Prediction method of fatigue life of electromagnetic riveted joints

A fatigue life prediction, electromagnetic riveting technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of long time consumption and high cost, and achieve the effect of shortening time consumption and reducing cost

Inactive Publication Date: 2016-02-17
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

[0003] In order to overcome the disadvantages of high cost and long time consumption caused by the existing test method for obtaining the fatigue life of electromagnetic riveted joints, the present invention provides a method for predicting the fatigue life of electromagnetic riveted joints

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  • Prediction method of fatigue life of electromagnetic riveted joints
  • Prediction method of fatigue life of electromagnetic riveted joints
  • Prediction method of fatigue life of electromagnetic riveted joints

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Embodiment Construction

[0019] refer to Figure 1-5 . In order to overcome the problems of high test cost and long time consumption, and replace the current test method used to obtain the fatigue life of electromagnetic riveted structures, the present invention discloses a method for calculating the life of electromagnetic riveted joints by using the stress and strain results obtained by numerical simulation. This method uses the structural stress and strain obtained by numerical simulation as the input of the fatigue life model, so that the fatigue life of the electromagnetic riveted joint can be obtained through pure calculation. Compared with the test method, this method can significantly reduce the cost and time consumption of life acquisition.

[0020] According to one aspect of the present invention, the numerical simulation is performed by finite element simulation, and the finite element model is used to define a specific electromagnetic riveting process of the metal sandwich. The model inc...

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Abstract

The invention discloses a method for predicting the fatigue life of an electromagnetically-riveted joint, which is used for solving the technical problems of high cost and long consuming time caused by an existing test method for obtaining the fatigue life of the electromagnetically-riveted joint. The technical scheme is that a finite element model is used for dynamic simulation; the finite element model comprises multiple solid units which are used for representing a rivet and riveted metal interlayers respectively; the rivet is shaped under the shock action of a rivet model which suffers external force; during the period, the rivet extrudes an interlayer hole, so that the interlayer hole synchronously realizes elasticoplastic deformation; according to the method, a strained riveting structure with residual stress, which is obtained through finite element calculation is taken as the input of a fatigue life analysis model. When a finite element result is imported into fatigue analysis software, the fatigue life analysis model is established and the fatigue performance is evaluated, the fatigue life of an electromagnetically-riveted structure is predicted; not only is the cost lowered, but also the consuming time is shortened.

Description

technical field [0001] The invention relates to a method for predicting the fatigue life of a joint, in particular to a method for predicting the fatigue life of an electromagnetic riveted joint. Background technique [0002] As one of the main connection methods for aircraft structures at present, the riveting process is simple in operation and stable and reliable in connection strength. The impact force generated by the riveting gun in electromagnetic riveting has a very high loading rate on the rivet, which can form a uniform interference amount between the nail rod and the hole wall of the riveted interlayer, thereby prolonging the life of the joint; coupled with its stable quality and low cost, it has been It has been applied in Airbus A380 and other aircrafts (“A Preliminary Study on the Application of Electromagnetic Riveting Technology in Large Aircraft Manufacturing”, Acta Aeronautica Sinica, Volume 29, Issue 3, 2008, 716-720). In China, the research on electromagn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 曹增强张岐良孙胜陈允全秦龙刚余书华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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