Prediction method of fatigue life of electromagnetic riveted joints

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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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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