magi0046
Mechanical
- Apr 14, 2014
- 1
Dear all,
I have imported the femur and pelvis together with the articular cartilages of each on Ansys APDL as PARASOLID format.
Bones were meshed using Solid187 to model cortical bone and Shell181 to model trabecular bone. Cartilages were meshed using Solid187.
I have also modelled the muscles gluteus medius and gluteus minimus together with the ligament of the femur of the head using link elements; Link180.
In addition, I have used constraint equations (CE command) between the femur and its cartilage and the pelvis and its cartilage to prevent rigid body motion.
Boundary conditions were applied at the symmetrical boundary of the pelvis using a master node through the CERIG command.
A force and moment (which were calculated analytically) have been applied at the posterior end of the femur.
For the contact solution, the contact was set as the femoral cartilage (CONTA174) and target was set as the pelvic cartilage (TARGE170). Convergence was obtained; the femur experienced some rotation upwards, creating a penetration between the two cartilages.
My problem is this: I cannot plot any contact results such as; contact status, contact penetration, contact stress. When trying to plot any of these results, I obtain an error saying: "The requested CONT data is not available. The PLNSOL command is ignored."
I have tried to vary the normal stiffness coefficient, the friction coefficient, the penetration tolerance and the type of contact algorithm for the contact solution. But all yielded same results from the converged contact solution: small movement of femur and penetration of cartilages together with error message when trying to plot the contact results.
It would be helpful if someone could help me in rectifying this problem.
Thanks in advance.
I have imported the femur and pelvis together with the articular cartilages of each on Ansys APDL as PARASOLID format.
Bones were meshed using Solid187 to model cortical bone and Shell181 to model trabecular bone. Cartilages were meshed using Solid187.
I have also modelled the muscles gluteus medius and gluteus minimus together with the ligament of the femur of the head using link elements; Link180.
In addition, I have used constraint equations (CE command) between the femur and its cartilage and the pelvis and its cartilage to prevent rigid body motion.
Boundary conditions were applied at the symmetrical boundary of the pelvis using a master node through the CERIG command.
A force and moment (which were calculated analytically) have been applied at the posterior end of the femur.
For the contact solution, the contact was set as the femoral cartilage (CONTA174) and target was set as the pelvic cartilage (TARGE170). Convergence was obtained; the femur experienced some rotation upwards, creating a penetration between the two cartilages.
My problem is this: I cannot plot any contact results such as; contact status, contact penetration, contact stress. When trying to plot any of these results, I obtain an error saying: "The requested CONT data is not available. The PLNSOL command is ignored."
I have tried to vary the normal stiffness coefficient, the friction coefficient, the penetration tolerance and the type of contact algorithm for the contact solution. But all yielded same results from the converged contact solution: small movement of femur and penetration of cartilages together with error message when trying to plot the contact results.
It would be helpful if someone could help me in rectifying this problem.
Thanks in advance.
