Research on damage and failure mechanism and model of 3D printed cfrp layer by fused filament fabrication
In order to apply 3D printing technology to bridge engineering,the basic research work on the mechanism of damage and failure within the material layer was carried out,with the manufacturing of 3D printed carbon fiber composite anchor rings using fuse as the research object.Firstly,tensile anchorage failure test was carried out to clarify the damage failure mode of the anchor ring.Secondly,the elastic parameters and strength parameters of the material are tested and used for subsequent simulation analysis.Finally,the damage failure constitutive relationship of the material was constructed by VUMAT subroutine,and the whole process of progressive damage failure of the 3D-printed carbon fiber reinforced plastic anchor ring was simulated by ABAQUS simulation analysis software,and the damage failure mechanism in the layer was analyzed.The results show that the intra damage of 3D printed carbon fiber reinforced plastic manufactured by fuse is significant.The use of Hashin damage initiation criterion and stiffness instantaneous degradation model as the damage mechanical model of 3D printing carbon fiber reinforced plastic is safe and feasible.The longitudinal cracks in the height direction of the anchor ring are caused by fiber tensile failure.
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