A Nonlinear Cumulative Component Fatigue Evaluation Method
A nonlinear, component technology, applied in the field of nonlinear cumulative component fatigue assessment, which can solve problems such as influences and errors that cannot be considered
Inactive Publication Date: 2015-08-26
SOUTHEAST UNIV
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[0003] However, the fatigue accumulation of materials is a nonlinear process, and the loading sequence of the stress cycle has a significant impact on the damage accumulation, so there is a large error between the theory of the Miller criterion and the corresponding evaluation results and the actual situation; in addition, the Miller criterion is a It is more applicable to the theory of high cycle fatigue, and cannot consider the influence of accidental overload on fatigue accumulation
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[0037] The invention provides a non-linear accumulative member fatigue evaluation method on the basis of damage mechanics, rain flow counting method and other theories and technologies. The present invention is used for the evaluation of nonlinear fatigue damage accumulation of components bearing variable amplitude stress, which can consider the sequence of stress cycle application, and can also consider and estimate the influence of overload on fatigue accumulation. The present invention is especially suitable for structural health monitoring based on monitoring Data fatigue assessment.
[0038] Such as figure 1 As shown, a kind of non-linear accumulative component fatigue assessment method of the present invention comprises several steps:
[0039] 1. The representative standard stress time history σ for the component block (t) (called standard block, block) is preprocessed to obtain the peak-valley sequence p(i);
[0040] 2. Count the rainflow on p(i), and extract the str...
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The invention discloses a nonlinear cumulative fatigue evaluation method for a member. The nonlinear cumulative fatigue evaluation method is used for carrying out fatigue evaluation on the member under the action of a variable amplitude stress time history and comprises the following steps of preprocessing a standard stress time history of the member to obtain a peak valley value sequence; counting rain flows, extracting a stress cycle sequence which is experienced by the member and contains an action precedence order and estimating fatigue damage caused by a standard block; estimating the service life of the member. The nonlinear cumulative fatigue evaluation method disclosed by the invention can be used for bearing the variable amplitude stress member of the fatigue evaluation and is especially suitable for fatigue evaluation based on monitoring data in the structure health monitoring. According to the nonlinear cumulative fatigue evaluation method, the precedence order applied by stress cycle can be considered and the influence of overload on fatigue cumulation can also be considered and estimated.
Description
technical field [0001] The invention belongs to the field of component fatigue assessment, in particular to a non-linear cumulative component fatigue assessment method. Background technique [0002] Among the existing fatigue assessment methods, the S-N curve method is mainly used for the case where the component is mainly subjected to constant amplitude loads; and for slightly more complicated variable amplitude loads, after the stress spectrum is extracted by the cycle counting method, the linear fatigue accumulation method is generally used. Miller's law to assess the degree of fatigue. [0003] However, the fatigue accumulation of materials is a nonlinear process, and the loading sequence of the stress cycle has a significant impact on the damage accumulation, so there is a large error between the theory of the Miller criterion and the corresponding evaluation results and the actual situation; in addition, the Miller criterion is a The theory that is more suitable for h...
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IPC IPC(8): G01M99/00
Inventor 李兆霞吴佰建王莹
Owner SOUTHEAST UNIV