Hybrid fiber constructions to mitigate creep in composites

A non-woven fibrous article comprising at least one ply or layer comprising substantially parallel yarns, said non-woven fibrous article being formed from a plurality of twisted, low creep yarns, said yarns comprising a twisted combination of one or more polyolefin fibers having a tenacity of about 7 g/denier or more and a tensile modulus of about 150 g/denier or more, and one or more low creep reinforcing fibers, which fibers are twisted together at a twist ratio of at least about 0.5 twists of said one or more low creep reinforcing fibers per inch of said one or more polyolefin fibers, and wherein said one or more low creep reinforcing fibers have about 3.0% or less elongation when the fiber is subjected to a stress equal to 50% of the ultimate tensile strength of the fiber for 200 hours at room temperature, as determined by the ASTM D6992 testing method.

A twisted, low creep yarn, comprising a twisted combination of one or more polyolefin fibers having a tenacity of about 7 g/denier or more and a tensile modulus of about 150 g/denier or more, and one or more low creep reinforcing fibers, which fibers are twisted together at a twist ratio of at least about 0.5 twists of said one or more low creep reinforcing fibers per inch of said one or more polyolefin fibers, and wherein said one or more low creep reinforcing fibers have about 3.0% or less elongation when the fiber is subjected to a stress equal to 50% of the ultimate tensile strength of the fiber for 200 hours at room temperature, as determined by the ASTM D6992 testing method.