A variety of a damage-tolerant monolithic structures are disclosed, such structures having a substantially-planar element integral with or welded to one or more stiffening elements. Each stiffening element can includes a first stiffening flange having a generally rail-like structure running along th
A variety of a damage-tolerant monolithic structures are disclosed, such structures having a substantially-planar element integral with or welded to one or more stiffening elements. Each stiffening element can includes a first stiffening flange having a generally rail-like structure running along the length of the planar element and one or more webbings connected to the planar element and extending away from the planar element to the stiffening flange, wherein each webbing includes a row of integral holes running along the length of the webbing, the holes being in a shape designed to hinder the propagation of a crack in the monolithic structure.
대표청구항▼
What is claimed is: 1. A damage-tolerant monolithic structure configured to resist cracking, the structure comprising: a substantially-planar element having a length, width and thickness; and one or more first stiffening elements monolithically integrated into the first planar element and running i
What is claimed is: 1. A damage-tolerant monolithic structure configured to resist cracking, the structure comprising: a substantially-planar element having a length, width and thickness; and one or more first stiffening elements monolithically integrated into the first planar element and running in a parallel direction, wherein each first stiffening element includes, a first stiffening flange having a generally rail-like structure running along the length of the planar element; and a first webbing connected to the planar element and extending away from the planar element to the stiffening flange; wherein the first webbing includes a first row of integral holes running along the length of the first webbing, wherein the holes are substantially oval in shape to hinder the progress of a crack in the monolithic structure; a second webbing including a second row of integral holes running along the length of the second webbing, the second row or integral holes having holes staggered relative to the holes in the first row of integral holes; and one or more second stiffening elements monolithically integrated into the planar element on a side of the planar element opposite the first stiffening elements, wherein the second stiffening elements run in a non-parallel direction with respect to the first stiffening elements. 2. The damage-tolerant monolithic structure of claim 1, further comprising a second stiffening flange and wherein the second stiffening flange is connected to the planar element by the second webbing. 3. The damage-tolerant monolithic structure of claim 1, wherein the first stiffening flange is connected to the planar element by the first and second webbing. 4. The damage-tolerant monolithic structure of claim 3, wherein the planar element, the first webbing, the second webbing and the first stiffening flange define a rhombus. 5. The damage-tolerant monolithic structure of claim 1, wherein the one or more second stiffening elements are monolithically integrated into the planar element on the an opposite side of the planar element, diametrically opposed to and running parallel to the first stiffening elements. 6. The damage-tolerant monolithic structure of claim 5, wherein each of the one or more second stiffening elements includes: a second stiffening flange having a generally rail-like structure running along the length of the planar element; and one or more second webbings connected to the planar element and extending away from the planar element to the second stiffening flange; wherein each webbing of the first webbings includes a row of integral holes running along the length of the webbing, the holes being in a shape designed to hinder the progress of a crack in the monolithic structure. 7. The damage-tolerant monolithic structure of claim 1, wherein the second stiffening elements are substantially orthogonal with respect to the first stiffening elements. 8. The damage-tolerant monolithic structure of claim 1, wherein the planar elements is curved at least along a first axis, and the flange of each stiffening element follows the curvature of the planar element. 9. The damage-tolerant monolithic structure of claim 1, wherein the planar element is curved at least along a first axis, and the flange of each stiffening element follows the curvature of the planar element. 10. The damage-tolerant monolithic structure of claim 1, wherein the monolithic structure is composed primarily of a metal. 11. The damage-tolerant monolithic structure of claim 1, wherein the holes are elliptical in shape. 12. The damage-tolerant monolithic structure of claim 1, wherein the holes are substantially circular in shape. 13. A damage-tolerant monolithic structure configured to resist cracking, the structure comprising: a substantially-planar element having a length, width and thickness; and a first means for stiffening and providing crack retardation monolithically integrated into the planar element, the first means for stiffening comprising: a flange means disposed along the length of the planar element; a first webbing means disposed between the planar element and the flange means, wherein the first webbing means includes a first row of integral holes running along the length of the first webbing means, the holes being substantially elliptical in shape; a second webbing means including a second row of integral holes running along the length of the second webbing means, the second row or integral holes having holes staggered relative to the holes in the first row of integral holes; and a second means for stiffening and providing crack retardation monolithically integrated into the planar element on a side opposite the first means for stiffening, wherein the second means for stiffening runs in a non-parallel direction with respect to the first means for stiffening. 14. The damage-tolerant monolithic structure of claim 13, wherein at least one of the first and second means for stiffening and providing crack retardation comprises a two-dimensional matrix of elements forming a plurality of cells.
Biornstad, Robert D.; Blankinship, Bruce C.; George, Terry J.; Ingram, William H., Composite barrel sections for aircraft fuselages and other structures, and methods and systems for manufacturing such barrel sections.
Chapman,Michael R.; Watson,Robert M.; Anderson,Donald A.; Piehl,Marc J.; Sweetin,Joseph L.; Grose,Douglas L., Composite sections for aircraft fuselages and other structures, and methods and systems for manufacturing such sections.
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