Date: May 29, 2018 01:10PM
Steve Clayton Wrote:
> "The causeway’s surface will also be of concern
> due to the fact that the Hertzian contact between
> the barge and the causeway will produce heat and
> material degradation on both sides."
Steve, Hertzian contact stress typically occurs between curved elastic surfaces that have a high psi interface.
Your model uses flat, not curved, interface surfaces, and the psi (less than 3.0 psi for the barge size you specified) is significantly below that which has been shown to cause surface degradation (greater than 7.0 to 14 psi psi).
Fabio is not addressing my specific questions, in a clear and concise manner. I have already told him, that moving on to stress testing, without finding a balanced system on the causeway is pointless. I specifically asked him, how much water weight would it require, to pull 20,000 lbs. up a 4.6 degree angled causeway. He never specifically answered me, other than wanting to do a stress analysis. He provided examples, thou no percentage of mechanical advantage, that the 4.6 degree incline plain provides. I know you have. 86% - cof .08. Correct? To say there is no mechanical advantage on an incline, is inaccurate.
What are we saying here? The friction is so great, that any amount of a counter weight, is useless? It's OK to pull with 40 men up dirt ramps, thou using the causeway and/or making a 180 degree rope turn is out of the question. We have always said that men could assist by pulling and/or controlling the counterweight by using gravity to their advantage.
In this new movie, Secrets of the Lost, Mark Lehner uses 40 men to attempt to pull 1 stone in the sand up a slight incline. The rope breaks. So, they use wood runners. Wood runners which support the 5,000 lb. stone. Even then, they are required to use rollers, and they eventually move approximately 30 feet, after continually adjusting the rollers, and then celebrate. OMG... this is how the pyramids were built? And now we are going up steeper ramps in a spiral circle, which is approx. 1 mile long. Additionally, he estimates 2,000 men helped build the Pyramid. Really? 2,000 men divided by 40 men per stone = 50. Once a team of 40 men reach the top, they need to make their way down off the Pyramid ramp. Half of those 50 teams, are walking back downhill. So, 25 teams are only able to pull stones in the dirt up a steeper grade 1 mile long. How does that work? Also, I would like to point out that 40 men on average occupy approx. 60 feet on each side. That 120 feet of rope per team. 50 such teams = 6,000 ft. of rope. The causeway would only require approx. 4,000 feet, up and back down provided the 2" rope is the same. Thou the causeway only delivers stones to the base, it shows there is no rope savings in using men to pull stones. We still have 2,000 feet left over to work with.
I have decided to enlist another Mechanical Engineer. I need to determine if he will answer my specific question. It could be, I am at fault, for not structuring my questions better.
The Quest continues.
Edited 1 time(s). Last edit at 29-May-18 15:12 by Steve Clayton.