを有限要素法のエネルギー式に取り入れることにより、アワグラスモードの発生を抑える、という手法が90年代に入って生まれてきました。物理安定化(Physical Stabilization)と呼ばれるこの手法では、古典的なアワグラスコントロール(摂動型アワグラスコントロールとも呼ばれます)と異なり、アワグラス制御のために人為的な係数の導入を必要としません。文献にあります様に、元々は等方性弾性の4節点シェル要素に対して導入されましたが(QPH要素と呼ばれます)、これを弾塑性に拡張したのがRadiossのQEPH要素(4節点シェル要素)とHEPH要素(8節点ソリッド要素)です。これらの要素はそれぞれプロパティでIshell=24 、Isolid=24を指定する事で選択できます。古典的な1点積分要素に比べ、15%程度のCPU時間の増加で効率的にアワグラスの問題を避ける事が出来ます。これらの要素は当初は等方性材料のみに適用可能でしたが、現在では異方性材料にも適用できるように拡張されています。 文献:Ted Belytschko and Itai Leviathan, Physical stabilization of 4-node shell element with one point quadrature, Comput. Methods Appl. Mech. Engrg. 113, 1994, 321-350.
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