Stretchable surfaces with programmable texture
The present disclosure may be embodied as a method for creating a restriction pattern from a mask material having a strain (ε mask ) an for mapping elastomeric membrane having a strain (ε membrane ) into a target 3D shape. The method may include discretizing the target 3D shape into a plurality of radial segments, and a radial strain (ε r ) is determined for each radial position (r) on each radial segment of the plurality of radial segments. A restriction pattern is determined, wherein the restriction pattern comprises a quantity of mask material for each position r to provide a composite strain (ε mask , ε silicone ). In some embodiments, the method further includes depositing a first membrane layer into a mold and placing mask material into the first membrane layer according to the determined restriction pattern. The first membrane layer is cured.
1. A method for creating a mesh pattern from a mesh material having a strain (ε mask ) for mapping an elastomeric membrane having a strain (ε membrane ) into a target 3D shape, comprising:
discretizing the target 3D shape into a plurality of radial segments;
determining a radial strain (ε r ) for each radial position (r) on each radial segment of the plurality of radial segments; and
determining a mesh pattern comprising a quantity of mesh material for each position r to provide a composite strain (ε mask , ε silicone ).
2. The method of claim 1 , further comprising:
depositing a first membrane layer into a mold;
placing mesh material onto the first membrane layer according to the determined mesh pattern; and
curing the first membrane layer.
3. The method of claim 2 , further comprising depositing a second membrane layer onto the mesh material and first membrane layer.
4. The method of claim 2 , wherein placing the mesh material onto the first membrane layer further comprises:
treating the mesh material according to the mesh pattern; and
removing excess mesh material to leave the mesh pattern.
5. The method of claim 4 , wherein a laser is used to treat the mesh material.
6. The method of claim 2 , wherein
the mesh material placed onto the first membrane layer comprises a plurality of fibers, and wherein the act of placing further comprises embedding the mesh material within the first membrane layer.
7. The method of claim 6 , wherein the first membrane layer comprises silicone.
8. The method of claim 6 , wherein each fiber of the plurality of fibers is flexible.
9. The method of claim 8 , wherein each fiber in the plurality of fibers is substantially inextensible in a longitudinal direction.
10. The method of claim 6 , wherein the mesh pattern comprises a plurality of concentric rings.