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김지수(Jeesoo Kim),신동익(Dongik Shin),손영창(Youngchang Shon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The impeller is routinely proof loaded during manufacture to verify the strength capability. Over-speed test is one of the proof tests for the rotating part. This kind of proof test could be overload to the normal operation cyclic loading. In general, overload when it comes tensile has a good effect to the product life, since the overload sequence generate compressive residual stress. Under these load history, the effective stress level is decreased by residual stress on unloaded condition. Therefore, fatigue life applied tensile overload could be larger than the normal load. Although there are many of papers to show the overload effect to the life in coupon test or theoretical approach, it has not been prepared for the product base application. In this paper, the residual stress and effective stress on life limited location of the impeller are investigated by applying different levels of over-speed which is overload. Then, fatigue strength estimated according to the amount of overload. Finally, the relation between level of overload and fatigue life is prepared in this specific impeller application. The FE analysis is used to estimate the amount of stress/residual stress by applying each load steps. These stress results are correlated to the fatigue life curve of the material.
안철주(Chulju Ahn),박희호(Heeho Park),김민기(Min-Ki Kim),김명효(Myeonghyo Kim),정승채(Seungchai Jung),김기태(Kitae Kim),손영창(Youngchang Shon) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46
The Samsung Techwin has been developed the various types of combustor and fuel nozzle frontal devices for the aero engine and small scale industrial gas turbines. Currently, we have been developed the highly heat capacity and long-lived gas turbine combustor based on the short-lived combustor and fuel injector technologies. In this paper, the market trends and the information on the survey of an advanced gas turbine combustor were introduced for the development of large scale gas turbine combustor and fuel nozzle assembly.