Method for analyzing load and stress distribution and stress levels of composite mechanical connection pins

Abstract

The invention relates to a method for analyzing load and stress distribution and stress levels of composite mechanical connection pins, which is technically characterized by comprising the following steps of: establishing a two-dimensional shell beam model to calculate the load distribution of the connection pins, and taking out the bypass load of a rectangular region nearby a target pin from the two-dimensional model; newly establishing a three-dimensional physical model comprising target pins on the basis of the two-dimensional shell beam model according to geographic information, such as the size of the rectangular region, the sizes of bolts and the like; and calculating the three-dimensional model by taking the bypass load taken out from the two-dimensional model as the force boundary condition of the three-dimensional model through applying the pre-tightening forces of the bolts to obtain the stress distribution and the stress level of the region. According to the method for analyzing the load and stress distribution and the stress level of the composite mechanical connection pins, the advantages of a two-dimensional modeling method and a three-dimensional modeling method in a finite element model are fully performed, and thereby, a rapid and accurate computing method is provided for distribution calculation and stress analysis on the connection pins in project, and the design cost is reduced.

Description

technical field [0001] The invention relates to a method for analyzing the mechanical connection nail load, stress distribution and stress level of composite materials, which can be used in the fields of aerospace vehicle structure design, mechanical design and manufacturing. Background technique [0002] Due to its high specific strength, high specific stiffness, good corrosion resistance and excellent designability, composite material structures have been more and more widely used in the field of aviation and aerospace in recent years, and have become one of the important materials for aircraft structures. The amount of composite materials is usually expressed as a percentage of the weight of the aircraft body structure, and has become one of the important indicators of the advanced level of aircraft structure design. [0003] The main load-bearing structures of composite materials are connected by a large number of bolts. This type of mechanical connection structure is th...

AI Technical Summary

Problems solved by technology

The simple two-dimensional plate and shell model method is a simplified simulation method, which has a short calculation period and can obtain nail load distribution results that meet engineering accuracy; Influenced by factors such as preload, nail-hole assembly clearance, friction, etc., and the interlayer stress cannot be obtained

The method of establishing a three-dimensional solid model can consider various influencing factors in the above actual situation, but its disadvantages are that the modeling process is complex, the calculation cycle is too long, and it is not universal, and the convergence problem of nonlinear iterative calculation of contact problems often becomes a difficulty , not suitable for practical application in engineering

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