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Author Topic: BJSFM Analysis General Assumptions  (Read 24366 times)


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BJSFM Analysis General Assumptions
« on: July 07, 2009, 08:31:12 AM »
What are the general assumptions used in the BJSFM analysis
David Johnson
Hitech Global Solutions Inc


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Re: BJSFM Analysis General Assumptions
« Reply #1 on: July 07, 2009, 08:43:05 AM »
For a standard bearing and bypass analysis, the  BJSFM general assumptions include:

a) Pan head fastener  (Csk requires a correction)
b) Infinitely wide panel (E/D and W/D could require a correction)
c) Uniform bolt bearing load (double shear test configuration), (Single shear configuration requires a correction)
d) Finger tight fastener
e) Joint laminate is between 40% and 60% 45 deg plies
f) Do default = 0.016 (Ref MIL HDBK 17), (Do is also user defined)
g) Lamina analysis (pristine allowables)
h) Maximum strain theory (alternate failure options available)