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  1. IBD

    Fatigue Life Equivalent Stress question

    Hi Guys, I came across this equation and a writeup for these two methods: 1) hole tension / and hole bearing / bending to determine the stress intensity for essentially a flat plate. However I am not sure where all of the values come from. I am not sure where the 61.23lbs and the 386.09lbs...
  2. IBD

    thin gauge repair doubler (thinner than original)

    Hello, I saw an interesting topic the other day - in which an external aircraft repair was done using a thinner gauge repair doubler. The basics are: - 0.100" thk original chem milled skin - 0.100" filler - 0.063" thk external repair doubler - the reason is that a thicker doubler would...
  3. IBD

    Aluminum Sheet Metal Pull through calculation question

    Hey Guys, I am trying to simplify a Calculation to get a Margin of Safety Calculation for an Aluminum sheet metal pull 'Thru' Calc to ensure enough fasteners are being used and the sheet metal is thick enough etc... I am taking a shot at this here so any suggestions would be greatly...

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