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Thread: Cracking Aluminum hub bars

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  1. #1

    Cracking Aluminum hub bars

    Since I'm a new guy here, and to forums in general, I'm not sure if this is the correct place to ask these questions, but I figured an A+P expert would be a good place to start.
    I was reading the TAG Aviation web site about the Titanium craft. They mentioned cracking aluminum hub bars, which they have replaced with titanium.
    My questions are: How often to aluminum hub bars crack?
    Is this a common problem with aluminum hub bars?
    What is the normal life of an aluminum hub bar?
    Is it feasible to replace the aluminum hub bars with one's made from stainless steel?
    Thanks for the help.

  2. #2
    Aluminum is a life limited metal. Use it long enough and it will crack. The higher the stress the faster it cracks. There are calculations that will tell you useful life. Steel can be designed for infinite life you just have to keep the stress it experiences below 1/2 yield strength.
    Ed L.

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