A low-cycle fatigue life analysis method for generator structures

A low-cycle fatigue and life analysis technology, applied in electrical digital data processing, special data processing applications, instruments, etc., it can solve the problem that formula calculation of structural life does not realize process analysis, cannot effectively deal with multi-axial stress problems, and the results are not obvious enough. To reduce the cost of design and development, achieve standardization, and achieve the effect of simple operation

Active Publication Date: 2021-04-13
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

This calculation method has the following disadvantages: (1) The local stress-strain method is based on the assumption of uniaxial stress, which cannot effectively deal with multiaxial stress problems; It leads to the deviation of fatigue analysis; (3) The calculation of structural life by the formula has not realized the process analysis, the efficiency is low, and the results are not explicit enough

Method used

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  • A low-cycle fatigue life analysis method for generator structures
  • A low-cycle fatigue life analysis method for generator structures
  • A low-cycle fatigue life analysis method for generator structures

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Embodiment

[0040] like figure 1 As shown, it is a finite element numerical simulation model of a cantilever beam structure. The specific size parameters are 120mm in length, 20mm in section width, 20mm in height, and a fillet radius of 10mm. Copper material is used, and the applied load is an alternating force of ±5kN at the free end. Take it as the analysis object of this embodiment.

[0041] like image 3 As shown, firstly, the stress and strain of the cantilever beam under 5kN and -5kN loads are obtained by finite element elastoplastic analysis (step 1). Then import the stress and strain results into the self-edited MATLAB program (step 2-3) for low-cycle fatigue analysis, and calculate the fatigue life of the cantilever beam finite element model at each node. Finally, the fatigue life at each node is loaded on each node as a temperature load and displayed (step 4).

[0042] The described low cycle fatigue life analysis method for generator structure is:

[0043] Step 1: Establish...

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Abstract

The invention provides a low-cycle fatigue life analysis method for a generator structure, which is characterized by comprising: Step 1: input the cyclic stress-strain curve of the material into a finite element numerical simulation model of the generator structure, and derive the generator Strain components at rated conditions, strain components at rest conditions, equivalent stresses at rated conditions, equivalent stresses at rest conditions, first principal stress and third principal stress at all nodes of the structure; steps 2: Calculate the strain amplitude and mean stress; Step 3: Calculate the low-cycle fatigue life N of the generator structure at any node. The invention provides a low-cycle fatigue life analysis method for generator structures, which is suitable for various generator structures, has accurate calculation, simple operation, and can realize the standardization of calculation methods and processes.

Description

technical field [0001] The invention relates to a low-cycle fatigue life analysis method for generator structures, which is suitable for generators and large motors, and belongs to the technical field of generator structure analysis. Background technique [0002] The dynamic adjustment of the power generation capacity of the power grid by the power grid, and the regular or non-scheduled maintenance of the generator equipment all require the start and stop of the equipment, which makes many components such as the guard ring, the rotor end teeth, the magnetic pole leads and the water diversion feet suffer from frequent starting and stopping. Low cycle fatigue loads due to shutdown. If these components are damaged by fatigue fracture within the design safety life, it will bring immeasurable losses to safe production. Although fatigue damage is a continuous process, on-line monitoring or maintenance detection of damage is very difficult or impossible. In addition, the onset of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23
Inventor 吴新亚王庭山贺阿亚达李新岩杨昔科
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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