I adjusted the FreeCAD file by decreasing the line length from 2000 to 1360, and increasing the constraint force to 44kn then saved the file which is attached.
I input the same information into an online "buckling calculator to establish the critical load:-
https://www.omnicalculator.com/physics/buckling
I took the radius of gyration from the design tables
Image attached. This returned a critical load of 342kN
I don't know if my logic is flawed but I then plugged that load into the FreeCAD file in the hope that it would come up with a critical load of 1. it came close (I think- 0.1069654E+01).
I have attached the ccx.dat output for both loads in code below: 342kn then 44kn as well as an image of the output from the online calculator.
I know that a buckling factor >1 means the member won't buckle how to make full use of this buckling factor to establish for example a safe working load? I would be grateful for such an explanation.
342Kn ccx.dat:-
Code: Select all
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
-3.142333E-10 -1.356909E-09 3.420000E+05
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
1.460439E-09 -1.588411E-09 -3.420000E+05
B U C K L I N G F A C T O R O U T P U T
MODE NO BUCKLING
FACTOR
1 0.1069654E+01
2 0.1069654E+01
E I G E N V A L U E N U M B E R 1
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
8.213051E-01 2.349412E+01 -8.630971E-10
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
-8.349449E-01 -2.388429E+01 1.132904E-09
E I G E N V A L U E N U M B E R 2
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
2.349412E+01 -8.213051E-01 8.168058E-10
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
-2.388429E+01 8.349449E-01 -1.002564E-09
Code: Select all
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
-5.487710E-11 -1.898481E-10 4.400000E+04
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
2.072651E-10 9.596235E-11 -4.400000E+04
B U C K L I N G F A C T O R O U T P U T
MODE NO BUCKLING
FACTOR
1 0.1802055E+01
2 0.1802055E+01
E I G E N V A L U E N U M B E R 1
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
1.067076E+01 -1.746170E+00 -2.360421E-09
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
1.070892E+01 -1.752415E+00 3.294811E-09
E I G E N V A L U E N U M B E R 2
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT and time 0.0000000E+00
1.746170E+00 1.067076E+01 6.471672E-09
total force (fx,fy,fz) for set CONSTRAINTDISPLACEMENT001 and time 0.0000000E+00
1.752415E+00 1.070892E+01 -8.669460E-09