Experimental and numerical research of temperature on tensile properties of multiaxial warp‐knitted composites

Abstract A study on tensile behavior of composites reinforced with triaxial and quadriaxial warp‐knitted glass fabrics were carried out in 0°, 45°, and 90° directions at temperature of −30°C, 0°C, 20°C, and 40°C. The stress‐strain character, normalized strength, normalized modulus, failure strain, and the relationships between strength and temperature were also obtained. The failure mechanism was also analyzed based on the fracture mode and scanning electron microscopy morphology of composites. In addition, to obtain influence related with reinforcement structure, the tensile behavior of the quadriaxial warp‐knitted composite was simulated on the basis of unit cell model and compared with the experimental one. Results show that the tensile properties were decreased with the increase of temperature. The ultimate normalized strength of triaxial and quadriaxial warp‐knitted composites were decreased by 14.18% and 18.13%. The fracture morphology was consistent with the simulation ones.