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.

Temperature‐dependent interlaminar behavior of unidirectional composite laminates: Property determination and mechanism analysis

“…As previously mentioned, the crack length a can be obtained for a known load P and an open displacement δ by using Equation (10). Thus, for a given load and the corresponding displacement, the crack length can be calculated using Equation (10). In addition, the crack length can also be measured from the crack propagation gage during the experiment.…”

“…This obvious consideration points out that it is important to evaluate the delamination resistance of these materials not only in standard laboratory conditions but also under the conditions of more extreme environments. [9,10] Therefore, it is necessary to gain a comprehensive understanding of the interlaminar fracture toughness of the composite laminate when exposed to a broad range of temperatures. [11,12] Some studies have demonstrated how temperature influenced the delamination response of fiber-reinforced composite materials under different stress modes.…”

Mechanical properties of flexible composites reinforced with high-performance glass fiber multi-axial warp-knitted fabrics

“…The optimum process parameters for different 3D woven structural matrix composites were determined, and the optimum conditions were 12% hardener, 140°C curing temperature, 900 s curing time and 12 bar moulding pressure. Gao et al 18 investigated the tensile conduct of multi-axial warp-knitted composites who analyzed the impact of temperature on tensile conduct and injury mechanisms. The tensile strength decreases with increasing temperature.…”