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Quote:
Adding to the problem, in buying iron for the Titanic’s rivets, the company ordered No. 3 bar, known as “best” — not No. 4, known as “best-best,” the scientists found. Shipbuilders of the day typically used No. 4 iron for anchors, chains and rivets, they discovered. So the liner, whose name was meant to be synonymous with opulence, in at least one instance relied on cheaper materials. Many of the rivets studied by the scientists — recovered from the Titanic’s resting place two miles down in the North Atlantic by divers over two decades — were found to be riddled with high concentrations of slag. A glassy residue of smelting, slag can make rivets brittle and prone to fracture. Photographs of Titanic's sister ship, the RMS Olympic, back up the rivet failure theory. Taken after the Olympic collided with another vessel in 1911, the photos clearly show dozens of vacant holes in the hull where rivets once sat. Sonar and other evidence gathered during a 1996 visit to the Titanic also point to seam and rivet failure. There quite a good article here:- http://www.nytimes.com/2008/04/15/sc...pagewanted=all |
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The theory about the rivets, and remember its only a theory as the thing is over 2 miles down, (though they have recovered rivets and done metelurgical tests on them),
is that that as the ship was sinking, the pressure built up on the hull in excess to what it was designed to take. This in turn put pressure on the rivets which were brittle, due to their poor quality to start with, and became increasingly brittle due to the cold. The rivets broke, opening up a bigger breach in the hull allowing more water in. Things to factor in: The quality of the rivets are poor to the standards of the 21st century. They were the best that could be manufactured in 1912. No body knows precisely how much damage and where the iceberg damaged the hull as that part is burried in meters of mud on the ocean floor. Some historians have put forward a theory that had the damage been caused by the berg alone, the Titanic may have stayed afloat longer than it did. The "rivet theory" may have exacerbated the damage caused by the initial collision. Also remeber, until recently it was widely believed the iceberg caused one great long rupture in the hull, and until the wreck was discovered, most people believed in sank in one piece. |
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Very nice piece of writing.
The disaster of the Titanic is purely human, not technological. Overconfidence. How many big armies and even countries ran into disaster believing it would be an easy victory. The moment you think you are invincible you are at your weakest. I'm planning to travel to the US by ship next year or in two years. Only the Queen Mary 2 sailes to New York. Two times a year. I'll take the trip in the first half of the year, because in the second half the Atlantic is very rough. I get seasick the moment I set foot on a ship. The reason I want to go by ship is because I want to be on deck when the ship enters the harbor of New York. I will have approx the same view as the many immigrants had 100 years ago. If my information is right, they still follow the same route to the harbor of New York. |
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The rivets used in Titanic and Olympic were what they called number 3 graded "best" rivets and not number 4 "best best" rivets that should have been used.
Theories about shoddy rivets popping prematurely after the ship struck an iceberg have been around for years; officials at Harland & Wolff have consistently dismissed them. But this time the authors, both metallurgists, say they have found fresh evidence from archives in London and from the shipyard as well as from analysing rivets from the wreck. By the first part of the last century, other shipyards had mostly already switched to all-steel rivets. Although steel was used for the central sections of hull of the Titanic, the design called for iron rivets for bow and aft sections. Most of the cracks that opened after its collision with the iceberg were in the iron-riveted forward part of the hull. It appears that the yard, unable to find all the best-quality rivets needed, made of so-called No 4 bar, eventually settled on some rivets of No 3 bar, which is considered inferior because of greater levels of impurities, notably of slag. Quote:
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