Method for predicting fatigue crack propagation life of pantograph
A Fatigue Crack Propagation, Prediction Method Technology
Active Publication Date: 2021-05-25
SOUTHWEST JIAOTONG UNIV
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[0005] Aiming at the above-mentioned deficiencies in the prior art, a method for predicting the fatigue crack growth life of a pantograph provided by the present invention solves the problem of lack of an effective method for predicting the fatigue life of a pantograph crack
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[0059] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0060] Such as figure 1 As shown, a pantograph fatigue crack growth life prediction method, including the following steps:
[0061] S1. Load the pantograph welding sample to obtain the fatigue crack growth rate parameter of the weld material;
[0062] Step S1 comprises the following steps:
[0063] S11. According to GB / T 6398-2000 test method for fatigue crack growth of metal materials, standard test method ASTM E647-11 f...
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The invention discloses a method for predicting the fatigue crack propagation life of a pantograph, and the method comprises the following steps: S1, loading a pantograph welding sample, and obtaining a fatigue crack propagation rate parameter of a welding line material; s2, performing equivalent treatment on the typical load spectrum of the pantograph by adopting an equivalent stress method according to the fatigue crack growth rate parameter to obtain an equivalent load corresponding to a constant-amplitude load; s3, defining the shape, position and size of the initial defect of the pantograph structure, and establishing a simplified finite element model of the pantograph upper frame; and s4, loading an equivalent load on the simplified finite element model of the pantograph upper frame, constructing a relation curve between the crack length a and the stress intensity factor K and a fatigue crack propagation life model, and achieving prediction of the fatigue crack propagation life. The method solves the problem of lack of an effective method for predicting the fatigue life of the pantograph crack.
Description
technical field [0001] The invention relates to the technical field of pantograph fault diagnosis for electrified railways, in particular to a method for predicting the fatigue crack extension life of a pantograph. Background technique [0002] In the high-speed electrified railway, the pantograph installed on the roof of the train is one of the key components of the train. The transmission of electric energy is realized through the sliding contact with the catenary, which ensures the normal operation of the train. Fatigue and fracture are the main reasons for the failure of the pantograph. If there is a crack in the pantograph, it will affect the stable contact of the pantograph-catenary and endanger the driving safety. Therefore, it is necessary to numerically model the pantograph, accurately obtain the stress distribution of the pantograph for structural static analysis, and predict the life of fatigue crack growth to prevent the pantograph from being damaged. [0003] T...
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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0023G01N2203/0066G01N2203/0216G01N2203/0218G01N2203/0258G01N2203/0071G01N2203/0073G01N2203/0641
Inventor 周宁刘久锐张欣刘钊程尧李田张卫华
Owner SOUTHWEST JIAOTONG UNIV