초록

A three-dimensional (3D) woven preform with channels in the through thickness direction developed for applications such as forming light weight preforms with an increased thickness.

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1. A three-dimensional (3D) woven preform comprising: a plurality of groups of warp yarns;a plurality of groups of weft yarns, the warp yarns woven with the weft yarns to form a mock leno structure having a plurality of layers of the 3D woven preform,wherein a first group of weft yarns in a particul

1. A three-dimensional (3D) woven preform comprising: a plurality of groups of warp yarns;a plurality of groups of weft yarns, the warp yarns woven with the weft yarns to form a mock leno structure having a plurality of layers of the 3D woven preform,wherein a first group of weft yarns in a particular layer includes at least two first weft edge yarns and a first set of at least one weft central yarn, the first set of at least one weft central yarn binds warp yarns in the particular layer to warp yarns in a subsequent layer and the at least two first weft edge yarns include one disposed on each side of the first set of the at least one weft central yarn, andwherein a second group of weft yarns in the particular layer includes at least two second weft edge yarns and a second set of at least one weft central yarn, the first set of at least one weft central yarn binds warp yarns in the particular layer to warp yarns in a preceding layer and the at least two second weft edge yarns include one disposed on each side of the second set of the at least one weft central yarn, such that through thickness channels are formed in the multilayer preform. 2. The 3D woven preform of claim 1, wherein a first group of warp yarns in the particular layer includes a first set of at least one warp central yarn that binds weft yarns in the particular layer to weft yarns in the subsequent layer and at least two first warp edge yarns, one on each side of the first set of the at least one warp central yarn, andwherein a second group of warp yarns in the particular layer includes a second set of at least one warp central yarn that binds weft yarns in the particular layer to weft yarns in the preceding layer and at least two second warp edge yarns, one on each side of the second set of the at least one warp central yarn. 3. The 3D woven preform of claim 2, wherein the first and second weft edge yarns are woven over the first set of at least one warp central yarn and under the second set of at least one warp central yarn in the particular layer, andwherein the first and second warp edge yarns are woven over the first set of at least one weft central yarn and under the second set of at least one weft central yarn in the particular layer. 4. A composite comprising: a three-dimensional (3D) woven preform of claim 1,wherein the preform is impregnated with matrix material. 5. A composite comprising: a three-dimensional (3D) woven preform of claim 3,wherein the preform is impregnated with matrix material. 6. A method of forming a three-dimensional (3D) woven preform comprising: forming groups of warp yarns in a plurality of layers of the 3D woven preform;forming groups of weft yarns in the plurality of layers of the 3D woven preform;forming a mock leno structure by weaving the warp yarns in the warp groups with weft yarns in the weft groups,wherein a first group of weft yarns in a particular layer includes at least two first weft edge yarns and a first set of at least one weft central yarn, the first set of at least one weft central yarn binds warp yarns in the particular layer to warp yarns in a subsequent layer and the at least two first weft edge yarns include one disposed on each side of the first set of the at least one weft central yarn, andwherein a second group of weft yarns in the particular layer includes at least two second weft edge yarns and a second set of at least one weft central yarn, the first set of at least one weft central yarn binds warp yarns in the particular layer to warp yarns in a preceding layer and the at least two second weft edge yarns include one disposed on each side of the second set of the at least one weft central yarn, such that through thickness channels are formed in the multilayer preform. 7. The 3D woven preform of claim 6, wherein a first group of warp yarns in a particular layer includes at least two first warp edge yarns and a first set of at least one warp central yarn, the first set of at least one warp central yarn binds weft yarns in the particular layer to weft yarns in a subsequent layer and the at least two first warp edge yarns include one disposed on each side of the first set of the at least one warp central yarn, andwherein a second group of warp yarns in the particular layer includes at least two second warp edge yarns and a second set of at least one warp central yarn, the first set of at least one warp central yarn binds weft yarns in the particular layer to weft yarns in a preceding layer and the at least two second warp edge yarns include one disposed on each side of the second set of the at least one warp central yarn. 8. The 3D woven preform of claim 7, wherein the first and second weft edge yarns are woven over the first set of at least one warp central yarn and under the second set of at least one warp central yarn in the particular layer, andwherein the first and second warp edge yarns are woven over the first set of at least one weft central yarn and under the second set of at least one weft central yarn in the particular layer. 9. A method of forming a composite comprising: forming three-dimensional (3D) woven preform of claim 6,impregnating the 3D woven preform with matrix material. 10. A method of forming a composite comprising: forming three-dimensional (3D) woven preform of claim 8,impregnating the 3D woven preform with matrix material.