A fatigue failure algorithm of stress-cycle number (S-N) based on finite element method

A technology of fatigue failure and cycle times, applied in calculation, electrical digital data processing, special data processing applications, etc., can solve problems that cannot be well solved by scientific description, and achieve the effect of convenient prediction of remaining life and convenient calculation

Pending Publication Date: 2019-03-29
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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Problems solved by technology

Since Wohler brought fatigue into the scope of scientific research, the fatigue research process has c

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  • A fatigue failure algorithm of stress-cycle number (S-N) based on finite element method
  • A fatigue failure algorithm of stress-cycle number (S-N) based on finite element method
  • A fatigue failure algorithm of stress-cycle number (S-N) based on finite element method

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[0043] In the stress tensor history statistical engineering, the present invention first needs to consider the compression of the time history. The time used for fatigue analysis is a function of many entities (nodes and elements), load cases (for superimposed events), analysis type, and time series loads (number of time series data points). One way to reduce the analysis time is to reduce the number of data nodes to be processed during the analysis. The present invention provides a processing method that adopts a peak-valley compression method. In fact, this method provides control options for reducing the number of time series nodes before linear superposition.

[0044] This feature is controlled by the time history compression attribute on each analysis run, which can be classified as None, PeakValley, or Limits.

[0045] Setting to None means that the entire load time history will not be compressed.

[0046] Setting to PeakValley means that the time series will be peak-valley ...

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Abstract

The invention discloses a statistical and evaluation software program method for calculating a standard stress cycle number (Stress-Number, S-N) in a structural fatigue failure by using a finite element algorithm. Through the statistics and calculation of this method, the service life and residual life of various structures under cyclic loading can be evaluated, which is of great significance to the prediction of working condition life of material structures in various practical applications and to the prevention of early warning of dangerous conditions caused by structural failure of parts. The whole frame of the method is arranged in the order of front and back, which mainly includes: acquiring stress tensor history-extracting compound stress parameters from stress tensor - combining stress history with rain flow counting to obtain a series of rain flow cycles - extracting stress parameters from the defined S-N curve, four steps of calculating and estimating damage.

Description

technical field [0001] The present invention relates to a method for evaluating and calculating structural fatigue, more specifically, a method for calculating the cumulative damage superposition of structural stress-cycle times (S-N) and predicting the service life based on a finite element algorithm. Background technique [0002] The actual structure is mostly subjected to dynamic loads, and the stress level it bears is far below the strength limit and yield limit, but it will produce unexpected sudden damage. Since Wohler brought fatigue into the scope of scientific research, the fatigue research process has been continuing, but the real mechanism of fatigue and its scientific description have not been well resolved. [0003] Around 1829, the German Alert first conducted research on metal fatigue. He conducted repeated loading tests on the welded chains of iron mine elevators, and found that under a certain number of repeated loadings, the welded chains were damaged]. In...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 付远姜江程香平
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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