In the previous response. R.d.735. wants us to discuss micro cracks. That Micro-cracks are a factor. That e=stressX strain. R.d.735 makes a hudge unanswerable leap by blaming micro-cracks for some pulverizing of concrete. Micro-cracks do not contribute to the mass of pulverizing concrete caused by the explosives. Despite the fact that none of this is at all relevant to the material we should be answering too.
 Originally Posted by r.d.735
Meanwhile, the downward compressive force on angled planes(caused by cracks) in the material creates a massive horizontal force that rapidly pushes material away and pulverizes some more material.
This is so silly as to be embarassing to clarify. The downward compressive force caused by impact does not create consistient horizontal outward force on each level that rapidly pushes away. Nor do any cracks of impact contribute largely or significantly to any polverization of material. As boring and irrelevant as this is to the subject. I would not care to agree or disagree with this mirco crack impact angled nonsense. A silly fantasy substitude for the explosives. Not educational. But brainwashing for those foolish enough to be dazed into the latest excuse.
 Originally Posted by r.d.735
Concrete has little tensile strength because a non-compressive stress causes a great amount of strain. Thus, the energy equation quickly reaches the critical threshold with much less force applied. Metals can absorb a much greater amount of energy before failing, but the ease with which they deform does not lend them to supporting the same large loads that concrete can.
NOT relevant, nor important. But distracting. Yet this set of instructions about the nature of steel and metal allows R.d.735 to create an illusion of special artifical weakness by the tendancy of association. What is not mentioned is the impossibility of the structure to fail at all due to metal not getting weak from jet fuel. And no major infrastructural damage to the buildings. IN effect no-where near enough to cause a collapse in an hour. This significant point is always ignored.
 Originally Posted by r.d.735
As I stated before, the WTC towers were held up mainly by steel supports. Therefore, one could reasonably expect that, no matter the mechanism of collapse, any concrete in the structure would be subjected to enormous compressive stresses, causing failure, and, to a casual observer, to explode outward.
Now we are suppose to associate compressive stress with failure. And you have sold your excuse. But no you havn't sold it yet. Because it doesn't make sense. The steel structure of the building was grided. Which means the plane was a pencil prick in the grid. Resulting in little 'compressive stress' to contribute to any collapse at all. The building was structured to equalize stress in any portion of a damaged area. Which is exactly what would have happened. Had the Thermate, and basement explosions not being utilized to bring the building down in a spectacular manner. Had most of the evidence not being illegally taken away immediately. This event would be well and truly assured as the case. However enough physical evidence and witnesses is left to conclude this is what happened anyway.
 Originally Posted by r.d.735
It's probably redundant to point out, but many materials make a sound not unlike an explosion when they break. These observations are thus explained without regard to the cause of collapse.
No because you say it sounds like an explosion when it breaks. Does not explain anything. It is silly. It is pointless. It is irrelevant.
 Originally Posted by r.d.735
I apologize for the lengthy, boring, tautological argument that this has been, I hope it's been educational at least.
This has taken up more time than I would like, responding to the irrelevance. I don't know why you still think 911 is not suspicious. You must be psychotic, at the least.
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