# vij

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1. ## How to create a revolute joint using RBE2 elements

Hi Prakash, My objective is to do structural analysis of UV joint assembly.
2. ## How to create a revolute joint using RBE2 elements

Hello, I am doing analysis of universal joint assembly (Yoke1, Spider, Yoke2). Spider is a cross member which has 4 bars extruded. So there are 4 revolute joints between trunnion and yokes. Can anybody tell me how to create a revolute joint using RBE2 elements in Radioss Bulk Data? https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQsTSispqWkYwMj6cy6vS8KmDxC2gM9aMmdf_Ffk06VMnPcRNnX To create a revolute joint between 1 bar and 1 yoke hole, I applied the following procedure: 1) Create a center node of the spider bar: node A 2) Create a center node of the yoke hole: node B 3) Create a RBE2 (Independent Node: node A, Dependent nodes: all the nodes on the portion of the bar which will be inside the yoke hole.) 4)Create a RBE2 (Independent Node: node B, Dependent nodes: all the nodes on the yoke hole.) 5) Create a local coordinate system having 'x' axis from node A to node B 6) Assign the node A and node B to local coordinate system. (set reference and set distance) 7) Create RBE2 (Independent Node: node A, Dependent nodes: node B; All dof constrained except dof4 (rotation in x axis) Is this method correct?

4. ## Can we give CONDUCTION interface and CONTACT(SLIDE) interface between the elements of two components?

Hi Rahul R. The information that you asked are as follows: Update Info: Altair Home: C:/Program Files/Altair/12.0 Updates Information: ------------------------------------------------------------ hwdesktop12.0 hwsolvers12.0 Versions: ------------------------------------------------------------ hgtrans.exe: 12.0.0.82 (Jan 29 2013) hm12.dll: 12.0.0.82 (Jan 29 2013) hmopengl.exe: 12.0.0.82 (Jan 29 2013) hst_ng.exe: 12.0.0.82.433863 (Jan 29 2013) hstbatch_ng.exe: 12.0.0.82.433863 (Jan 29 2013) hstdss.exe: 12.0.0.82.433863 (Jan 29 2013) hvp.exe: 12.0.0.82 (Jan 29 2013) hw.exe: 12.0.0.82 (Jan 29 2013) hwmbdmodel.dll: 12.0.0.82 (Jan 29 2013) hwplot.dll: 12.0.0.82 (Jan 29 2013) hwplot3d.dll: 12.0.0.82 (Jan 29 2013) hwpost.dll: 12.0.0.82 (Jan 29 2013) hwtext.dll: 12.0.0.82 (Jan 29 2013) hwvideo.dll: 12.0.0.82 (Jan 29 2013) hwx.exe: 12.0.0.82 (Jan 29 2013) templex.exe: 12.0.0.82 (Jan 29 2013) System Info: System Information: ------------------------------------------------------------ Machine: amd64 OS: windows Windows NT 6.1 User: VIJ Hardware: ----------- Processor: Intel® Core i5-3210M CPU @ 2.50GHz (4 CPUs), ~2.5GHz System Manufacturer: SAMSUNG ELECTRONICS CO., LTD. System Model: 300E4C/300E5C/300E7C Total Physical Memory: 4096MB RAM Operating System: ------------------- Machine name: VIJ-PC Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.150316-1654) Graphics/Display/OpenGL: --------------------------- Card name: Intel® HD Graphics 4000 Chip type: Intel® HD Graphics Family Display Memory: 2661 MB Driver Name: igdumd64.dll,igd10umd64.dll,igd10umd64.dll,igdumd32,igd10umd32,igd10umd32 Driver Version: 8.15.10.2712 Current Mode: 1366 x 768 (32 bit) (60Hz)
5. ## Can we give CONDUCTION interface and CONTACT(SLIDE) interface between the elements of two components?

Thanks @Rahul R. But I have defined contact and tried to perform contact based thermal analysis. I gave conduction type CONTACT. But it is not showing any results.
6. ## Can we give CONDUCTION interface and CONTACT(SLIDE) interface between the elements of two components?

Thanks Prakash sir. But can you suggest me some tutorials regarding these
7. ## Error in size optimization

Hi. I modeled size optimization. It is showing following error. Error: A fatal error occurred duing input model data. More than one response is assigned for the SINGLE objective function. Number of Responses 2 What does this mean? I have 2 responses out of which I gave 1dconstraints and made 1 objective function.
8. ## Can we give CONDUCTION interface and CONTACT(SLIDE) interface between the elements of two components?

Can we give CONDUCTION and CONTACT(SLIDE) interfaces simultaneously between the elements of two components?
9. ## Interfaces in Heat Flux and thermal stress analysis

Hello Sir. The two blocks are in direct contact. They can transfer heat as well as stresses. What are these nodal contact or FREEZE contact? I have applied three interfaces:- =>Created CHBDY Surface elements on the outer surface of the outer block. Interface 1: (Type: CONDUCTION) for the outer heatflux and the outer surface of the outer block. (As in tutorial RD-1080) => Created CHBDY Surface elements on the outer surface of the inner block. Interface 2: (Type: CONDUCTION) for the resulting heatflux at the inner surface of the outer block and the outer surface of the inner block. (As in tutorial RD-1080) => Created Two element sets for the elements of inner and outer blocks. Interface 3 : ( CONTACT Type: Slide) between SET of inner block and SET of outer block. Are these wrong?
10. ## Can we make a 360deg. capture of the optimized model in HyperView?

Thanks Mario. But the link is not working here. ftp://ftp.altair.de/pub/hyperworks/support/macro_toolbars/MVP_Toolbar_2014_Dezember_03.zip Perhaps it's due to .de webpage. Can you please share it with dropbox. Thanks
11. ## Interfaces in Heat Flux and thermal stress analysis

Hi. I have Two cuboid blocks of different materials, one inside another. i.e. Outer block has a cuboid space at the center in which inner block is placed. See Here. http://i.imgur.com/zGuGj.png The outer surface of the inner block is in direct contact with the inner surface of outer block. A very high value constant heat flux(Burned in a furnace ) is applied at the outer surface of the outer block. Now I want to see the thermal and structural behavior of both the blocks. How should I proceed? What are the interfaces that I need to give for the same. I have gone through tutorial RD 1080. but it didn't work.
12. ## Thermal Analysis

Hi. I have Two cuboid blocks of different materials, one inside another. i.e. Outer block has a cuboid space at the center in which inner block is placed. See Here. http://i.imgur.com/zGuGj.png The outer surface of the inner block is in direct contact with the inner surface of outer block.Thermal expansion coefficient of the outer is very low. Where inner block has a significant thermal expansion coefficient. But outer block has large young modulus than the inner. And both the blocks have good thermal conductivity. A very high value constant heat flux(Burned in a furnace ) is applied at the outer surface of the outer block. Now I want to see the thermal and structural behavior of the inner block. And off-course the outer block. 1) Heat flux is applied at the outer surfaces of the outer block. This heat will be transferred to the inner surface of the block. Due to this flux, temperature of the outer block will increase but as it's thermal expansion coefficient is very low, it will not expand much and hence very low stresses. 2) The resulting heat flux at the inner surface of outer block will be transferred at the outer surface of the inner block. Due to this flux, temperature of the inner block will increase and as it's thermal expansion coefficient is high, it will try to expand but will be restrained by the outer block boundaries. This will apply force on the outer block and now stresses on the outer block will be very high. I have modeled this problem in HyperMesh. => Mesh: TetraMesh for both the blocks. =>Property: PSOLID for both the blocks. => Material Input (For both the materials): E, NU, RHO, TREF, A, K =>Created CHBDY Surface elements on the outer surface of the outer block. Interface 1: (Type: CONDUCTION) for the outer heatflux and the outer surface of the outer block. (As in tutorial RD-1080) => Created CHBDY Surface elements on the outer surface of the inner block. Interface 2: (Type: CONDUCTION) for the resulting heatflux at the inner surface of the outer block and the outer surface of the inner block. (As in tutorial RD-1080) => Created Two element sets for the elements of inner and outer blocks. Interface 3 : (Type: CONTACT) between SET of inner block and SET of outer block. => Applied heat flux load on the outer surface of the outer block. LoadCollector1 (Type: QBDY1) : Constant Value. => Created one LoadStep Loadstep 1 : (Type HEAT TRANSFER) and edited the SUBCASE to output Heat and Flux(As in tutorial RD-1080) => Radioss. It shows Analysis Completed. NO ERROR. =>HyperView: I get temperature and flux distribution on the outer block. But I didn't get temperature/flux distribution on the inner block nor I am able to see the displacement and structural behavior for any of the blocks. I should recall here that flux value is very high and in the results I see that flux at the inner surface of the outer block is significant so there should be some flux for the inner block. Please guide me. Also answer the following points. 1) Is there any mistake in my problem setup. 2) Do I need to put any other interface for the innerblock. 3) I gave value TREF in the material CARD MAT1. What does this mean. What I understand from TREF is reference temperature i.e. the initial temperature of both the material. That's why, I didn't give any separate temperature constraints. (But in tutorial RD 1080, some temperature constraints are applied. 4) Do I need to request any other output in Edit Subcase for the STRESS Distribution. If Yes then please Explain the required parameters.
13. ## Error in run

Hi all, I had given run in optistruct for linear static analysis but it shows like this - *** WARNING # ### In static load case 1 the compliance is negative or large 1.389270E+08. Optimization/buckling analysis cannot be performed due to possible rigid body mode. what does this mean???? what is compliance??? Please guide me.
14. ## Exporting to .stl

Hello. I have a .hm model which contains solid elements. Now I want to print it by a 3d printer. For that I need to convert this file into .stl file. .stl file contains surface data but here I only have solid elements. Please guide.