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RE: ASD Design of Threaded Fasteners

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 I believe that the min. root area is an area of material bounded by the thread root radius. For a bolt to fracture, the failure plane must pass through a portion of the thread area in addition to the root area. The tensile stress area accounts for this.
 
-Heath

 
 -----Original Message-----
From: Chris Towne [mailto:ctowne(--nospam--at)chaptech.com]
Sent: Tuesday, January 30, 2001 2:09 PM
To: SEAINT List Server
Subject: ASD Design of Threaded Fasteners

Why is the Tensile Stress area larger than the Min. Root area for threaded fasteners? (See pg 4-147 of ASD 9th Edition) 
 
Shouldn't I be using the smallest cross section for my design?
 
Thanks in advance,
 
Chris Towne