Tangential behaviour
Tangential behaviour
(OP)
Hi all,
I have some truck axle loading modelled as patch load as shown below to load a bridge. For interaction property, I used Tangential Behaviour which is affecting the results significantly.
I know that there would be some friction in reality when the vehicle tyre is on bridge (stationary not moving vehicle), how I can specify that friction here?
Results of load-displacement curve is affected by changing the Tangential behaviour, higher coefficient of friction giving much higher loading (which of course is not realistic). I've been using tangent coefficient of 0.1 for my analysis so far. I appreciate if someone give me some explanations how to specify friction for this case or if friction is needed at all.
Cheers,
I have some truck axle loading modelled as patch load as shown below to load a bridge. For interaction property, I used Tangential Behaviour which is affecting the results significantly.
I know that there would be some friction in reality when the vehicle tyre is on bridge (stationary not moving vehicle), how I can specify that friction here?
Results of load-displacement curve is affected by changing the Tangential behaviour, higher coefficient of friction giving much higher loading (which of course is not realistic). I've been using tangent coefficient of 0.1 for my analysis so far. I appreciate if someone give me some explanations how to specify friction for this case or if friction is needed at all.
Cheers,
Shoot for the Moon, even if U miss, U still land among Stars!





RE: Tangential behaviour
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Tangential behaviour
I also believe I don't need to put 'penalty' method, instead choose 'friction-less'.
Since the purpose if loading to find collapse load, the patch load is stationary and modeled as rigid body, so putting friction of 1 or higher I found that increases the total load (which is reasonable as the friction is set higher, more force needed to cause collapse).
Shoot for the Moon, even if U miss, U still land among Stars!
RE: Tangential behaviour
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Tangential behaviour
I agree with you; because the purpose is to increase a known load (in my case a truck load) until collapse occurs (based on plastic and nonlinear formulation I defined). Actually, I am getting more accurate results when friction coefficient is set to <0.3 or is set to frictionless. In the appended file, you see how load-deflection curve is affected by higher values of friction coefficient.
Shoot for the Moon, even if U miss, U still land among Stars!