Patent ID: 8652602
Filing Date: 2014-02-18
Classification: B29C,B29K,Y10T

Abstract:
1. An auxetic structure formed from a plurality of x-axis strands and y-axis strands wherein each of said x-axis strands comprises a wave pattern oscillating about an axis extending in parallel relation to an x-axis and each of said y-axis strands comprises a wave pattern oscillating abut an axis extending in parallel relation to a y-axis; the wave pattern of each x-axis strand is offset from the wave pattern of each adjacent x-axis strand by 180 degrees and the wave pattern of each y-axis strand is offset from the wave pattern of each adjacent y-axis strand by 180 degrees; said x-axis strands and said y-axis strands being joined together at nodes where said x-axis strands and said y-axis strands intersect, and wherein an x-axis sub-unit cell segment comprising a portion of said x-axis strand of ½ a wavelength and a y-axis sub-unit cell segment comprising a portion of said y-axis strand of ½ a wavelength extend through each joint to form a sub-unit cell and wherein each sub unit cell is a mirror image of each adjacent sub-unit cell both across axis extending parallel to the x-axis and across axis extending parallel to the y-axis; wherein at least one x-axis flex point is formed on each of said x-axis strands between adjacent x-axis sub-unit cell segments and said x-axis flex points are more flexible than said nodes; and wherein at least one y-axis flex point is formed on each of said x-axis strands between adjacent y-axis sub unit cell segments and said y-axis flex points are more flexible than said nodes.