CHINA TEXTILE LEADER

Home

Static Mechanical Properties of Pultruded Carbon Fiber Reinforced Composites at Room Temperature

2022年11月11日

Abstract: In order to improve the mechanical properties and designability of carbon fiber materials furtherly, carbon fiber fabric reinforced epoxy composites were prepared by the pultrusion process with four axial carbon fiber warp-knitted fabric and epoxy resin as raw materials. The tensile properties, compressive properties and fracture toughness of the material were studied by static strength test, and the cross-section of the material was observed by an electron scanning microscope to further explore the damage mechanism of the material. The study showed the following results. Firstly, the tensile strength of the opening is 512 MPa, the crack expands from the opening, the fiber carries the main destructive force, and the fiber pullout and matrix damage are less. Secondly, the compressive strength of the opening is 270 MPa. On the macro level, 45?°cracks along the thickness are consistent with the direction of the inner ply, mainly shear failure.On the micro level, complex interlayer delamination, matrix fracture, and several fiber pull-outs are shown, accompanied by fiber fracture of uneven length. And both fibers and matrix are damaged. In the end, the fracture toughness performed well with 70.5 MPa?m1/2 of the fracture toughness coefficient. It has obvious delamination damage on the surface.

Key words: pultrusion forming; carbon fiber reinforced composites; invalid; opening stretching; opening compression; fracture toughness