PhD STUDENT, UNIVERSITI TEKNOLOGI MALAYSIA
This topic is to nondestructively evaluate (NDE) turbine blade integrity using digital neutron radiography at low flux research reactor. Neutron radiography is basically using the same method as other radiography technique. Neutron radiography has 4 major components which are neutron source, collimator, samples and detector. In my scope of study, I have to design a collimator that suitable for neutron radiography at Reactor TRIGA PUSPATI (RTP), Malaysia. Besides, I am focusing on turbine blades as my samples of study because turbine blade is a important component in a system. Standard technique for inspecting turbine blades is using electromagnetic method. However, this technique can only applicable for defacts at outer surface of turbine blades. Hence, neutron radiography is a suitable option for evaluate the inner integrity of the turbine blade, since neutron can penetrate deep into the blade. As compared to other radiography technique such as x-ray or gamma radiography, neutron radiography can give different contrast of image because neutron interact with the nucleus of an atom and not with the electron cloud. Thus, neutron can penetrate easily with high atomic number materials such as lead. In my country Malaysia, neutron radiography not popular for inspecting because of several factors. My aims for this reseacrh is to redevelop neutron radiography facility at RTP and find crucial defacts on turbine blade that can only easily detact by neutron radiography.
Abstract: The new reactor FRM-II of Technical University Munich will offer a professional radiography and tomography facility for industrial use. The concept of the instrument and the optimization under the conditions imposed by the surrounding instruments are described for the first installment and for a second stage in an external experimental hall in about 5 years. Several detector systems for different applications will be employed and a short description of their possibilities is given.
Pub.: 13 Jul '04, Pinned: 28 Jul '17
Abstract: This paper presents four complementary non-destructive measurement techniques for material characterization and damage detection of turbine blades. The techniques are macroscopic fringe projection with inverse fringe projection algorithms, robot guided microscale fringe projection, high frequency eddy current and pulsed high frequency induction thermography, both in the megahertz range. The specimen on which the measurements were carried out is a blade of the 1st stage high pressure turbine of a modern airplane jet engine. The turbine blade was characterized with regard to the macroscopic and microscopic geometry, cracks in the base material as well as the condition of the protective layer system.
Pub.: 02 Mar '17, Pinned: 28 Jul '17
Abstract: Complementary in operando X-ray radiography and neutron radiography measurements were conducted to investigate and visualize the initial lithiation in silicon-electrode lithium-ion batteries. By means of X-ray radiography, a significant volume expansion of Si particles and the Si electrode during the first discharge was observed. In addition, many Si particles were found that never undergo electrochemical reactions. These findings were confirmed by neutron radiography, which, for the first time, showed the process of Li alloying with the Si electrode during initial lithiation. These results demonstrate that complementary X-ray and neutron radiography is a powerful tool to investigate the lithiation mechanisms inside Si-electrode based lithium-ion batteries.
Pub.: 13 Dec '16, Pinned: 28 Jul '17
Abstract: The presence of crust on the inner walls of metallic ducts impairs transportation because crust completely or partially hinders the passage of fluid to the processing unit and causes damage to equipment connected to the production line. Its localization is crucial. With the development of the electronic imaging system installed at the Argonauta/Nuclear Engineering Institute (IEN)/National Nuclear Energy Commission (CNEN) reactor, it became possible to visualize crust in the interior of metallic piping of small diameter using real-time neutron radiography images obtained with a low neutron flux. The obtained images showed the resistance offered by crust on the passage of water inside the pipe. No discrepancy of the flow profile at the bottom of the pipe, before the crust region, was registered. However, after the passage of liquid through the pipe, images of the disturbances of the flow were clear and discrepancies in the flow profile were steep. This shows that this technique added the assembled apparatus was efficient for the visualization of the crust and of the two-phase flows.
Pub.: 30 Jan '17, Pinned: 28 Jul '17