Composite material capable of measuring bending deformation, spring including the same, and manufacturing method thereof

A composite material capable of measuring bending deformation, the composite material comprising:

• a planar homogenous first conductive composite body that is bendable;
• a planar dielectric body that is bendable and compressible;
• and
• a planar homogenous second conductive composite body that is bendable,
• the composite material having a length dimension that is substantially larger than a thickness dimension, wherein the thickness of the composite material is comprised of the planar first conductive composite body, the planar dielectric body, and the planar second conductive composite body,
• wherein the first conductive composite body and the second conductive composite body are respectively stacked on and connected to both surfaces of the dielectric body,
• wherein when the composite material is bent with respect to the length dimension, the bending causes a compression of the planar dielectric body, which results in a change in capacitance between the first conductive composite body and the second conductive composite body,
• wherein the change in capacitance is substantially greater due to bending along the length dimension compared to a force applied normal to the first or second composite body,
• wherein the change in capacitance can be used to measure the bending deformation of the composite material,
• wherein heights of the first conductive composite body and the second conductive composite body from the dielectric body are different from each other,
• wherein the first conductive composite body is provided in an inner diameter direction and the second conductive composite body is provided in an outer diameter direction, and the second conductive composite body is thinner than the first conductive composite body.