Need help with CBUSH Stiffness values
Need help with CBUSH Stiffness values
(OP)
Hi All,
I am a fairly new to fea and have a question regarding CBUSH elements.
I am trying to model CBUSH elements to represent an M3 fastener which bolts 2 mounting holes of an angeled bracket to a surface.
What stiffness value do I use and in what in What DOF?
DO I use K = AE/L for stiffness calculations?
where A = pi*d^2/4 (where I took D to be 2.9 mm for M3)
I got A=6.6e-6
E = 1.8e8 Pa
L = .008m
I get K = 147689.4
my DOF would be fixed in 12345 and not in z since the fastener can rotate around that axis?
^^^ not sure if this is correct...
Thank you
I am a fairly new to fea and have a question regarding CBUSH elements.
I am trying to model CBUSH elements to represent an M3 fastener which bolts 2 mounting holes of an angeled bracket to a surface.
What stiffness value do I use and in what in What DOF?
DO I use K = AE/L for stiffness calculations?
where A = pi*d^2/4 (where I took D to be 2.9 mm for M3)
I got A=6.6e-6
E = 1.8e8 Pa
L = .008m
I get K = 147689.4
my DOF would be fixed in 12345 and not in z since the fastener can rotate around that axis?
^^^ not sure if this is correct...
Thank you





RE: Need help with CBUSH Stiffness values
For bolt I use a High stiffness in the three traslattion direction (Like 1E6) and a low value in the three rotation direcction (like 10000).
Remember to joint cbush with coincident nodes if you want to quantify force in bolts.
bye
RE: Need help with CBUSH Stiffness values
another day in paradise, or is paradise one day closer ?