Update to Potted Inserts – Methods and Allowables

May 4, 2016

This post here looks at the a public domain method for the strength of potted inserts – However it is very important to note that the two main references for these methods are flawed in some way. This is the introduction from our (soon to be released for draft review) free engineering textbook:

This chapter uses two main sources (ECSS-E-HB-32-22A, 2011) and (ESA-PSS-03-1202, 1987).

The 2011 document is a rewrite of the original 1987 document and the general descriptions are an improvement but the numerical analysis includes many errors that are not in the 1987 original.

However, much of the graphical strength data in the 1987 original reference is incorrect. Issue 1 of the 1987 report includes a note at the start of this report to this effect.

This incorrect graphical data is omitted from the 2011 rewritten report.

Because of the condition of the two main references used for this report much of the descriptive material and illustrations are taken from (ECSS-E-HB-32-22A, 2011), the analytical methods are taken from (ESA-PSS-03-1202, 1987)

Another, older reference (US Forest Service Report No . 1845, 1955) has a method derived for out plane loading with some correlation between analysis and test which produces a similar load distribution with respect to radial distance as the method shown in section 5.7.3.6

A key part of using references is knowing their errors and weaknesses, and this is difficult to discover unless the author issues a list of errors or corrections, or you correlate (or find a lack of correlation) between different references. Anyway, I wanted to include this for the sake of completion.


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