damyan66
Bioengineer
- Jun 2, 2020
- 2
Hello everyone,
I am currently carrying out a university project in which I am trying to model a ski pole shaft being eccentrically loaded. The shaft is a hollow cylinder of dimensions:
inner radius = 8mm
outer radius = 9mm
length = 100cm
I am using MSC Marc Mentat software to load the cylinder eccentrically, at a distance of 50mm from the centre axis. However, the deflection I get from my FEA is 6.8mm, compared to 1.65mm when using the formula for eccentrically loaded columns, below:
deflection = e[sec((L/2)*(P/EI)^0.5)-1]
where e = eccentricity, L = length, P = force applied, E = Young's mod, I = second moment of area.
In my case, e = 0.05m, L = 1m, P = 100N, E = 200GPa, I = 1.94E-9m^4.
I have applied the eccentricity by connecting infinitely stiff beam elements from a node, 50mm away from the centre axis, to each top node on the left half of the cylinder. The bottom of the cylinder is fixed in all directions.
Screenshots of setup and results:
Link
Any help appreciated!
I am currently carrying out a university project in which I am trying to model a ski pole shaft being eccentrically loaded. The shaft is a hollow cylinder of dimensions:
inner radius = 8mm
outer radius = 9mm
length = 100cm
I am using MSC Marc Mentat software to load the cylinder eccentrically, at a distance of 50mm from the centre axis. However, the deflection I get from my FEA is 6.8mm, compared to 1.65mm when using the formula for eccentrically loaded columns, below:
deflection = e[sec((L/2)*(P/EI)^0.5)-1]
where e = eccentricity, L = length, P = force applied, E = Young's mod, I = second moment of area.
In my case, e = 0.05m, L = 1m, P = 100N, E = 200GPa, I = 1.94E-9m^4.
I have applied the eccentricity by connecting infinitely stiff beam elements from a node, 50mm away from the centre axis, to each top node on the left half of the cylinder. The bottom of the cylinder is fixed in all directions.
Screenshots of setup and results:
Link
Any help appreciated!