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  • Users: vtmike
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  1. vtmike

    Youngs modulus, shear modulus and poissons ratio of a thick walled tube

    Hi, We are trying to find directional mechanical properties of a thick walled composite tube (3.5" OD X 1" ID). We know the layup, but it is becoming too complicated to find the young's modulus, shear modulus and poisson's ratio in three principal directions using conventional methods (we use...
  2. vtmike

    Fracture Toughness - Help with Units

    Hi, Has anyone worked with or seen the units kg/mm^1.5 for fracture toughness before? I am trying to convert these to Mpa.sqrt(m) which is typically what we use for all our calculations. Is anyone familiar with a conversion from kg/mm^1.5 to Mpa.sqrt(m)? Any help would be appreciated...
  3. vtmike

    Explicit solver for composites

    Hi, I'm new to the world of fea for composite structures. The problems I will be dealing with are going to involve large strain and will require the use of an explicit code. So I was curious to know if anyone has any experience with explicit codes for composite analysis. Any recommendations...
  4. vtmike

    Amount of water required for 100% saturation of 1 cubic foot volume at 350 F?

    Hi, Can anyone help me out with this problem? I have a volume of 1 cubic foot. This volume has to be saturated to 100% at 350 F. How much volume of water needs to be added to 1 cubic foot of volume in order to get 100% saturation at 350 F? Thanks, Mike
  5. vtmike

    600V DC, 400 mA quick disconnect connector

    Hi, Can anyone recommend a two pin wire-to-wire connector for 600V DC and 400 mA? I need something thats the opposite of what is desired. The connector needs to disconnect relatively easily with little effort. While the connector needs to stay together while shipping, it needs to come apart...
  6. vtmike

    Stress on Rock

    Hi, I have a configuration in which a peice of rock is under hydrostatic pressure (see attached figure) and i'm trying to figure out what the stress on this rock will be. The boundary conditions on the Steel end plates are such that the right and left plates are restricted to move in the -ve X...
  7. vtmike

    Modelling Rock using Drucker Prager Model

    Hi, Does anyone have tips on modelling rock in ANSYS (structural analysis)? From my research so far, it seems I have to use an extended Drucker Prager model. I am having difficulty in understanding what the basic difference is between using a Drucker Prager model & the standard method of...
  8. vtmike

    Tube for hydroforming

    Hi, I'm trying to find a SS304L 4" ID X .024" Wall seam welded or seamless tube for a hydroforming application. All the manufacturers I have talked to have been negative since the wall is so thin. Does anyone here know of any manufacturers that can make tubing with these specs? Thanks, Mike
  9. vtmike

    Change marker color in excel

    Hi, I am just starting to use macros in microsoft excel 2007. Does anyone have tips on how I can change the marker color in a XY scatter plot? 4 20 P 5 21 F 6 22 P 7 23 P 8 24 F 9 26 F For example if the cell in column 3 above has "P", use a green marker & if the cell in column 3 has "F"...
  10. vtmike

    Nitrogen gas density calculation

    Hi, I have a tank with internal volume 2.01 L filled with N2 gas at 308K. The pressure inside the tank is 340.23 atm. I am trying to find the density of gas inside the tank. This is required becase the tool inside this chamber cannot operate above densities of .036 lb/in^3. P = 340.23 atm ; T...
  11. vtmike

    Light load bearing selection

    Hello, I am looking for a light load, low breakaway friction roller bearing. In my search I came across jewel bearings (Ruby, Saphire) but they are too expensive. I have noticed that manufacturers do not list the breakaway friction and no other criteria that relates to the rolling friction. Any...
  12. vtmike

    Gas generator

    Hi, What kind of a liquid or solid state chemical will provide the maximum amount of gas generation. The reaction could be triggered by bringing it into contact with some catalyst by opening a valve for example etc. Basically the maximum final gas volume/initial volume ratio. Thanks, Mike
  13. vtmike

    Hardness Testing in FEA

    Hi, I have the following material properties & wanted to carry out a hardness test in ANSYS to measure maximum deformation when indented by a hard diamond tip, 1) 4340 Steel Case 1 Yield Stress = 69 ksi Ultimate Tensile Stress = 108 ksi Elongation = 22% Density = .283 lb/in^3 Youngs Modulus =...
  14. vtmike

    isotropic and Kinematic hardening

    Hi, I am having difficulty in understanding the Isotropic and Kinematic hardening rules used in nonlinear FEA analysis. One of the references says that the yield surface for an isotropic material model grows uniformly with a constant centre and the yield surface along with its centre moves in a...
  15. vtmike

    Temperature inside an enclosure

    Hi, I have a setup with a hollow steel pipe and a heat source attached to it on its outer surface. The hollow steel pipe has another pipe centralized inside it & it is also sealed off from both ends. A heat flux is provided on the outer surface of the outer pipe to raise its temperature to 200...
  16. vtmike

    Thermal Problem in ANSYS

    Hi, Is it possible to find the internal temperature of a hollow Steel tube at 200 F filled with air at ambient temperature and figure out how long the internal air temperature will take to reach 200 F without using CFD in ANSYS? Thanks, Mike
  17. vtmike

    Post buckling response for tube collpase.

    Hi, I have been working on a model of a tube with external pressure applied to it in ANSYS WB v11.0. The objective of this analysis was to figure out the value of lateral external pressure at which the tube will collapse. The ends of the tube are fixed and the tube has external hydrostatic...
  18. vtmike

    Recommendation for a heater blower

    Hi, My application involves heating an enclosed area of 6'X 2'X 3'(36 ft^3) to a temperature range of 150 F ~ 200 F for a period of 12 hours. This enclosure will be made out of Al sheets & insulated with foam. (This setup is used to dry out an assembly for further testing) Can anyone suggest...
  19. vtmike

    Normal to cut in sheet metal (SolidWorks 2009)

    Hi, I have a sheet metal hollow tube with a laser cut through it as shown in attached image. When I try to perform a normal cut through this tube, I get a rebuild error stating that a "normal cut cannot be performed". Anyone else have this problem? Any suggestions on how I can fix this...
  20. vtmike

    Gasket selection for Flanged connection

    Hi, I am dealing with the design of a flanged connection which will be subjected to high external pressure & temp. Flanges are used to connect two 6" long pipes (sealed on both ends) & this pipe will be subjected to external pressure only along with a temperature of 300F. Since I am new to the...

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