*FIxR r11, r12, r13, r14, i11, i12, i13, i14 r21, r22, r23, r24, i21, i22, i23, i24 ...
r11: r*8: min x-coordinate
r12: r*8: max x-coordinate
r13: r*8: min y-coordinate
r14: r*8: max y-coordinate
i11: i*4: x-coordinate [0 for free, 1 for fixed]
i12: i*4: y-coordinate [0 for free, 1 for fixed]
i13: i*4: z-coordinate [0 for free, 1 for fixed]
i14: i*4: load case number
This card is similar to *FIXR and *FIXC. However, it offers more flexibility to specify which degree of freedom is fixed. It also allows specification of load case number.
Best practices
Using *FIxR allows for greater control than *FIXR and *FIXC and is less prone to overconstrain the part, which may produce erroneous results. Ensure that when using *FIxR that six degrees of freedom are restrained. Fewer than 6 restrained DOF allows bulk motion of the component during simulation, while using more than 6 DOF over-constrains the part, which may incur erroneous simulations of distortion and stress. As of this version there is no warning given when under- or over-constraining the simulated part.