Footwear midsole with anisotropic mesh and methods of making the same
Soles for articles of footwear including a mechanically anisotropic three-dimensional mesh. The mechanically anisotropic three-dimensional mesh can include one or more mechanically anisotropic regions with a first lattice shear modulus measured in a first direction and a second lattice shear modulus measured in a second direction opposite to or orthogonal to the first direction. The first and second lattice shear moduli are different to provide the three-dimensional mesh with mechanically anisotropic properties. The mechanically anisotropic three-dimensional mesh can be three-dimensionally printed.
1. A sole for an article of footwear, the sole comprising:
a three-dimensional mesh comprising:
a plurality of interconnected unit cells, each interconnected unit cell comprising struts defining a three-dimensional shape and a plurality of nodes at which one or more of the struts are connected; and
a mechanically anisotropic region comprising: a first lattice shear modulus measured in a first direction, and a second lattice shear modulus different from the first lattice shear modulus and measured in a second direction opposite to or orthogonal to the first direction, and
wherein the struts of each of a plurality of the interconnected unit cells in the mechanically anisotropic region comprise one or more first struts comprising a strut characteristic that is different from the strut characteristic of one or more second struts in the unit cell.
2. The sole of claim 1 , wherein the second lattice shear modulus is greater than the first lattice shear modulus.
3. The sole of claim 1 , wherein the second lattice shear modulus is at least 10% greater than the first lattice shear modulus.
4. The sole of claim 1 , wherein the second lattice shear modulus is greater than the first lattice shear modulus by 10% to 500%.
5. The sole of claim 1 , wherein the first direction is a forward direction pointing away from a heel end of the sole, and
wherein the second direction is a rearward direction pointing toward the heel end of the sole.
6. The sole of claim 1 , wherein the first direction is a medial direction pointing away from a lateral side of the sole, and
wherein the second direction is a lateral direction pointing toward the lateral side of the sole.
7. The sole of claim 1 , wherein the first direction is a longitudinal direction extending between a heel end and a forefoot end of the sole, and
wherein the second direction is a transverse direction extending between a medial side and a lateral side of the sole.
8. The sole of claim 1 , wherein the strut characteristic is selected from the group consisting of: an effective diameter, a cross-sectional shape, a compressive strength, a bend strength, and a combination thereof.
9. The sole of claim 8 , wherein the strut characteristic is effective diameter,
wherein the one or more first struts comprise a first effective diameter, and
wherein the one or more second struts comprise a second effective diameter different from the first effective diameter.
10. The sole of claim 9 , wherein the one or more first struts are forwardly-oriented and the one or more second struts are rearwardly-oriented.
11. The sole of claim 9 , wherein the one or more first struts are medially-oriented and the one or more second struts are laterally-oriented.
12. The sole of claim 9 , wherein the first effective diameter is different from the second effective diameter by at least 10%.
13. The sole of claim 8 , wherein the strut characteristic is cross-sectional shape,
wherein the one or more first struts comprise a first cross-sectional shape, and
wherein the one or more second struts comprise a second cross-sectional shape different from the first cross-sectional shape.
14. The sole of claim 13 , wherein the one or more first struts are forwardly-oriented and the one or more second struts are rearwardly-oriented.
15. The sole of claim 13 , wherein the one or more first struts are medially-oriented and the one or more second struts are laterally-oriented.
16. The sole of claim 1 , further comprising a second mechanically anisotropic region comprising:
a third lattice shear modulus measured in the first direction, and
a fourth lattice shear modulus different from the third lattice shear modulus and measured in the second direction, and
wherein the struts of each one of the plurality of interconnected unit cells in the second mechanically anisotropic region comprise one or more first struts comprising a strut characteristic that is different from the strut characteristic of one or more second struts in the unit cell.
17. The sole of claim 16 , wherein the fourth lattice shear modulus is at least 10% greater than the third lattice shear modulus.
18. The sole of claim 1 , wherein the mechanically anisotropic region is predisposed to deform towards a forefoot end of the sole when a downward vertical load is applied to a top side of the mechanically anisotropic region.
19. The sole of claim 1 , wherein the mechanically anisotropic region comprises a 7×7×2 group of the interconnected unit cells, and the second lattice shear modulus is at least 10% greater than the first lattice shear modulus.
20. A method of making a sole for an article of footwear, the method comprising:
3-D printing a three-dimensional mesh for the sole comprising a plurality of interconnected unit cells, each interconnected unit cell comprising struts defining a three-dimensional shape and a plurality of nodes at which one or more of the struts are connected,
wherein 3-D printing the three-dimensional mesh comprises printing a set of the interconnected unit cells to define a mechanically anisotropic region comprising anisotropic lattice shear moduli comprising a first lattice shear modulus measured in a first direction, and a second lattice shear modulus different from the first lattice shear modulus and measured in a second direction opposite to or orthogonal to the first direction, and
wherein the struts of each of a plurality of the interconnected unit cells in the mechanically anisotropic region comprise one or more first struts comprising a strut characteristic that is different from the strut characteristic of one or more second struts in the unit cell.
21. The method of claim 20 , further comprising collecting biometric data, the biometric data comprising a map of stresses comprising a first zone having a first average vertical load and a second zone having a second average vertical load less than the first average vertical load,
wherein 3-D printing the three-dimensional mesh comprises printing the set of interconnected unit cells in a first location of the three-dimensional mesh corresponding to the first zone in the map of stresses.