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Research on the Relationship between Cumulate Damnification of Structure and Magnetism Memory Domino Offect

Author: WuLei
Tutor: DaiGuang
School: Daqing Petroleum Institute
Course: Safety Technology and Engineering
Keywords: Magnetic Memory Stress concentration Leakage magnetic field Cumulative damage Steam Turbine Blades
CLC: TH114
Type: Master's thesis
Year: 2005
Downloads: 449
Quote: 2
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Any engineering structures are inevitably exist similar microcrack injury. The presence of these injuries, reducing the carrying capacity of the structure. Even in a static or slowly varying loads, also due to the dynamic extension of the lesion and cause fracture. Traditional NDT methods due to the limitations of the principle and the process can only be detected has developed into a form of the defect, but the early damage for metal components such as micro-cracks, especially unformed recessive discontinuous change, difficult to implement effective evaluation. Reliable, sensitive detection of early damage in the metal structure, metal structure implicit discontinuous change is necessary to explore the new theory, the development of new instruments. Metal magnetic memory testing technology to the field of non-destructive testing of a new means of non-destructive testing, early diagnosis more accurate evaluation of the safety of the equipment, can be determined with high accuracy detection of objects on the stress concentration area for logo the most dangerous region of the only non-destructive testing methods. Field magnetic memory testing, according to the basic characteristics of the stress concentration area, it is easy to determine the component areas of stress concentration, the stress concentration determination of the severity of the absence of a clear criteria, however, restricted magnetic memory testing technology in the actual . Solve these problems in the electronic universal testing machine, tensile tests with an orifice plate pieces, board member vibration and rotation experiment by experiment to analyze the relationship between the cumulative damage of the components and magnetic memory effect, the magnetic component memory signal to make the right security evaluation. The main work of this article: a brief review of the overview of the development of magnetic memory testing technology. Introduction and Review of the development of domestic and foreign magnetic memory tester hardware and signal processing technology and Research; 2. Study the mechanism of magnetic memory testing technology. Starting from the microscopic structure of the material, combined with the theory of exchange interactions and energy band theory, the exchange integral factor analyzed, and combined with the detailed derivation of thermodynamics derived formula piezomagnetic effect; 3. Doing experiments to analyze the cumulative damage of components and magnetic memory effect relationship. These experiments include vibration experiments of the tensile test of the orifice plate member, the plate member, the plate member of the rotation experiment. First, before the experiment with a large finite element analysis software ANSYS stress analysis of the perforated plate pieces and plates modal analysis, done after the experiment with magnetic memory signal analysis software and Origin software to analyze the detection signal; 4 on-site Turbine blades a magnetic memory testing and signal analysis. Found by detecting the magnetic memory testing technology is an effective method of early diagnosis of steam turbine blades, and the dangerous parts of the different structure of the rotor. Shrouds the rotor dangerous parts of the main shroud at the blade root and the last few levels; dangerous parts of the rotor with lacing in the stretch at the blade root and the last few levels, especially in the stretch parts.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical strength
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