Active and passive combined composite material damage quantitative identification method

Abstract

The invention discloses an active and passive combined composite material damage quantitative identification method, which comprises the following steps: firstly, based on an undamaged structure, through measurement information such as geometry, quality, static characteristics and dynamic response, constructing a structure virtual numerical model, and measuring a corresponding basic signal; secondly, aiming at a damaged structure, judging a damage position by utilizing an active excitation signal of a piezoelectric sensor and adopting a time reversal imaging method; and finally, constructing a damage variable based on rigidity reduction for the position where the damage occurs based on damage mechanics, and performing damage quantitative identification by using passive static response and dynamic response signals. On the basis, the damage of the composite material can be quantitatively identified, the obtained identification result can more accurately reflect the residual mechanical property of the structure, and guidance is provided for a control strategy and a maintenance strategy of a subsequent structure.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a method for quantitatively identifying damage to composite materials based on an active and passive combination. Background technique [0002] In aerospace engineering, due to the working environment of advanced aircraft such as aerospace vehicles and new generation fighters due to their long endurance, light weight, large overload, wide Mach, multi-mission profile, strong robustness and high reliability Design requirements, composite materials with high specific strength and high specific stiffness are widely used. However, advanced aircraft are inevitably affected by unsafe factors such as fatigue, large overload, and impact during long-term service, which makes the composite material airframe structure damaged. [0003] In order to reduce further losses caused by damage and damage and ensure the structural safety performance of advanced aircraft, it is necessary to detect...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the disadvantages of the prior art that the degree of damage cannot be judged and strong ill-posedness, and to provide a composite material damage quantitative identification method combining active and passive methods, which comprehensively adopts the active monitoring method based on the wave theory and the static monitoring method based on static monitoring. The passive monitoring method of force response and vibration theory uses a variety of sensors such as piezoelectric sheet sensors and resistive strain sensors to quantitatively identify the damage of composite materials. The identification results obtained can more accurately reflect the remaining mechanical properties of the structure. Provide guidance on subsequent structural control strategies and maintenance strategies

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