Failure judgment method for bonding-riveting connection structure

Abstract

The invention discloses a failure judgment method for a bonding-riveting connection structure. The failure judgment method comprises the following steps of firstly, establishing a finite element simulation model of the bonding-riveting connection structure; step 2, determining a rivet failure judgment equation and a glue layer failure judgment equation; step 3, applying a displacement load to thefinite element simulation model, judging whether the rivet is invalid or not through the failure judgment equation, and judging whether the glue layer is invalid or not through the glue layer failurejudgment equation; when the strain of the rivet is greater than or equal to the failure strain, judging that the rivet fails; and when the adhesive layer failure judgment index s is greater than or equal to 1, judging that the adhesive layer fails. According to the failure judgment method for the adhesive-riveting connection structure, failure judgment is conducted on the adhesive-riveting connection structure according to the rivet failure judgment equation and the adhesive layer failure judgment equation, and the accuracy of failure judgment of the adhesive-riveting connection structure canbe improved.

Description

technical field [0001] The invention belongs to the technical field of vehicle body structure design, and in particular relates to a method for judging failure of an adhesive riveting connection structure. Background technique [0002] At present, the automobile industry is booming. In the face of the current fossil fuels gradually decreasing, environmental pollution is becoming more and more serious, in order to achieve energy saving and emission reduction and increase the cruising range, the development of automobile lightweight is particularly important. At present, there are mainly two ways to realize the lightweight of automobiles that are widely used: one is to rationally optimize the structure of automobiles; the other is to realize lightweight by applying new materials such as aluminum-magnesium alloys, composite materials, and high-strength steel; Use advanced manufacturing technology to achieve lightweight. [0003] The application of new body materials (especiall...

AI Technical Summary

Problems solved by technology

[0003] The application of new body materials (especially CFRP) inevitably brings about the connection of dissimilar materials. The existing traditional connection methods such as welding, screwing and riveting cannot fully meet the needs of CFRP connection, and a single connection technology also exists certain limitations

Bonding has the advantages of uniform stress distribution, good appearance quality, good fatigue resistance, no opening deformation and thermal deformation, etc.; its disadvantages are thin adhesive, insufficient damage and energy absorption effect, and easy aging of the adhesive, etc.

Compared with bonding, the riveted structure has a better energy absorption effect when it is damaged, and its performance is less affected by the environment, and its reliability is high; the disadvantage is that the direct contact between the rivet and the metal material of the vehicle body will lead to electrochemical corrosion

Consider a connection method that combines bonding and riveting. This method can effectively combine the advantages of the two and make up for the shortcomings of simple bonding or riveting while achieving the purpose of a material connection. s solution

At present, there are many researches on bonding and riveting at home and abroad, but there are not many researches on the simulation method of bonding riveting connection structure, and the research on the connection between steel and CFRP is mostly based on experiments.

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