COMPOSITE STIFFENERS FOR AEROSPACE VEHICLES
First Claim
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1. An aerospace vehicle comprising a plurality of composite stiffeners, each stiffener of the plurality having a stack of plies of reinforcing fibers;
- at least some of the plies in the stack having reinforcing fibers oriented at ±
α
with respect to an axis of primary loading, where α
is between 2 and 12 degrees;
at least some of the plies having reinforcing fibers oriented at ±
β
with respect to the axis of primary loading, where β
is between 50 and 85 degrees.
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Abstract
An aerospace vehicle includes a plurality of composite stiffeners. Each stiffener of the plurality has a stack of plies of reinforcing fibers. At least some of the plies in the stack have reinforcing fibers oriented at ±α with respect to an axis of primary loading, where a is between 2 and 12 degrees. At least some of the plies in the stack have reinforcing fibers oriented at ±β with respect to the axis of primary loading, where β is between 50 and 85 degrees.
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Citations
20 Claims
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1. An aerospace vehicle comprising a plurality of composite stiffeners, each stiffener of the plurality having a stack of plies of reinforcing fibers;
- at least some of the plies in the stack having reinforcing fibers oriented at ±
α
with respect to an axis of primary loading, where α
is between 2 and 12 degrees;
at least some of the plies having reinforcing fibers oriented at ±
β
with respect to the axis of primary loading, where β
is between 50 and 85 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- at least some of the plies in the stack having reinforcing fibers oriented at ±
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10. An article comprising an aerospace vehicle stiffener, the stiffener including a base and a web, at least one of the base and web including a stack of plies of reinforcing fibers, at least 50% of the reinforcing fibers oriented at ±
- α
with respect to an axis of primary loading, where α
is between 2 and 12 degrees. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- α
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18. An article comprising an aerospace vehicle stiffener, the stiffener including a base and a web, the web including plies of reinforcing fibers for providing strength in tension and compression along an axis of primary loading, the web also including plies of reinforcing fibers oriented at ±
- β
degrees with respect to the axis of primary loading, where β
is between 50 and 85 degrees, wherein the fibers oriented at ±
β
degrees are biased towards outer surfaces of the web to increase stiffness in buckling and transverse loading. - View Dependent Claims (19, 20)
- β
Specification