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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...

Thank you stancom for the suggestion!

First off, thank you for your input! Secondly, Since method D2240 shows both samples to be 70 durometer could the varying results using method D1415 be caused by a difference in compression set, since the method is dependent on time? Note: Material 1 and Material 2 should be the same.

Thanks Tom for the insight!

Thanks for pointing those out Tom, I found those specs under the "Apparatus" section of the ASTM book. Something I should have included before: The test results using D2240 Type M were found to be a 70 Durometer however the D1415 Type M test results yielded between 50 and 60 Durometer. In this...

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...