Thanks for the information. The actual application has to do with the locking of a catheter around a guidewire that is run through the internal lumen of a flexible tube. When a balloon catheter is inflated to pressures of 300 psi, the inner tubing tends to collapse around the guidewire and...
My e-mail address is dder@guidant.com. There is another formula by Timoshenko that is being looked at as well. I understand that these are the formulas for calculating the force at which buckling occurs, but isn't hoop stress still a fairly valid indicator as well? For instance, if a pipe...
I understand what you are saying, however I do not have access to the ASME references that you specified. Are you referring to the formula ts=d((Pc*(1-ucul))/2Ec)^1/3 for pipe collapse under external pressure? I am actually an engineer that works with medical devices and I am trying to...
I am interested in know what calculations are used to calculate the collapse stress of cylindrical thin walled tubes. E-funda indicated the hoop stress calculation and that it would yield a negative stress if external pressures are applied, but I am not sure this is correct. Does anyone have a...
