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The energy degrader is the most fragile part of the security of a target, has been newly designed to improve the performance of the gas target. Also, the numerical analysis of the heat movement and mechanical movement during the operation of the target has been accomplished. The heat analysis and structure analysis which are using the cooling water flow and pressure in the energy degrader and the finite element analysis program, has been considered with the heat movement and mechanical movement according to the current capacity of proton beam which determines the production yield of the radioactive isotope. Also the possible use range has been determined and at the same time the most suitable running condition according to the current capacity of proton beam has been suggested.
In this study, geometric shape and crack in welded interface of the air cooled heat exchanger Fin-Tube was analysed. The object of study is to give insight for understanding the behavior of Stress Intensity Factor for fin length, flash thickness, flash length, symmetric and asymmetric cracks of fin producing in manufactural processed. Stress Intensity Factor was analysed by BEM. Kelvin's solution was used as a fundamental solution in BEM analysis and displacement extrapolation method was used to determine Stress Intensity Factor.
This study was performed to investigate the effect of defect. on fatigue strength under the stress of rotary bending. The specimens were made of low carbon steel having artificial microholes, namely, single micro-hole and two adjacent micro-holes as natural deffects, and the effects of the diameter of hole and the distance between the holes on fatigue strength have been investigated.<br/> The obtained result can be summarized as follows;<br/> 1. The critical defect means the largest size of deffect that does not affect fatigue limit, and correspondes to the size of defect leading to final fracture under fatigue limit of smooth specimen. The size of defect which has an effect on fatigue limit is larger than that of critical defect.<br/> 2. The defect larger than the critical defect affects fatigue strength for as a kind of size effect, and the physical meaning of size effect of defect is considered same as the one of notch effect.
This study is very important to define the characteristic of thermal fatigue for tungsten filament in the view of micro-order scale. As the result of this study about thermal fatigue for tungsten fIlament, An empirical formula, such as V=30.20- 3.59logN, is made from the relation between change of voltage and number of cycle. New fracture mechanism of thermal fatigue is suggested for tungsten filament's fractography.
WC-12%Co and SCM440 were jointed by brazing method and they were heated until 1100 CO. However, while they were cooled, the residual stress was remained because of different thermal expansion coefficient a .<br/> Therefore, the residual stress makes stress singularity on the brazing joint surfaces and these stresses are one of the reasons to make fracture conditions. The object of study is to measure the residual thermal stress by using X-Ray method and to suggest the best thickness of insert metal.<br/>
In this research, for find a stress Intensity Factor K of double surface crack, the BEM was selected. Using 3D BEM, Stress Intensity Factor of double surface crack was calculated for strength of material and its life estimation. And try to find behavior of crack growth. In this research, surface part of crack is more interfered than the deep part. And then, in the deep part, ratio of oval did not affect. In case of different size, crack growth was expected from the bigger one. As a result, we can know that size of crack affect in crack growth.