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  • Users: PatAero
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  1. PatAero

    Barbed press fits, allowable stress vs required

    I've been trying to calculate material stresses and retention forces of a metal barbed fitting pressed into a plastic body. I need the barb size and engagement strong enough to hold an internal air pressure but not have such a large overlap that pressing the fittings compromises the material...
  2. PatAero

    ASTM D1415 vs. D2240 Type M micro-hardness testing

    Hi all, I am looking to better understand the differences between ASTM D1415 and ASTM D2240 for type M micro-hardness testing. I have had some O-rings tested at two different labs. One lab used D2240 and the other used both D1415 & D2240. The D2240 results from both labs matched however the...

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