文档介绍：Mechanics topic
brittle fracture of structure at low temperature
小组成员:张冰清20085379席聪聪20085360
周晓莉20085402 王伟20085396
唐伟文20085393 刘川20085394
袁鑫 20085398 谢奇峻20085399
彭鹏 20085400 董轩晨
王锡波 20085401 王洪娇20085389
Example
the sinking of Titanic
Simple introduction of Titanic
Simple introduction of Titanic
Titanic was the largest and most luxurious cruise, displacement of 4600T, known as a capital at sea. Unfortunately ,it was wrecked by its collision with an iceberg on its virgin journey from Southampton to New York.
Why would a collision with
an iceberg produced more
than 90 meters long
large crack?
?
Solution
4
Study
1
Experimental result
2
Enlightenment
3
Main content
Study
The properties of steel at low temperature
Composition of the steel
The temperature of the seawater
Experimental result
Fracture property of steel increases with rising temperature
For the steel used for shipping,
ductile-brittle transition temperature is between 0 and 40 centigrade
1. Weld or part of its close;
2. The various kinds of stress concentration place caused by the shape of the structures;
3. The various local damage happened when the ponents in manufacturing structures .
Obviously, when stress concentration, welding defects or material defects and great residual stress bination, The risk of damage in low temperature is particularly big.
The several typical pathogenic point happened damage at low temperatures
impact test
Material used for Titanic
Material used for current ships
Enlightenment
Material Selection
Ductile-brittle transition temperature