Hello,

I am trying to simulate a fiber-reinforced composite material in Abaqus. The object in question is a rubber tube with an embedded fabric 'jacket' (schematic shown) which is then pressurized, however for simplicity it can be approximated as a homogenous material. The tube is symmetrical so I want to use an axisymmetric model for the simulation (image attached).

The Holzapfel model appears to be an ideal candidate for this simulation as you can specify multiple 'families' of fibers in different directions. In this case there are two families of fibers: one in the longitudinal direction (up/down in the image) and one in the circumferential direction (into the plane of the image). However, in my axisymmetric model I can't seem to figure out how to input the family of fibers in the circumferential direction. Is it possible to do?

If so, this is what I tried:

*Orientation, name=Ori-1, system=cylindrical, local directions=2
0.0,0.0,0.0,0.0,1.0,0.0
3,0.0
0.0, 0.0, 1
0.0, 1, 0.0

If I'm reading the documentation correctly, I have to specify two points on the polar axis ((0,0,0) and (0,1,0) because the tube is centered on the global y-axis) and then the last two lines are the directions of the fiber families (so, fully longitudinal and fully circumferential). However, I'm getting a fatal error so clearly I am doing something wrong.

Any help is appreciated... thank you