Strain field reconstruction visualization method and system based on load strain linear superposition

Abstract

The invention provides a strain field reconstruction visualization method and system based on load strain linear superposition. The method comprises the following steps: acquiring beam parameter data and beam surface strain data; obtaining a full-field strain value according to the obtained data, and mapping the full-field strain value to a unit grid node of the beam finite element model, wherein the calculation of the full-field strain value comprises the following steps: obtaining a strain response column vector according to the surface strain data of the cross beam; obtaining a strain response matrix of finite element nodes and a structural full-field strain response matrix according to the obtained beam parameter data; obtaining a strain weight according to the strain response column vector and the strain response matrix of the finite element node; and obtaining a full-field strain value under the static load working condition according to the full-field strain response matrix and the strain weight. According to the method, a load and strain reconstruction model is established by extracting mechanical parameters such as strain on the basis of an elastic mechanics principle by applying a linear superposition means, and accurate reconstruction of the cross beam structure is realized.

Description

technical field [0001] The present disclosure relates to the technical field of strain field reconstruction, in particular to a strain field reconstruction visualization method and system based on linear superposition of load and strain. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Due to its light weight, high specific strength and high specific stiffness, aluminum alloy materials provide feasible solutions for lightweight, service life and environmental adaptability in aerospace, railway transportation, bridge construction and other fields. It plays an important role in the material application system. [0004] In the aluminum alloy load-bearing structure, the crossbeam is an important part that bears the weight of the car body and the equipment under the suspension car, and has become the most extensive load-bearing component in t...

AI Technical Summary

Problems solved by technology

Among them, the modal superposition method is widely used in reconstruction and requires the least number of strain sensors, but its disadvantage is that the modal analysis of the structure is required in advance, and the order of the modal analysis has a great influence on the reconstruction of the deformation field. The accuracy has a great impact; the geometric interpolation method divides the plate beam structure into segments at equal intervals, and performs strain interpolation through segmented linear functions or nonlinear functions to reconstruct the structural strain state curve, but it is not suitable for strain reconstruction of complex structures; the inverse is limited The element method has a fast solution speed and the algorithm does not depend on material properties and external load properties

However, when the size of the measured object is large, the number of sensors required is too large, which limits its engineering practicability and application range

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