Abstract: For comparing the tensile behavior of biaxial warp-knitted and 3D orthogonal woven composite along to 0° direction and 90° direction, two kinds of composites which were reinforced with 0°/90° biaxial warp-knitted glass fabric, 3D orthogonal woven fabric and the mixture of epoxy(E-2511)and curing (2511-1BT) were manufactured by means of VARTM (vacuum assisted resin transfer molding), respectively. The mechanical behavior of specimens along to 0° direction and 90° direction were experimentally executed. The result shows that the tensile strength and specific strength of biaxial warp-knitted composite along to 0° direction were a little higher than those of the 3D orthogonal woven composite. However, the elastic modulus and specific modulus were weaker than those of the 3D orthogonal woven composite. These were closely related with the effect of yarn count and weaving density of the reinforcement in composite. The tensile fracture morphologies of composites show that the tensile laminates failure, yarn pull-out and debonding of fibers in cross section of 3D orthogonal woven composite material have been significantly improved compared with the biaxial warp-knitted composite since the role of Z yarn.

Key words: biaxial warp-knitted fabric, 3D orthogonal woven fabric, tensile behavior, stress-strain