Method for calculating load distribution of composite bolt connection by considering clearance and friction influence

Abstract

The invention provides a method for calculating load distribution of composite bolt connection by considering clearance and friction influence and relates to a composite bolt connection technique. The method comprises the following steps: constructing a structure node unit model; inputting a geometrical parameter, a material parameter and a boundary condition to complete the construction of a bolt connecting model; calculating node displacement on the basis of the constructed bolt connecting model; accordingly calculating the bolt load distribution. According to the method, a bolt connecting model structure is generated on the basis of an EXCEL frame; the following three conditions are considered for the unit stiffness matrix and the corresponding equivalent load vector of the bolt: the influence caused by clearance and friction is not considered, the influence caused by clearance is considered and the influence caused by clearance and friction is considered; the method has the advantages of high calculation efficiency of spring model and high modeling efficiency of finite element method; the problems of low calculation efficiency and complex modeling on the basis of consideration for the influence caused by clearance and friction of the traditional finite element method can be avoided; compared with the traditional spring model, the method is higher in modeling efficiency and is short in model modification time.

Description

technical field [0001] The invention relates to a technology for bolt connection of composite materials, in particular to a calculation method for determining and calculating the load distribution of composite materials considering the influence of clearance and friction, and realizes the rapid establishment of a bolt connection model of composite materials and the calculation of load distribution. Background technique [0002] Composite materials have the advantages of specific strength, high specific stiffness, small thermal expansion coefficient, fatigue resistance, corrosion resistance, short manufacturing cycle and convenient maintenance, etc., and are widely used in aerospace structures, especially in the main bearing parts. application. Bolt connection is usually used for the connection between laminates of composite materials, or the connection between composite materials and metals. It has high reliability, strong bearing capacity and convenient disassembly, so it i...

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Problems solved by technology

[0004] Aiming at the defect that the existing theoretical analysis method of bolt connection is not easy to establish a calculation model, the present invention proposes a method for determining the load distribution of composite material bolt connection considering the influence of gap and friction, which not only includes the advantages of high calculation efficiency of the existing theoretical analysis method , and at the same time can quickly establish a bolted connection calculation model

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