Prejudging method for static-test load carrying capacity of wing structure

Abstract

The invention belongs to the technology of airplane structural strength and relates to a prejudging method for the static-test load carrying capacity of a wing structure. The prejudging method of the invention comprises the steps as follows: establishing a finite element model according to a wing structure before carrying out an actual test, and performing elastoplasticity and large deflection nonlinear finite element analysis to the model to obtain a wingtip deflection-load curve; determining maximum load carrying capacity of the wing structure according to the variation characteristic of the wingtip deflection-load curve and giving out the breaking load of the wing structure; obtaining a dangerous portion of the wing structure and the process form the unstable condition to the destructive condition and pre-judging the static-test load carrying capacity of the wing structure. According to the invention, the error between the calculated breaking load and the tested breaking load is 6.25 percent. The calculated dangerous part and the tested breaking portion are consistent. The calculated process form the unstable condition to the destructive condition is consistent with the tested unstable process. The method of the invention provides a guarantee for the one-time success of the static test of the structure and provides reference for evaluating the structural strength of the wing.

Description

technical field [0001] The invention belongs to the technology of aircraft structure strength, and relates to a pre-judgment method for the bearing capacity of a wing structure static test. Background technique [0002] Literature [Analysis of bearing capacity of composite multi-wall structure [J]. Journal of Composite Materials, 2006, 23(4): 119-123.] [0003] It is typical to represent the current method for estimating the post-buckling capacity of wing structures. This method is calculated by establishing a calculation model for the bearing capacity of a multi-wall structure and deriving a formula for calculating the bearing capacity. The specific method is: [0004] 1) According to the multi-wall structure, establish a bearing capacity calculation model; [0005] 2) Deduce the buckling analysis formula of composite multi-wall structure; [0006] 3) Deduce the post-buckling analysis formula of composite multi-wall structure; [0007] 4) Deduce the minimum design thic...

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Problems solved by technology

[0010] 1) It can only calculate the regular multi-wall structure, but cannot accurately give the bearing capacity of the delta wing structure; 2) This method can only give the total bearing capacity, but cannot give the dangerous parts of the structure and the failure process;

[0011] 3) Since the wing is composed of multiple box sections, when using this method to calculate, it is assumed that each box section has reached the ultimate bearing capacity when it is damaged, so the calculated value is conservative;

[0012] 4) Only the bending moment generated by the external load is considered in the calculation, and the composite load such as the torque generated by the external load is not considered, which affects the accuracy of the calculation results

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