Abstract:

In order to make curved composites, this paper designed a innovative curved three-dimensional(3-D) spacer structure. First introduces a knitting technique of computer flat-knitted innovative 3-D spacer fabrics with double rib connection by using aramid fibers, then the aramid reinforcement yarns are integrated into two surface layers of 3-D spacer fabrics in the weft direction to enhance the tensile properties. By changing the weaving process, flat-knitted 3-D speacer fabrics curved in different angles(in the warp direction)were developed. Tensile tests on the universal material testing machine are carried out in the weft and warp directions of the two spacer fabrics(with reinforcement yarns and without), and their stress-strain curves are compared. The results revealed that reinforcement yarns reduced deformation, and improved tensile stress and dimensional stability of 3-D spacer fabrics when other experimental conditions being equal.