Mechanical properties of lightweight 3D warp spacer composites
3D spacer fabrics are combined with lightweight polyurethane to prepare 3D warp knitted spacer fabric composites.The three-point bending test of 3D spacer fabric composites with different matrix densities and reinforcement specifications is carried out to study the influence of their structural parameters on force and displacement curves.And its impact resistance is evaluated,and the factors affecting the impact protection performance of composite materials are obtained.The results show that the matrix density affects the mechanical properties of the three-dimensional spacer fabric composite,and the greater the matrix density,the smaller the bending stress,the weaker the bending resistance,the lower the plasticity and the worse the flexibility of the 3D warp knitted spacer fabric composite.The absorbed impact force gradually decreases,resulting in poor impact recovery of the composite.
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