Abstract: An auxetic member for load bearing structures has a section including a plurality of structural units, and a top layer provided at a top end of the section and a bottom layer provided at a bottom end of the section. The structural units includes ribs with parallel surfaces and ribs with re-entrant surfaces and the ribs with parallel surfaces of the structural units are oriented at an angle ? relative to a horizontal plane, the structural unit including a void enclosed by the ribs with parallel surfaces and ribs with re-entrant surfaces. The member is characterized in that the void of the structural units is filled with a packing material for improving load bearing capacity.

Abstract: An auxetic member for load bearing structures has a section including a plurality of structural units, and a top layer provided at a top end of the section and a bottom layer provided at a bottom end of the section. The structural units includes ribs with parallel surfaces and ribs with re-entrant surfaces and the ribs with parallel surfaces of the structural units are oriented at an angle a relative to a horizontal plane, the structural unit including a void enclosed by the ribs with parallel surfaces and ribs with re-entrant surfaces. The member is characterized in that the void of the structural units is filled with a packing material for improving load bearing capacity.

Abstract: The invention in its various embodiments discloses a structural member designed for improved load bearing using auxetic expandable-collapsible structural units. The auxetic structural units may have parallel-sided surfaces oriented at an angle (?) to the horizontal direction. In some embodiments the angle varies between 40-140 degree within a layer. The structural member may include at least two layers having identical structural units, the layers varying in orientation ? of the structural units, or material or wall thickness thereof. In various embodiments, the angular orientation ? may be the same in alternate layers. The structural member provides load bearing capacity of a solid component at 30-40% of material weight. The invention discloses an optimized structure with structural units oriented alternately at ? values of 45° or 135° .