Method for obtaining CFRP sample damaged by low-velocity impact at low test cost

Abstract

The invention provides a method for obtaining a CFRP sample damaged by low-velocity impact at a low test cost, comprising the following steps: establishing a finite element model of the health state of the CFRP structure; obtaining a numerical simulation signal of the health state; constructing an experimental system and obtaining experimental data of the health state; constructing an error correction matrix; constructing a finite element model of the low-velocity impact damage state of the CFRP structure; obtaining a numerical simulation signal of the low-velocity impact damage state; correcting the numerical simulation signal of the low-velocity impact damage state by utilizing the error correction matrix so as to obtain a sample of the CFRP structure at low-velocity impact damage state.According to the method for obtaining a CFRP sample damaged by low-velocity impact at a low test cost, the sample of the CFRP structure at low-velocity impact damage state is obtained by correcting the numerical simulation signal of the low-velocity impact damage state with the error correction matrix, and the problem of obtaining a sample of a damaged CFRP structure at a low test cost is solved.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a method for obtaining CFRP low-velocity impact damage samples at low test costs. Background technique [0002] Carbon Fiber Reinforced Polymer (CFRP) has excellent characteristics such as light weight, high strength, and strong designability. It is an indispensable strategic new material in cutting-edge technology fields such as aerospace. However, due to the heterogeneity and anisotropy of carbon fiber composite materials, it is particularly sensitive to impact. Even a low-speed impact with an impact speed below 10 m / s will cause undetectable surface damage such as internal delamination of the structure. . One of the core key technologies to be broken through in the application of carbon fiber composite materials is the low-velocity impact health monitoring technology. However, since the damage evolution law and failure process of carbon fiber composite materials a...

AI Technical Summary

Problems solved by technology

However, in cutting-edge technology fields such as aerospace, due to the high reliability of structural design and high cost, it is extremely expensive and difficult to obtain damage samples by destroying composite structures, which greatly restricts the low-velocity impact damage of CFRP based on the acquisition of damage samples. Practical Applications of Health Monitoring Technology

Finite element simulation can obtain damage numerical simulation samples by numerically simulating the damage of composite material structures, but due to non-ideal boundary conditions, finite element discretization, nonlinear structural characteristics, etc., the finite element model must have modeling errors

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