Recent content by vtmike

Hi, I have a configuration in which a piece of rock is under hydrostatic pressure (see attached figure) and I'm trying to figure out what the stress on this rock will be. The boundary conditions on the Steel end plates are such that the right and left plates are restricted to move in the -ve X...

Hi, If I am calculating the percentage of a number let's say 10% of 20000 which is 18000 Then I take 20% of 18000 which is 14400 Why is this not the same as taking 30% of 20000? When I take 30% of 20000 I get 14000. Why is there is a difference of 400? Thanks, Mike

Thanks for the input! I really appreciate it! I redid my calculations and verified them by working in metric. here they are: In English units: mass, m = 300 lbs = 300/386.4 = .7764 slug (lb-s^2/in) Hollow tube with OD = 6" & ID = 5" Initial angular velocity W1= 0 rpm Final angular...

Thanks for the reply! Yes you are right...Here is my updated calculation, mass, m = 300 lbs = 9.324 slug Hollow tube with OD = 6" & ID = 5" Initial angular velocity W1= 0 rpm Final angular velocity W2= 20rpm = 2.094 r/s Change in time, Delta t = 3sec So using, I=(m(OD^2 + ID^2))/2 =...

My problem specification is as follows: mass, m = 300 lbs Hollow tube with OD = 6" & ID = 5" Initial angular velocity W1= 0 rpm Final angular velocity W2= 20rpm Change in time, Delta t = 3sec So using, I=(m(OD^2 + ID^2))/2 = 9160 lb-in^2 Angular acceleration, alpha = (W2-W1)/delta t...

Hi, I am stuck on what should be a fairly simple problem. I need to calculate the torque required to rotate a pipe weighing 30 lbs resting on bearings at constant speed. How should my approach be? Do I need to actually measure the torque required using a sensor? Thanks, Mike

Hi, I know the following properties for steel, Tensile Strength = 135000 psi Yield Strength = 130000 psi Elongation in 2 inches = 16% minimum Reduction in Area = 50% minimum Hardness (Rockwell C) = 29 - 34Rc So from above properties I need to calculate the Elastic modulus & Poisson's...