US 9,809,297 B2
Structures containing stiffeners having transition portions
Jordan D. Charles, Seattle, WA (US)
Assigned to The Boeing Company, Chicago, IL (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Aug. 26, 2015, as Appl. No. 14/835,829.
Prior Publication US 2017/0057615 A1, Mar. 2, 2017
Int. Cl. B64C 3/26 (2006.01); B32B 37/02 (2006.01); B32B 3/26 (2006.01); B32B 3/18 (2006.01); B29D 99/00 (2010.01)
CPC B64C 3/26 (2013.01) [B29D 99/0003 (2013.01); B32B 3/18 (2013.01); B32B 3/263 (2013.01); B32B 37/02 (2013.01); B32B 2305/076 (2013.01); B32B 2305/08 (2013.01); B32B 2605/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A stiffener comprising:
a first stiffener portion having a first cross-sectional profile that is constant along the first stiffener portion;
a second stiffener portion having a second cross-sectional profile that is constant along the second stiffener portion, wherein the second cross-sectional profile of the second stiffener portion is different from the first cross-sectional profile of the first stiffener portion; and
a transition stiffener portion tapering from the second stiffener portion to the first stiffener portion;
charges laminated together to form the first stiffener portion, a part of the second stiffener portion, and a part of the transition stiffener portion; and
a web, wherein:
a part of the second stiffener portion and a part of the transition stiffener portion are formed by the web;
the web comprises a base and a rib perpendicular to the base; and
the base of the web is parallel to the charges; and wherein:
one of the charges has a width that gradually decreases along the transition stiffener portion from the second stiffener portion to the first stiffener portion;
the charges have a combined height that gradually increases along the transition stiffener portion from the second stiffener portion to the first stiffener portion;
the base of the web has a width that progressively decreases along the transition stiffener portion from the second stiffener portion to the first stiffener portion; and
the rib of the web has a height that progressively decreases along the transition stiffener portion from the second stiffener portion to the first stiffener portion.