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  1. mmhaynes

    CTE and elastic modulus of epoxy resin and AS4 carbon fiber as a function of temperature

    Not really a sales pitch here, but we can do that experiment for you. What type of temperature range are you looking for? We perform CTE tests via a comparative strain gage technique from 4 K to 390K. Mark Haynes Senior Engineer Composite Technology Development
  2. mmhaynes

    Iosipescu Gage

    Those are really long gages for that test. We always run either the EA-06-062TH-350 or SK-06-062TV-350 patterns depending on whether its at room temp or cryogenic temps. The biggest key with these little guys is to get them lined up just so before bonding them down. Mark the specimens carefully...
  3. mmhaynes

    Sandwich skin - shear properties

    The ASTM C273 Standard for Shear Properties of Sandwich Core Materials is what you want, I think. Its an easy test once you have the fixturing, I've done it at both elevated and cryogenic temps. Mark Haynes Senior Engineer Composite Technology Development
  4. mmhaynes

    Vacuum Infusion: Increasing Fiber Volume Fraction

    Michael, Typically during a VARTM process, there are a number of things that can be done to ensure the desired FVF. One consideration is the rate at which you allow the resin transfer into your part, if you open the gate too wide, it allows the bag to overfill resulting in a low FVF. Reducing...
  5. mmhaynes

    GRP Specimen size when conducting 3 point flexural tests

    It depends greatly on just what properties you are trying to evaluate. The BS2746 is similar to the ASTM D2344 and it is used primarily as a screening test to downselect resin/matrix systems. It will give you Apparent Shear strength, and an idea (when using the proper formula) of the elastic...

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