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Recent content by cedro

  1. cedro

    PET GMT plate supplier

    Does anyone know of european supplier for extruded plates in PET- glassfiber (GMT prepreg material)?
  2. cedro

    Poisson Ratio for polymers

    Hello, I use 0.38 for ABS and PC. Generally I use 0.4 for thermoplastics, near 0.5 for rubberlike polymers and down to min 0.35 for glass filled or mineral filled polymers. This is due for RT and moderate strain levels. At high level of plastic strain you would need something else to be...
  3. cedro

    BMC composite for online painting

    I'm investigating BMC in a automotive part for online painting with a electrocoating owen of 200 degrees C for 15-30 min. I know SMC's are available that can handle this temperature with the right surface treatment, vacuum assisted moulding etc. BMC is needed in this case for geomtrical...
  4. cedro

    Glassfibre and plywood properties

    hmmm. I still dont understand how you can make a shell of glassfibers without a matrix of some kind. Note that I have given FIBER DATA, not data for a plate with distributed fibers - it is not possible to have 100 volume-% fibers in a shell. If you apply my data directly it will correspond to a...
  5. cedro

    Glassfibre and plywood properties

    Density of glass is 2.6 g/cm3. By the way it sounds from your description (1 mm ceiling) that it is not really glass fiber but a composite: plastic-glassfiber. Then you first of all need the ammount of glass fiber and type of plastic to say something about material properties. Plywood density...
  6. cedro

    Glassfibre and plywood properties

    Glassfibre: isotropic, linear elastic - brittle failure. Fails at about 1-2% elongation (depends on quality). E-modulus is 72 GPa and Poisson ratio 0.22. Plywood properties are for sure dependent on degree of moisture, would, orientation of layers etc. Anything between 20-40 GPa in E-modulus...
  7. cedro

    materialdirections in directions of principal stress of a shell

    For my user defined material model applied to a shell section this is needed. My idea is to apply a small load with a linear elastic model to get the stress tensor. Then I calculate the angle to the principal stress directions based on this and store it as solution dependent state variable...
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