ShaftElement 6 gdl code

[raphaeltimbo]

I am opening this issue to organize the implementation for a shaft element with 6 dof.

• [ ] Implement mass matrix without rotary inertia;
• [ ] Implement mass matrix with rotary inertia;
• [ ] Implement stiffness matrix.

[ross-bott]

Hi there! I have marked this issue as stale because it has not had activity for 45 days. Consider the following options:

• If the issue refers to a large task, break it in smaller issues that can be solved in less than 45 days;
• Label the issue as wontfix or wontfix for now and close it.

[raphaeltimbo]

502 implemented this.