الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 137 |  |  |
| | | from | 137 | | |
Abstract
-Egyptian U-bolt material in the as received condition has lower ductility than that for both Indian and Yugoslavian U-bolt material. This leads to lower estimated fracture toughness.
-The mechanical properties of the U-bolt made in Egypt improved by using processes annealing at 450 C. Specifically for U-bolt made in Egypt as received =27.23 , after process annealing , increased to 59.35
-Processes annealing 450 C, 1h, air-cooling for as received Egyptian U- bolt increased ductility that leads to improving of fracture toughness near that for the other imported U-bolt materials.
-As a result of process annealing on the received Egyptian U-bolt, the fracture resistance increased, leading to a raise, in its fatigue life to be very close to these the imported U-bolt.
-The received process annealing for Egyptian U-bolt could decrease the fatigue crack propagation during duty which leads to pro-longed life and can be safely used.
-The fatigue life of the U-bolt made in Egypt is improved by using processes annealing, such as ( ) for U-bolt made in Egypt as received = cycle, after process annealing ( ), increased to. Cycle