Composite preforms including three-dimensional interconnections
Methods creating composite preforms with a three-dimensional weaving pattern include stacking material layers and then connecting them with interlayer reinforcements. First and second layers are aligned and separated by a first layer spacing. First interlayer reinforcements are then inserted through at least the first and the second layers. At least a third layer is aligned with at least the first and second layers. Second interlayer reinforcements are inserted through at least the second and third layers, using the first layer spacing between the first and second layers to manipulated the second interlayer reinforcements during insertion. Following the insertion of at least the second interlayer reinforcement, this layer spacing is closed to bring the first and second layers into contact. Further layers and interlayer reinforcements may be added, using additional layer spacings to manipulate additional interlayer reinforcements to form complex three-dimensionally woven composite preforms.
1. A method for producing a fiber composite preform or portion thereof, the method comprising:
aligning first and second material layers;
positioning the first and second material layers at a distance from each other to form a first layer spacing therebetween;
inserting first interlayer reinforcements through the first and the second material layers;
aligning at least a third material layer with at least the first and second material layers;
inserting second interlayer reinforcements through at least the second and third material layers, wherein the first layer spacing enables the second interlayer reinforcements to be manipulated during insertion; and
after inserting the second interlayer reinforcements, applying a tensioning force to the first interlayer reinforcements to close the first layer spacing and bring the first and second material layers into contact, wherein at least a portion of the tensioning force is applied in a direction substantially parallel to the first and second material layers.
2. The method of claim 1 , wherein at least one of the material layers includes a fabric.
3. The method of claim 2 , wherein the fabric includes a woven fabric.
4. The method of claim 3 , wherein the woven fabric includes an open weave.
5. The method of claim 1 , wherein at least one of the material layers includes a matrix material.
6. The method of claim 1 , wherein the first and second interlayer reinforcements include fiber reinforcements.
7. The method of claim 6 , wherein at least one of the first and second interlayer reinforcements includes carbon fiber.
8. The method of claim 6 , wherein at least one of the first and second interlayer reinforcements includes glass fiber.
9. The method of claim 6 , wherein inserting the first interlayer reinforcements includes weaving the first interlayer reinforcements through the first and second material layers.
10. The method of claim 6 , wherein:
inserting the first interlayer reinforcements includes securing the first interlayer reinforcements in a fiber tensioning system; and
wherein applying the tensioning force to the first layer reinforcements to close the first layer spacing includes tensioning the first interlayer reinforcements using the fiber tensioning system.
11. The method of claim 1 , wherein at least one of the material layers include openings to allow passage of at least one of the first and/or second interlayer reinforcements.
12. The method of claim 11 , wherein:
the openings include first openings in the second material layer;
inserting the first interlayer reinforcements includes inserting the first interlayer reinforcements through a first portion of the first openings in the second material layer; and
inserting the second interlayer reinforcements includes inserting the second interlayer reinforcements through a second portion of the first openings in the second material layer.
13. The method of claim 12 , wherein:
the openings include second openings in the third material layer;
inserting the second interlayer reinforcements includes inserting the second interlayer reinforcements through a first portion of the second openings in the third material layer.
14. The method of claim 1 , wherein the second interlayer reinforcements are inserted through at least one additional material layer between the second and third material layers.
15. The method of claim 14 , wherein additional interlayer reinforcements are inserted through the at least one additional material layer between the second and third material layers at intervals corresponding to a number of the additional interlayer reinforcements.
16. The method of claim 1 , wherein aligning at least the third material layer with at least the first and second material layers includes separating the second material layer and the third material layer with a second layer spacing.
17. The method of claim 1 , wherein the material layers represent cross-sections of at least a portion of a three-dimensional model.
18. The method of claim 17 , wherein at least two of the material layers have different cross-section shapes.
19. The method of claim 17 , wherein at least one of the material layers includes at least two disjoint cross-sections.
20. The method of claim 1 , wherein at least one of the material layers includes at least two different materials.
21. The method of claim 20 , wherein the at least two different materials includes a removable support material.
22. The method of claim 1 , further comprising utilizing an interlayer arm positioned within the first layer spacing to facilitate passing the second interlayer reinforcements through the second and third material layers.
23. The method of claim 22 , wherein the interlayer arm includes rapiers or hollow needles configured to facilitate passing the second interlayer reinforcements through the second and third material layers.
24. The method of claim 22 , wherein the interlayer arm includes a vacuum tool, mechanical gripper, or electromagnet configured to facilitate passing the second interlayer reinforcements through the second and third material layers.
25. The method of claim 1 , wherein inserting the second interlayer reinforcements comprises passing a first portion of the second interlayer reinforcements through the third material layer and then the second material layer, passing a second portion of the second interlayer reinforcements through the open first layer spacing substantially parallel to the second material layer, and passing a third portion of the second interlayer reinforcements pass through the second material layer and then the third material layer.