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  1. fxue

    FDA approved polymers for medical device manufacturing equipements

    Many thanks for the info. That is really helpful. Mick
  2. fxue

    FDA approved polymers for medical device manufacturing equipements

    Dear all, Hope you are all keeping well. I am searching for polymers that can be used for contact lens carrier during manufacturing process to replace stainless steel that is currently used. The ideal material has to meet the following requirements: * Good UV resistance * Withstand 80 degree...
  3. fxue

    Strain conversion

    Dear all, First of all, let me explain the problem briefly. I was set to model a spherical cell contained by a block of gel. I was trying to calculate the circumferential strain across the cell surface. The output results from the simulation provide many sorts of strain, eg. Principal strains...
  4. fxue

    Octahedral shear strain conversion

    Hi, I'm trying to apply a strain in X-dirction (1,0,0) on the top surface of a block of gel that is equivalent to a given amount of Octahedral shear strain. Could someone give me some suggestions on the conversion, please? Many thanks.
  5. fxue

    Pore fluid definition

    Hi, I'm trying to calculate the fluid velocity of a multi-layered gel under compression. When defining the material properties, there is a list of options to choose from under Pore Fluid. I've dealt with permeability with another project before. But in this application, the permeability is...
  6. fxue

    Various Strain components

    Hi guys, I am trying to simulate micro-indentation tests on given materials. I asked to compare a list of strains across different materials, namely, "Hydrostatic strain", "Deviatoric strain", "equivalent strain" and "effective strain". I am a bit confused about these strains and don't know...
  7. fxue

    Viscoelasticity

    Thanks, Nagi. I think I made a mistake using the static analysis. Thanks very much for your help. Michael
  8. fxue

    Viscoelasticity

    Hi guys, I am trying to model the viscoelastic behaviour of a tested material. In Abaqus, I used Prony under time domain to assign viscoelastic properties. When I tested it with two different loading rates, I didn't see much change from force-deflection curve. My question is if this is due to...
  9. fxue

    Connectors Dimensions

    Hi, I am trying to use connectors to link the end nodes of two beams in Abaqus. Is there any way to assign the dimensions of the connectors, eg, diameters? Thanks. Feng
  10. fxue

    Error msg with Contact

    Thanks for your reply. When I re-checked my model yesterday, I found that it wasn't the contact that was causing the error but something else, most likely to be one of the "Tie" functions I used in the model. Does it make more sense? Any further hints based on that? Thanks, Feng
  11. fxue

    Error msg with Contact

    Hi guys, I am trying to model a block containing a sphere under disp. load on the block. I've set up contact between the sphere and the surrounding surface from the block. I got the following error msg. Can anybody give me some advise? ***ERROR: THE NORMAL TO ELEMENT 1 INSTANCE...
  12. fxue

    Agarose gel

    Hi guys, I am trying to use agarose gel to simulate the 3D loading environment of cultured cells. Could anyone give me some hints on its material properties and how to assign these properties to my model? Thanks in advance, Feng
  13. fxue

    Viscoelastic properties

    Hi guys, I'm trying to assign viscoelastic material properties to a part of my model. By searching from the literatures, I've collected some parameters that were achieved from creep tests on the material. These parameters are: effective viscosity, relaxation time and shear constant. Could...
  14. fxue

    Pre-stress/Pre-tension

    Hi guys, I am trying to create a tensegrity structure with pre-stress/pre-tension on the cables. I am wondering whether there is an element type in Abaqus such that I could assign pre-stress/pre-tension on (like the SPAR element in ANSYS). Many thanks. Feng
  15. fxue

    Tensegrity Structure

    Thanks for the replies, guys. Feng
  16. fxue

    Tensegrity Structure

    Hi guys, I am trying to create a 6-strut Tensegrity structure as a part of my on-going project. I am wondering whether there is a way or certain rules to locate the vertices of the Tensegrity structure so that minimum displacement occurs when a pre-tension is assigned to the cables. Many...
  17. fxue

    Beam element

    Hi everyone, Does anybody know if there is a type of beam or truss element in ABAQUS that a stress can be assigned? Many thanks. Feng
  18. fxue

    Displacement between steps

    Thanks very much, Rob. I appreciate your help. Feng
  19. fxue

    Displacement between steps

    Hi, I've developed an FE model that contains 3 steps. I am wondering if there is a way to calculate the displacement that purely caused by step 3 (not the overall displacement outputed from step 2 and step 3) of a node. Many thanks. Regards Feng
  20. fxue

    Prestress

    Hi, Could anyone tell me how to assign prestress to an element (say, truss element or beam element), which is a part of the structure? Many thanks. Feng

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