Study On The Compression Properties Of Spacer Fabric Reinforced Organic/inorganic Composites

3D spacer fabric reinforced composites is a new type of textile structure composites.The Spacer fabric as reinforcement which is shaped by one step,the yarns between the fabric layers can form a hollow structure.The 3D spacer fabric composites has preferable properties such as high-strength,thermal insulation,impact resistance,ease of designing,and outstanding integrity.In this paper,we select polyester warp knitted spacer fabric as reinforcement,fabricate spacer fabric reinforced waterborne polyurethane matrix composites by coating process,and analyze compressive deformation properties of spacer fabric reinforced resin matrix composites by static compression test and local support deformability.The hollow fiber reinforced concrete(CMC)composites were prepared with cement and mortar as the matrix,respectively.The compressive properties of the hollow concrete composites were characterized by plate compression test,and the strengthening characteristics of different matrix were studied.The research shows:The addition of waterborne polyurethane matrix can increase the slope of the plate compression load-displacement curve,increase the elastic modulus,reduce the buffer coefficient and improve the cushioning efficiency without affecting the permeability of the material.When the same deformation occurs,the load of Y-718 waterborne polyurethane matrix composites is larger than that of R-618 waterborne polyurethane matrix composites.The compressive force of pure fabric can only propagate along the surface of the fabric in a small range when the deformation of the fabric is small,and the compressive deformation of the fabric is larger.With the increase of the compressive deformation,the force value is more along the portrait of the surface layer.The force of the waterborne polyurethane-based composites can spread evenly along the surface of the material,and the distance of the propagation is far away and the bearing capacity is improved.There are no obvious stages in the compressive curves of the mortar-based hollow composites,but the cement-based composites curves are divided into three distinct stages,the platform stage is more obvious and the buffering effect of the spacer yarns last longer.The compaction stage of the mortar-based composite material occurs when the strain is between 50%and 60%,while the compaction stage of the cement-based composite material is about 40%-50%.The stress values of the two hollow composites increase with the increase of the matrix content,and still have a certain residual strength after being damaged by compression,which avoids the catastrophic damage of the building components.But the appearances of the failure of both have some differences.The surface of the cementitious composite is not cracked,but the delamination of the cement matrix and the spacer fabric appears in the edge of the material,while the fracture morphology of the mortar hollow composite is surface cracked,and the delamination of the cement matrix and the spacer fabric.