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  1. Lirock

    Smaller element size means higher secondary stress?

    Hi, I used ASME Volumn VIII, the chapter " Design based on stress". For the primary stress, I calculated them with the function STRESS = E x STRAIN, and it has allowable stress Sm,which is the yield stress divided by safety factor. In the results of FEM, I can use the displacement of nodes to...
  2. Lirock

    Smaller element size means higher secondary stress?

    Hi, I got a question about element size and stress. We know that in the area of geometry discontiguous, boundary condition applying and node force applying, there usually gets secondary stress.According to ASME, if we use Sm for primary stress criteria, then we should use 1.5Sm for secondary...
  3. Lirock

    Using CYCLIC with mixed element type

    Hi, Thank you for your help. I have found my mistake and succeed in this problem. CYCLIC can be used in fixed element model.
  4. Lirock

    Using CYCLIC with mixed element type

    Hi,everyone I got a question about the using of command 'CYCLIC'. In my model, there are two types of element,SOLID95 and SHELL93. I used CYCLIC to configue the model as a cyclic symmetric one. But after solution, I found a problem that at the share line of the two elment type, the meshing did...
  5. Lirock

    Apply bending moment on a cylinder meshed with SHELL93

    Hi, A cylinder with internal diameter d=0.09 mm, external diameter D=0.11 mm, and the length L=100mm.One end is fixed,and apply a bending moment 1mm.N on the other one.We can get the maximum deflection equals about 7.56 mm with formula. I did it with ANSYS in two ways: 1. built a mass...
  6. Lirock

    Apply bending moment on a cylinder meshed with SHELL93

    sorry. In the commands, the line "F,P51X,MX,100" should be "F,P51X,MX,1", and line " F,P51X,MX,100/32" should be "F,P51X,MX,1/32"
  7. Lirock

    Apply bending moment on a cylinder meshed with SHELL93

    Hi, A cylinder with internal diameter d=0.09 mm, external diameter D=0.11 mm, and the length L=100mm.One end is fixed,and apply a bending moment 1mm.N on the other one.We can get the maximum deflection equals about 7.56 mm with formula. I did it with ANSYS in two ways: 1. built a mass...
  8. Lirock

    Scaled modal analysis?

    I think the main purpose of modal analysis is to get natural frequencies of structures. And then compare with the frequencies of dynamic loads to avoid resonance. And the stress and displacement appear only if the frequencies of dynamic loads are close to the results of modal analysis, So it...
  9. Lirock

    On meshing on an assembly

    Hello, As Alex said, you should either glue the volumes or define contact elements on the interface. Here is another way, constrain equation. This method usually is used when there are some bolts on the interface. Rock
  10. Lirock

    Contact problem, no convergence

    Hi, I am learning contact analysis and I have a problem here. I want to constrain an axis by the friction between it and the sleeve, but the solution went a very time without any error or results. I don't know why.Could any one help me to have a check? The following is the commands: /PREP7...
  11. Lirock

    How to classified primary stress,secondary stress and peak stress?

    Hi, I have a question about the classification of primary stress,secondary stress and peak stress in the postprocess after analysis with ANSYS.As we know, in the area displacement constrains applied or geometry discontidiscontinuity, some very large stress would appear, which usually contains...
  12. Lirock

    What's the range of friction factor between steel and concrete?

    Hi, I met a problem,which needs to know the friction factor between steel and concrete. I used 0.4, but someone said it's the maximum value and not saft for calculation.So I wonder the range. Does anyone know it? Thank you! Rock Li
  13. Lirock

    How to calculate the appendiculate force between concrete and plate?

    Hi, I met a question.I need to determine the force between concrete and steel plate in it.I seek information about this, but got nothing. Can anyone give me some advice? Rock Li
  14. Lirock

    Question about periodic symmetry analysis with muti-kinds element?

    Hi,guys: It still doesn't work for me.I don't know the reason and I am going to find some help in ANSYS company. Thank you for your help! Rock Li
  15. Lirock

    Question about periodic symmetry analysis with muti-kinds element?

    Hi, I tried the advice,chosing the area and excute 'AMESH',but nothing changed. I made a excersice and paste the commands below.It's just end at the command 'AMESH'. You may will see the problem I met. /PREP7 wpro,,,90.000000 WPCSYS,-1,0 wpro,,90.000000, CSYS,4 RECTNG,2,4,-0.5,0.5...
  16. Lirock

    Question about periodic symmetry analysis with muti-kinds element?

    Thank you,guys.I will try your advice. Another thing,I noted that for a periodic modal analysis, the output appears as 'nodial diameter xxxx' in old version,such as ANSYS6.0 etc.,but in ANSYS9.0, it appears as 'harmonic index xxxx'. Is it a development or two kinds formats?I know it has no...
  17. Lirock

    Question about periodic symmetry analysis with muti-kinds element?

    Hi,everyone: I did a periodic symmetry modal analysis.The structure contains both solid and shell parts.According to the help file,I used 'CYCLIC' command,which make me have to mesh the structure with 'VMESH' and 'AMESH' commands. I got solid mesh in the solid parts with 'VMESH' using...
  18. Lirock

    Applying Shell pressure in Ansys

    Hi, As Alex said, it's just the mark of pressure.But you really want to see the pressure applied on element, you can change the symbol of pressure, you can use '/PSF' command to chang the symbol to arrows,which makes it easy to check if the direction of pressure is right. Because when shell...
  19. Lirock

    Vibration Response Problem

    Hi, Maybe you should try spectrum analysis, which is usually used for vibration analysis. Rock Li
  20. Lirock

    Animation

    Hi, You can use 'PLDI' and 'ANMODE' to start the animation.But I don't know the command to stop it. I made a simulation with GUI and tried to get the command from log file,but got nothing.Maybe the only way to stop it is the control box. Rock Li

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