Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Non-destructive testing - Porosity

  1. Mar 24, 2010 #1
    Hi all,

    We have a bearing pad at work that failed a porosity test and could not hold pressure (this was the pad itself and not the babbit surface).

    I need to look into some NDT testing that will give us an idea about the porosity. I have googled and some sites say different things, from what I gather it will be penetrate testing, radiography or eddy current.

    Basically I need a test that will allow me to say to someone that this pad needs to be repaired so that "XXX test" reveals that surface defects are less than "xxx (some sort of classification that corresponds to the test method)" so that it will past its porosity test.

    This will be more specific than simply saying that the pad needs to be repaired so that the porosity test will be passed.

    I would be interested in hearing your opinions. Thanks for all your help.
  2. jcsd
  3. Mar 24, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Penetrant testing only works for surface or open porosity, i.e. porosity connected to the surface.

    Radiography might work depending on the type of porosity. Radiography usually looks for voids, but density (1 - porosity) would require calibration (with standards of know porosity/density).

    Eddy-current may not work - it is usually used for surface flaws (voids) - and it also would require calibration.

    Depending on the size, helium/gas pycnometry might work.

    UT might also work.

    Look here for some ideas.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - destructive testing Porosity Date
Easy way to test for Fusel Alcohols in ethanols Aug 1, 2017
Young's Modulus of Al Apr 30, 2017
Testing multipole expansion Application ID: 31901 Oct 22, 2016
Switchable Porosity Jun 26, 2015