Method for predicting compression rigidity and compression strength of composite material spiral structure by considering geometric nonlinearity

Abstract

A method for predicting compression rigidity and compression strength of a composite material spiral structure by considering geometrical nonlinearity comprises the following four steps: step 1, defining the geometrical shape and size of the spiral structure of the composite material, and determining a mathematical expression of a relationship among geometrical parameters; 2, carrying out stress analysis on any cross section A, and calculating the deformation and compression rigidity of the composite material spiral structure based on an energy principle; 3, through the compression deformationincrement and the compression load increment in the cumulative loading process, establishing a load displacement relation considering geometric nonlinearity of the composite material spiral structure, and linearly fitting a load displacement curve according to a least square method; 4, deriving a composite material helical structure compression strength analytical expression by adopting principaldirection stress and a TsaiHill failure criterion; the invention is convenient and efficient, and the compression rigidity and the compression strength of the spiral structure of the composite material can be conveniently and quickly predicted only by determining performance parameters and geometrical parameters of component materials.

Description

technical field [0001] The invention provides a method for predicting compression stiffness and compression strength of a helical structure of composite materials considering geometric nonlinearity, and belongs to the field of composite material design. Background technique [0002] Helical structures can store and release strain energy through elastic deformation, and have been widely used in aerospace and automotive fields. The traditional helical structure is generally made of metal materials. Although the manufacturing process is simple and the price is low, there is an obvious problem of large weight, which does not meet the requirements of lightweight design. Using a composite material helical structure instead of a metal helical structure can effectively reduce the weight of the helical structure and take into account excellent mechanical properties. The cost of directly measuring the compression stiffness and compressive strength of the helical structure of composit...

AI Technical Summary

Problems solved by technology

Experimental means to directly measure the compression stiffness and compressive strength of the helical structure of composite materials is expensive, and the test process is easily affected by many accidental factors

The finite element numerical simulation method needs to establish a complex finite element model, the calculation is complicated, the calculation efficiency is low, and the calculation accuracy is difficult to guarantee

Images