this is an interesting development. the nist has released their final report showing how they think the wtc 7 collapsed. only problem is they had NO steel to analyze. its all photo/video evidence and a computer simulation. from what ive read, they havent released the "evidence" they present so we cant view the video/photos that they had access too. fema had steel to analyze and it showed some very interesting characteristics.
just wondering what people think with nist not analyzing or having access to that steel fema had access too. and how, using the scientific method, one would come to the conclusion they did NOT HAVING ANY STEEL TO ANALYZE!!!
http://www.nydailynews.com/ny_...rought_7_wtc_down.html
"Our study found that the fires in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event," said Dr. Shyam Sunder, the lead investigator on the project.
"Video and photographic evidence combined with detailed computer simulations show that neither explosives nor fuel oil fires played a role in the collapse of WTC 7."
In particular, the 77-page report concluded that a crucial steel support column was weakened.
"When this critical column buckled due to lack of floor supports, it was the first domino in the chain," said Sunder.
Sunder said his team looked for evidence of an explosion but found no signs of a large boom or other noise.
Investigators also concluded there was no evidence that the collapse was caused by fires from a substantial amount of diesel fuel that was stored in the building.
now for the fema wtc sample.
Although the exact location of this beam in the building was not known, the severe erosion found in several beams warranted further consideration.
Evidence of a severe high temperature corrosion attack on the steel, including oxidation and sulfication with subsequent intragranular melting, was readily visible in the near-surface microstructure. A liquid eutectic mixture containing primarily iron, oxygen, and sulfur formed during this hot corrosion attack on the steel. This sulfur-rich liquid penetrated preferentially down grain boundaries of the steel, severely weakening the beam and making it susceptible to erosion. The eutectic temperature for this mixture strongly suggests that the temperatures in this region of the steel beam approached 1,000 °C (1,800 °F), which is substantially lower than would be expected for melting this steel.
Summary for Sample 1
The thinning of the steel occurred by a high-temperture corrosion due to a combination of oxidation and sulfidation.
Heating of the steel into a hot corrosive environment approaching 1,000 °C (1,800 °F) results in the formation of a eutectic mixture of iron, oxygen, and sulfur that liquefied the steel.
The sulfidation attack of steel grain boundaries accelerated the corrosion and erosion of the steel.
******that steel from the fema sample could have been a contributing factor for the collapse and there is NO mention of that sample in the nist report*******
the whole nist study:
http://www.ae911truth.org/docs..._1A_for_public_comment[1].pdf
--------------------------------------
This has been discussed to death.
The explosive tin foil hat can go home; although they will not.
The missing steel is gone, and because of it, the tin foil hat crowd will have always a bone to chew on.
/update
After discussions among the Moderators, it has been decided that this will be allowed to see if maturity exists within the P&N crowd.
If it turns into a tin foil thread it will be re-locked
/Update - 9/06
This thread was supposed to be about new stuff; Everything you have presented to argue against the NIST report seems to be scientifically refuted multiple times or is based on people supposing without qualifications or true knowledge.
Everytime you put forth a theory and it gets shot down; you jump to another tangent.
Are you going to provide anything new to justify this thread being open.
If not this thread will be locked down on Monday.
Senior Anandtech Moderator
Common Courtesy
just wondering what people think with nist not analyzing or having access to that steel fema had access too. and how, using the scientific method, one would come to the conclusion they did NOT HAVING ANY STEEL TO ANALYZE!!!
http://www.nydailynews.com/ny_...rought_7_wtc_down.html
"Our study found that the fires in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event," said Dr. Shyam Sunder, the lead investigator on the project.
"Video and photographic evidence combined with detailed computer simulations show that neither explosives nor fuel oil fires played a role in the collapse of WTC 7."
In particular, the 77-page report concluded that a crucial steel support column was weakened.
"When this critical column buckled due to lack of floor supports, it was the first domino in the chain," said Sunder.
Sunder said his team looked for evidence of an explosion but found no signs of a large boom or other noise.
Investigators also concluded there was no evidence that the collapse was caused by fires from a substantial amount of diesel fuel that was stored in the building.
now for the fema wtc sample.
Although the exact location of this beam in the building was not known, the severe erosion found in several beams warranted further consideration.
Evidence of a severe high temperature corrosion attack on the steel, including oxidation and sulfication with subsequent intragranular melting, was readily visible in the near-surface microstructure. A liquid eutectic mixture containing primarily iron, oxygen, and sulfur formed during this hot corrosion attack on the steel. This sulfur-rich liquid penetrated preferentially down grain boundaries of the steel, severely weakening the beam and making it susceptible to erosion. The eutectic temperature for this mixture strongly suggests that the temperatures in this region of the steel beam approached 1,000 °C (1,800 °F), which is substantially lower than would be expected for melting this steel.
Summary for Sample 1
The thinning of the steel occurred by a high-temperture corrosion due to a combination of oxidation and sulfidation.
Heating of the steel into a hot corrosive environment approaching 1,000 °C (1,800 °F) results in the formation of a eutectic mixture of iron, oxygen, and sulfur that liquefied the steel.
The sulfidation attack of steel grain boundaries accelerated the corrosion and erosion of the steel.
******that steel from the fema sample could have been a contributing factor for the collapse and there is NO mention of that sample in the nist report*******
the whole nist study:
http://www.ae911truth.org/docs..._1A_for_public_comment[1].pdf
--------------------------------------
This has been discussed to death.
The explosive tin foil hat can go home; although they will not.
The missing steel is gone, and because of it, the tin foil hat crowd will have always a bone to chew on.
/update
After discussions among the Moderators, it has been decided that this will be allowed to see if maturity exists within the P&N crowd.
If it turns into a tin foil thread it will be re-locked
/Update - 9/06
This thread was supposed to be about new stuff; Everything you have presented to argue against the NIST report seems to be scientifically refuted multiple times or is based on people supposing without qualifications or true knowledge.
Everytime you put forth a theory and it gets shot down; you jump to another tangent.
Are you going to provide anything new to justify this thread being open.
If not this thread will be locked down on Monday.
Senior Anandtech Moderator
Common Courtesy