The VUMAT subroutine based on progressive damage was used to introduce the Johnson-Cook model,and generate different carbon fibre reinforced polyetherether ketone(CFRP)composites through Matlab.A three-point bending finite element model was established.By analyzing the stress-strain distribution,load-displacement curve,and absorbed energy-displacement curve,it is found that adding carbon fiber effectively improves the stress-strain distribution inside the matrix polyetheretherketone(PEEK)and improves the mechanical properties,the stiffness and fracture resistance of the material.CFRP composite materials perform better during three-point bending,withstand significant plastic deformation,and effectively avoid crack expansion.In addition,under the same displacement load condition,CFRP composite materials'displacement gradually decreases as the carbon fiber contents increase.Especially in composites with carbon fiber mass fractions of 10％and 20％carbon fiber contents,the maximum displacements of the upper and lower surfaces show tortuous characteristics.Combined with the distribution of stress and strain fields,this shows that adding carbon fiber can effectively improve the stiffness and bending resistance of the material.
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