Based on the meso-structure of prefabricated member of 3D four-directional braided composites

the helix geometry model was presented.According to the unit cell model

the longitudinal tensile stress-strain relationships are obtained through a finite multiphase element numerical method(FMEM).The stress fields in a unit cell are obtained.The numerical calculations of the helix geometry model agree well with the experiment data.The calculated results demonstrate that the unit cell model fits in with the practic...