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Found 111 results

  1. For Modal and Stiffness(torsional and bending) of ladder frame chassis, is there any significant difference in results when I use stick contact between frame and cross-members or when I use shell/rigid weld elements to connect cross-members and long members?
  2. Dear Sir, I want to do a three point bending test of carbon fiber laminate in Hypermesh with Radioss. I found something puzzle when i create the contact between components after i had defined materials, properties (CFK using M25_COMPSH and property with it using P17_STACK), plies, laminate and some of boundary conditions. I chose TYPE 7 as the card image to let laminate be a slave entity and impactor be a mater entity but i found i cannot select my laminate component in the option(i can only see other component) Is there any mistake in my operation? Here are some pics under. I am exactly green hand in radioss, my apology... and I hope someone can help me on this.
  3. Dear All, Could you help me to verify, is my simulation valid or not? I do not know because this is first time I use contact in hyperworks my material is steel, with mechanical properties : 1. E = 205000 MPa 2. Poisson Ratio = 0.29 3. Density = 7.85E-6 kg/mm3 4. Yield Strength = 490 MPa 5. UTS = 686 MPa The .hm files is in attachment. Thanks and Best regards, Iron_Man Contact_001.hm
  4. 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
  5. I updated to Hyperworks Desktop 14.0.130 and the Contact Tool is not available in the "Tools" dropdown. It used to be grouped with the Pretension Manager and now it is missing. Where did it go?
  6. Hello, I'm trying to run a 3 point bend test. The supports doesn't matter, if possible i would like to make it rigid, but to avoid stress concentration in a point i need to model this contact between the support and the I beam. How can i do this, or find some tutorial more focused ? Thanks !
  7. I am trying to simulate a quasi-static (NLSTAT) contact problem using Optistruct. I apply a constant displacement on a rigid cylinder which is set apart from a deformable body. The deformable body starts to deform from the beginning of the simulation without contact. As soon as there is contact, the simulation stops without an error message before the prescribed displacement is achieved. What possibly am I doing wrong? Can I use a composite (PCOMPP) as the deformable body in this case? I don`t remember exactly the message but I received an error saying that I could not use it. Also, as i understand from the manual, SLIDE is used for small sliding condition. What should I use if I have finite sliding? Thanks
  8. Can any one Guide me for, Tutorial or Steps for: set up different type of contact condition between two solid and run in optistruct. (fix condition between surface pairs) post processing contact analysis result in Hyperview.
  9. Hi, I am working on a laminate optimization. I'd like to do the three phases: Free Size Optimization, Size Optimization and Shuffle Optimization mentioned in the composite manual. My question is how can I connect the element faces in the 3rd direction with other elements of different components. In the attached picture I would like to connect the yellow part with the different laminate layers. Are there any solutions available, I could not find equal problems in the composite manual. thank you in advance, Martin
  10. Hi Guys, I have been trying to analyze (static linear) the effect of pressure on an assembly of 2 disks. They are of different materials. The bottom surface of the bottom disk is fixed and pressure is applied on the whole top surface of the top disk. I have tried using freeze contact and also tie but I am only getting stresses on the top disk in the results in both cases. The deformation seems weird because the top disk deforms through the inside of the bottom disk and I get an ice-cream cone like shape. ( I did refer to RD-2100 tutorial for solids in contact) I would really appreciate any help with this. I am a new HW user. Thanks!
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