# Transcript

Narrator

If we look at the six degrees of freedom for each node on the cut face, the x-axis is aligned with the car longitudinal centre line. The y-axis goes across the car, side to side. The z-axis is vertical.

For the anti-symmetry condition, the x and z directional degrees of freedom are constrained, as is the rotational degree of freedom about the y-axis. If the loading arrangement was also symmetrical, the symmetry boundary condition would be the exact opposite – constrain y displacement, constrain the rotations about the x and z axes.