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FEA Forums » Forum: FEA Forums - Recent Posts http://www.FEA-Forums.com/ FEA Forums » Forum: FEA Forums - Recent Posts en Tue, 07 Feb 2012 22:56:48 +0000 allanwood on "Improvements in Modeling Complex Composite Blades from VABS 3.6" http://www.FEA-Forums.com/topic/411#post-524 Mon, 23 Jan 2012 15:33:29 +0000 allanwood 524@http://www.FEA-Forums.com/ Hello, I hoped to announce the release of VABS 3.6 by AnalySwift for modeling complex composite beam structures, such as wind turbine blades, helicopter rotor blades, high aspect ratio wings, and composite bridges. The main feature of the VABS 3.6 is the improved method of optimizing the finite element mesh. Compared to the previous version, VABS 3.6 is several times faster for large problems, and the slower I/O (Input/Output) performance reported by some users was corrected. Furthermore, VABS 3.6 can handle much larger models, which cannot be analyzed by previous versions. For a realistic blade meshed with 200,000 degrees of freedom (DOFs), using a typical laptop, VABS 3.6 takes less than 20 seconds for constitutive modeling (Timoshenko model), while VABS 3.5 takes about 4 minutes for constitutive modeling. Of course, if one uses DLLs (Dynamic Link Libraries), it will be even faster as a significant portion of time for large problems is spend by I/O with hard drives. Briefly, about VABS: VABS is the only tool capable of rigorously modeling three-dimensional (3D) slender solids with complex buildup structures, such as composite wind turbine blades. The efficient high-fidelity tools offered through AnalySwift enable companies to bring products to market more quickly and at a lower cost with the best available compromise of accuracy, efficiency, and versatility. The unique technology underlying VABS renders it the first truly efficient high-fidelity modeling tool for composite beams, saving users many orders of magnitude in computing time relative to 3D finite element analyses (FEA), without a loss of accuracy. Engineers can confidently design and analyze real structures with complex internal construction due to this unique efficient high-fidelity feature of VABS. For instance, structures as complex as real composite rotor blades with hundreds of layers can be easily handled by a laptop computer. I hope this is of interest. mehtakrunal on "Behaviour of shaft due to twist." http://www.FEA-Forums.com/topic/405#post-518 Tue, 10 Jan 2012 01:58:09 +0000 mehtakrunal 518@http://www.FEA-Forums.com/ In cad model i have applied moment a surface which shows that it will rotate along that axis.Here it does rotate but it does expands radially also.What does it refer in FEA/CAE and how to interprete this results.? patva30 on "How to learn FEA" http://www.FEA-Forums.com/topic/402#post-515 Mon, 02 Jan 2012 01:24:52 +0000 patva30 515@http://www.FEA-Forums.com/ Hello, My self Nikit Patwa. I have done B.Tech in Mechanical engineering and having 5 years of industrial experience. I want to do Masters in Solid Mechanics and my primary interest is to pursue my career in FEA side. I am very much familiar with all CAD softwares and having fundamental knowledge of FEA with Ansys. I am also very good in Strength of Materials subject. Before I get in to masters I want to learn FEA thoroughly as I presume that during studies I can’t spare enough separate time in FEA. I have 1year time from now to do this self study of FEA. I would like your clear guideline how to deal with it. I also want to study complete mathematics behind it. Also one thing always wonders me that why programming of FEA code is required as there are many softwares available in the market with enhanced ELEMENT libraries ready to use. One can use this software for their problem to solve. But still I can see that HYPERMESH software and could be many more softwares are there for meshing and programming at the same time. Please give your valuable guidance in that also. If you know more from my side please let me know. Waiting for your generous response groovytradition on "burraco online" http://www.FEA-Forums.com/topic/400#post-513 Wed, 28 Dec 2011 04:12:44 +0000 groovytradition 513@http://www.FEA-Forums.com/ hi to you, i'm wondering where the perfect site to join in <a href="http://burracogratis.myblog.it/archive/2011/12/27/burracoonline.html">burraco online</a>. i've heard from a buddy that there is a fine place that i be able to join in, are you aware some ? appreciation a lot ! i simply like that amusement, nothing like - <a href="http://burracogratis.myblog.it/archive/2011/12/27/burraco.html">burraco</a>. enjoy your time. groovytradition on "????? ?????" http://www.FEA-Forums.com/topic/399#post-512 Sun, 25 Dec 2011 06:26:39 +0000 groovytradition 512@http://www.FEA-Forums.com/ hello, I reside in Israel and I'm looking for a good somewhere take away birds. I discovered site with serval options and I like someone to translate for me please. thanks in advance <a href="http://doveremoval.blogspot.com/">????? ????? Gogogo on "balloon simulation with ansys" http://www.FEA-Forums.com/topic/346#post-498 Wed, 14 Dec 2011 16:42:19 +0000 Gogogo 498@http://www.FEA-Forums.com/ Hi iii, I'm working on a similar problem, but at nowhere near 10x inflation. What flavour ansys are you using (APDL ("classic") or Workbench) and what dype of simulation are you doing (static/dynamic/modal)? This information might help readers help you with your issue. I'm currently looking for a way to output the volume change inside a pressure vessel as the pressure is increased, using Workbench and running a static structural simulation. How are you calculating the volume change in your model? jyothibasu1k on "Ansys software" http://www.FEA-Forums.com/topic/388#post-496 Fri, 04 Nov 2011 00:56:30 +0000 jyothibasu1k 496@http://www.FEA-Forums.com/ hi dude's do any have Ansys 5.7 or 6 or 7 or 8 version or any other versions between " 5.7 to 8 " i will be thankful to them fullback14 on "the iterative solver doesn't converge" http://www.FEA-Forums.com/topic/387#post-495 Thu, 03 Nov 2011 13:04:15 +0000 fullback14 495@http://www.FEA-Forums.com/ Hi everybody I ran a static analisys of a simple L-shaped thin beam, using the default iterative solver, but i encounterred an error, the problem is ill-conditioned. I've tried a direct solver and i achieved a perfect match between theoretical and simulated calculations. After i've tried a more complex geometry (thin plate supported by 4 L-shaped beam with a free tetrahedrical mesh about 2000 elements)the load is perpendicular to the structure. But unluckly neither the iterative nor the direct solver works; after few hours of runnig the progress bar doesn't advance. Someone can give some usefull and praticall tips? comsol version 4.0a system information: -intel i7 Q 720 @1.6 Ghz; -4Gb ram DDR3 -Win 7 64bit thanks joslopher on "Modal Analysis - Constrained or Unconstrained" http://www.FEA-Forums.com/topic/377#post-485 Wed, 19 Oct 2011 03:45:53 +0000 joslopher 485@http://www.FEA-Forums.com/ Hi, I have to perform a modal analysis of a (box-like) structure. The links to the ground are just four wheels at each corner of the bottom surface. So, have I to perform a constrained or an unconstrained modal anaylsis? Indeed, the structure is not bounded to the ground... Thank you very much! jaiii on "Winding Tools" http://www.FEA-Forums.com/topic/375#post-483 Wed, 12 Oct 2011 02:09:35 +0000 jaiii 483@http://www.FEA-Forums.com/ Hello. I tried installing about 5 Ansys 13 st8le in DM but I do Winding Tools. Can you tell me why? Or where do I look for? Thank you paul031 on "modeling compression only springs in Ansys beam element model" http://www.FEA-Forums.com/topic/356#post-482 Tue, 11 Oct 2011 01:09:46 +0000 paul031 482@http://www.FEA-Forums.com/ There is one thing every <a href="http://www.premierfootballshop.com/">Packers Jersey</a> fan should pay attention to that wearing an authentic <a href="http://www.premierfootballshop.com/">Steelers Jersey</a> shows a deeper level of support for your team. For a portion of the proceeds from the sale of the <a href="http://www.premierfootballshop.com/">Cowboys Jersey</a> goes to the team and to the <a href="http://www.premierfootballshop.com/">Bears Jersey</a> themselves so that they are able to pay for good coaches, hunt for new talent, and employ great looking cheerleaders among other things, which will please the crowd. Ziggi on "FEA meshing - why not 2d mesh -> 3d mesh ???" http://www.FEA-Forums.com/topic/368#post-475 Wed, 28 Sep 2011 16:48:36 +0000 Ziggi 475@http://www.FEA-Forums.com/ Well, I have just realized why the people do not use FEA (finite elements analysis) as often as they should do: FEA preprocessing phase is a disaster!!! Simply speaking - there is no simple, efficient meshing software available on the market. Existing software like Hyper Mesh is just an interface catastrophe. Everything you hate in a computer software interface is existent there! OK - being serious. The problem seems to start at the beginning. Engineering design applications are NURBS driven. They describe surface in a topology unaware manner. Then the project goes into FEA preprocessor where appropriate mesh topology is being created for further analysis. Well - while contemporary FEA preprocessors are powerful in terms of handling various mesh types, they are extremely poor modelling tools compared to professional modelling tools like 3DS Max or Maya. Simply speaking - any 3D artists is able to deliver a model with nice surface mesh topology: definitely this model will be better than result of automatic meshing by FEA preprocessors or even better than human-optimized meshes delivered by inexperienced FEM engineer! The only problem is... how to proceed from surface (2d) mesh to volume (3d) mesh keeping surface topology of the input geometry? Or rather - the real issue is that I have never heard about a FEA preprocessor accepting surface mesh data as input geometry. Why??? Aren't there efficient algorithms generating volumetric 3d mesh from 2d surface mesh (volume tessellation)? Sure thay exist but FEA preprocessrs do not implement these algorythms. Why??? Would you be so kind to explain why streamline like below is non-existent in practice?: 1) 2D surface mesh geometry to be constructed in 3DS Max or similar application as triangular, tetra- or even hexa-mesh (with special modelling techniques hexa- is also is possible). Basic topology optimization is achieved already during modelling phase! 3D artist can easily recreate complete mesh geometry based on data imported from industrial design application. Dimension are not recreated perfectly but sure they are recreated in a near perfect manner. 3D artist doing in Max or Maya can easily skip unnecessary features and he/she can construct mesh of various density following appropriate specification. 2) Conversion of the surface mesh model into volume mesh model preserving imported surface mesh topology. A special subroutine is necessary for this within a FEA preprocessor. 3) Generated 3D volumetric mesh is used within FEA preprocessor as usual: materials, loads, constraints are applied. 4) Final result being sent to appropriate FEA solver. The reason for the question is simple: an hour of a 3D generalist (a 3D modeler) work is by far much cheaper than an hour of FEA engineer while 60% of FEA engineer workload is... meshing !!! Would you be so pleased, to comment??? Trin on "Open CAD file in ANSYS classic or Workbench" http://www.FEA-Forums.com/topic/362#post-469 Thu, 22 Sep 2011 05:35:40 +0000 Trin 469@http://www.FEA-Forums.com/ Hi everyone, I am a newbie in ANSYS and i have a beginner problem of opening a CAD file in ANSYS. my CAD file has the .STL format which i couldnt open, i tried to convert it to .SAT or .IGES but still didnt work. Is there any especial way of converting or shall i do some modification somewhere in order to repoen the file in ANSYS. Would be nice if anyone can help me in this topic abdoganawa on "fatigue calculation" http://www.FEA-Forums.com/topic/360#post-467 Wed, 21 Sep 2011 23:23:49 +0000 abdoganawa 467@http://www.FEA-Forums.com/ dear all, I performed fatigue analysis for 2205 duplex stainless steel pipe but I noticed from the result allowable cycles that supposed to be calculated by ansys is constant(1e8) in the different locations. and the alternating stress value is too small. so what the source of error that I made?. to explain further I presumed that pipe exposed to two events each one of them include two loads. any advice is highly appreciated thanks in advance ayothicfd on "Methodology to simulate the performance characteristics of radial backward fan" http://www.FEA-Forums.com/topic/358#post-465 Tue, 20 Sep 2011 08:18:12 +0000 ayothicfd 465@http://www.FEA-Forums.com/ Dear all, I have carried on the project regarding the performance analysis of radial backward fan. Blades have to be given as a rotating one and remaining domain is stationary. I need to know what are all the boundary conditions to give.. It is easy to do this job if i know the exact methodology of corresponding analysis. zohreh_mm2004 on "max stress transient analysis" http://www.FEA-Forums.com/topic/357#post-464 Tue, 20 Sep 2011 07:03:04 +0000 zohreh_mm2004 464@http://www.FEA-Forums.com/ Hi I have done a transient analysis in ANSYS and I want to know max stress over time of the analysis. how can i do this? ANSYS can find any node stress over time but I don't know it about max stress. dazhoid on "modeling compression only springs in Ansys beam element model" http://www.FEA-Forums.com/topic/356#post-463 Tue, 20 Sep 2011 01:20:46 +0000 dazhoid 463@http://www.FEA-Forums.com/ Hi I just look for the easiest way to create a compression only spring (acting only under pressure) within a multibody beam element model. Is it with combi39 for instance ? if so, what parameters should I use ? Thanks for your help. sasan on "ANSYS 13 Elements" http://www.FEA-Forums.com/topic/355#post-462 Thu, 15 Sep 2011 11:29:50 +0000 sasan 462@http://www.FEA-Forums.com/ Hi everyone I am a new user of ANSYS. I have found some tutorials. They are written for ANSYS 7. But I have installed ANSYS 13. In some examples of tutorials, the suggested element does not exist in the element types of my software. An example is the element called "Beam 2D elastic 3". Where can I use and find these elements which apparently do not exist? Thanks a lot chagri on "Convergence Criterion Problem in RC beam for NON LINEAR analysis" http://www.FEA-Forums.com/topic/354#post-461 Wed, 14 Sep 2011 06:34:52 +0000 chagri 461@http://www.FEA-Forums.com/ The designing seems to be correct as I have modeled the prototypes earlier. And this beam is getting converged till 50KN load, after this it is not getting converged. I have even given the L2 norm and did some hit & trial with the Reference & tolerance limits in Solution & controls for Convergence Criterion Analysis data feed. I have even increased the no. of sub-steps in the Load step, still not working, Can any1 suggest me some more alternatives to get this converged. sunkan on "Ansys thermal analysis of steel plate" http://www.FEA-Forums.com/topic/350#post-456 Sat, 03 Sep 2011 12:01:55 +0000 sunkan 456@http://www.FEA-Forums.com/ I want to study steel plate behaviour under different temperature using Ansys. As I m new to ansys, need some help to proceed. Any reference link or guide?. iii on "balloon simulation with ansys" http://www.FEA-Forums.com/topic/346#post-452 Wed, 10 Aug 2011 05:30:17 +0000 iii 452@http://www.FEA-Forums.com/ hello I am interesting in balloon inflation. I tried to to a simulation by appling pressure on hollow dome thst was made from rubber (hyperelastic material). the problem is that this simulation was able to converg for low pressures with low volume(balloon can iflate 10 times from its original size). How can I make it possible for the simulation to inflate in grater scales? Thatnks, Andrewspotlight on "modeling a moving 3D magnet!" http://www.FEA-Forums.com/topic/339#post-445 Thu, 14 Jul 2011 18:30:41 +0000 Andrewspotlight 445@http://www.FEA-Forums.com/ Hi everyone, I am modeling a 3D magnet and a solenoid. The magnet is moving at a speed (constant or not), and it is moving towards to the solenoid, which is static (fixed to the ground). I want to model the emf and induced current on the solenoid, due to the change of magnetic flux density coming from the magnet. So far, I have written ANSYS program, but keep getting warning like "Real constant set 1 undefined but referenced by element 1..", I have searched as many ways as I can to fix this error, but couldn't solved the problem at all. Can anybody give me some suggestion please? Thanks so much!!!! !************************************************************** /TITLE,3D single magnet static analysis /PREP7 EMUNITS,MKS !************* DIMENSIONS ****************** pi = 3.1415 mx = 0.01 my = 0.01 mz = 0.01 ! dimensions of magnet cr1 = 0.02 cr2 = 0.019 ch = 0.02 ! dimensions of coil d = 0.01 ! distance between coil and magnet l = 0.02 ! air gap ax = cr2+l ay = cr2+l az = 2*mz+d+ch+l ! dimensions of air care =0.0005*0.0005 ! cross section of coil n =50 ! turns of coil cv = pi*(cr2-cr1)*ch ! volume of coil rcoil = 0.1 ! resistance of coil d_dmn=0.025 ! depth of surrounding domain R = 100 ! resistor connected to coil frqncy=100 xveloc=0 yveloc=0 zveloc=-0.5 ! velocity !************ GEOMETRIES ***************** vsel,none block,-mx,mx,-my,my,-mz,mz ! magnet volume vatt,1,,1 ! assign magnet with mat#1 and typ#1 vsel,none cylind,cr1,cr2,mz+d,mz+d+ch ! coil vatt,2,,2 ! assign magnet with mat#2 and typ#2 allsel cm,magcoi_v,volu vsel,none block,-ax,ax,-ay,ay,-az,az cm,space_v,volu cmse,all vsbv,space_v,magcoi_v,,dele,keep ! air volume (space minus magcoi) cmse,u,magcoi_v vatt,3,,3 ! assign air with mat#3 and typ#3 alls vplo !************* ELEMENTS & MATERIALS ******************* et,1,solid97 ! air (ele #1) keyopt,1,1,0 ! AZ dof keyopt,1,2,0 ! no velocity effects mp,murx,1,1 ! air (mat #1) et,2,solid97 ! magnet (ele #2) keyopt,1,1,1 ! AZ dof, volt dof keyopt,1,2,1 ! velocity effects mp,murx,2,1.09 ! magnet (mat #2) mp,MGzz,2,8*1e5 r,2,,,,,,, rmore,,,xveloc,yveloc,zveloc et,3,solid97 ! coil (ele #3) keyopt,2,1,3 ! 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Esbjerg on "Supercomputer for Ansys" http://www.FEA-Forums.com/topic/332#post-438 Wed, 06 Jul 2011 02:36:36 +0000 Esbjerg 438@http://www.FEA-Forums.com/ Hey guys. We are looking for a sort of supercomputer only for Ansys simulations. We need to save time on each analysis. Do you have suggestions for where to look, or what to look after to get this "supercomputer" for FEA analysis. The max amount for the computer is 10.000 $. ussrian on "Nonlinear Dynamic Biphasic FEA" http://www.FEA-Forums.com/topic/330#post-433 Fri, 01 Jul 2011 09:55:20 +0000 ussrian 433@http://www.FEA-Forums.com/ Hello, I am looking for any nonlinear FEA software available that can analyze dynamic (oscillatory) movement of a biphasic (porous solid saturated with liquid) tissue. We are trying to get a dynamic model of vocal fold vibration. So far I have looked at Abaqus and FEBio, and neither seem to have that. Would anyone know of software that might be able to do that? Thank You