Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by tomotomotomo

  1. tomotomotomo

    Electromagnet suppliers

    Hi, I need help finding a supplier for a small electromagnet. It needs to be able to be slid into a 0.76mm gap. I'm not even sure if it's possible to make electromagnets this thin as I've no experience with them, so if anybody has any supplier names or just expereience with small magnets please...
  2. tomotomotomo

    Vacuum Bag Moulding

    Hi chris, You should start by reading up on the Voigt and Reuss models, also refered to as the Isostrain and Isostress models, respectively. Providing that you have the elastic modulus of both the matrix material (epoxy or polyester) and fibre material (carbon, glass etc.) these forumulae...
  3. tomotomotomo

    pressures due to vacuum bag

    Hi, firstly, i've never used cosmos so please bear with me... I'm looking to simulate a glass laminate being placed inside a vacuum bag, and being de-aired under vacuum. so far i've modelled the glass laminate. How would you guys go about modelling the bag and simulating a vaccum inside that...
  4. tomotomotomo

    anyone have experience modelling laminated glass?

    I initially thought thats what i'd have to do, but is it not more complicated for a viscoelastic material?
  5. tomotomotomo

    anyone have experience modelling laminated glass?

    Hi all, I'm looking to model a glass laminate, consisting of 2 pieces of glass sandwiching a sheet of polyvinyl butyral. the aim is to see stress distributions and the effects of temperature and pressure on the laminate. i've never modelled a visco elastic material before, and i can't find PVB...
  6. tomotomotomo

    p.e.t. film- birefringence pattern help?

    Unfortunately I can't use any other material as the pet is part of an interlayer for variable transmission glazing. we've had different batches of film and they've all displayed the same pattern, even when fresh out the box. it's not due to inclusions of any sort, as i said before i think its to...
  7. tomotomotomo

    p.e.t. film- birefringence pattern help?

    wow thanks for all the replies, I didn't expect much of a response so thanks! Just to clear things up a little: 1. I've used circularly polarised light, which shows the concentric rings, and ive also used plane polarised light which shows the same thing (there is a slight difference but i don't...
  8. tomotomotomo

    p.e.t. film- birefringence pattern help?

    SorryI forgot to mention, I'm looking for a way to reduce/eliminate this effect, and also an explanation of why its happening Thanks
  9. tomotomotomo

    p.e.t. film- birefringence pattern help?

    Hi yes the glass is flat and shows no distortion of light. Also, the film shows this pattern even when it isn't between glass, I only put it between the glass to support it and rpevent further stresses. I think it may be due to the orientation of the polymer chains, but that's as far as I've got :s
  10. tomotomotomo

    p.e.t. film- birefringence pattern help?

    Hello all, just a quick question which I really hope someone can help with. A 125 micron thick transparent p.e.t. film is to be used as part of a glass laminate but is showing a circular pattern under polarised light. The image i've attached was taken using a circularly polarised light source...
See more

Part and Inventory Search

Back
Top