Step[@name='Step01']/Constraints/rigid_body[@mat='1']/prescribed[@bc='Rx']
factor
1.0,0.25:0.25:0.75
Material/material[@name='tibia']/center_of_mass
relative
(-0.1:0.1:0.1,-0.1,-0.1),(0.0,0.0,0.0),(-0.1,-0.1,-0.1)
Discrete/spring/E
factor
0.5