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US 8,408,493 B2Granted
Composite stringer end trim
AssigneeThe Boeing Company
InventorsJoshua D. Barnard, Brian W. Arent, Chun-Liang Lin, Hangki Lee, Carlos Alberto Paez, Bernhard Dopker
Life of this patent
Estimating the term…
Abstract
A stringer having a stringer end trim that reduces pull-off forces in a stringer connection structure, including a stringer body; a stringer free edge provided on said stringer body; and a stringer end trim having at least one curvature provided in the stringer free edge forming the stringer connection structure.
Claims28
A stringer having a stringer end trim configured to reduce pull-off forces, the stringer comprising:
- a stringer body having a first stringer flange, a second stringer flange and a stringer web extending between said first stringer flange and the second stringer flange;
- and
- a stringer free edge on the stringer body, the stringer free edge comprising the stringer end trim, the stringer end trim having at least one asymmetric curvature, the stringer end trim in the stringer web.
A wing-to-body structure, comprising:
- a side of body rib;
- a stringer having a stringer body carried by the side of body rib, the stringer body comprising a first stringer flange, a second stringer flange and a stringer web extending between the first stringer flange and the second stringer flange, a stringer free edge on the stringer body, a stringer end trim having at least one radius having an asymmetric curvature in the stringer free edge in the stringer web;
- and
- a wing skin panel carried by the side of body rib and said stringer.
1 more element
A method comprising:
- trimming at least one asymmetric curvature in a stringer free end of a stringer, the stringer comprising a first stringer flange, a second stringer flange and a stringer web extending between the first stringer flange and the second stringer flange, the stringer free end on the stringer web.
A stringer, comprising:
- a laminated composite stringer body having a first stringer flange, a second stringer flange and a stringer web extending between the first stringer flange and the second stringer flange;
- a stringer free edge provided on said stringer web;
- and
- a double radius stringer end trim provided in the stringer free edge and having a first parabolic and continuously-varying edge radius, a second parabolic and continuously-varying edge radius, and a convex transition radius joining the first edge radius and the second edge radius.
1 more element
A wing-to-body structure, comprising:
- a side of body rib;
- a stringer having a laminated composite stringer body carried by the side of body rib and including a first stringer flange, a second stringer flange, a stringer web extending between the first stringer flange and the second stringer flange, a stringer free edge provided on the stringer web and a double radius stringer end trim provided in the stringer free edge and having a first parabolic and continuously-varying edge radius, a second parabolic and continuously-varying edge radius and a convex transition radius joining the first edge radius and the second edge radius;
- a wing skin panel carried by the side of body rib and said first stringer flange of the stringer;
- and
- a stringer cap fitting carried by the second stringer flange of said stringer.
2 more elements
A method for tailored reduction of stress concentrations within a free end of a stringer, comprising:
- providing a stringer having a laminated composite stringer body including a first stringer flange, a second stringer flange, and a stringer web extending between the first stringer flange and the second stringer flange with a stringer free end on the stringer web;
- trimming a double radius stringer end trim having a first parabolic and continuously-varying radius, a second parabolic and continuously-varying radius and a convex transition radius joining the first radius and the second radius in the stringer free end;
- providing a wing-to-body structure having a side-of-body rib and a wing skin panel carried by the side-of-body rib;
- and
- assembling the stringer into the wing-to-body structure by joining the stringer body of the stringer to the side-of-body rib and the wing skin panel.
2 more elements
A method comprising:
- forming at least one radius having an asymmetric curvature in a stringer free end of a stringer, the stringer comprising a first stringer flange, a second stringer flange and a stringer web extending between the first stringer flange and the second stringer flange, the stringer free end on the stringer web.
Dependencies are inferred from the claim text.