A method for modifying a constitutive model of a composite edge-bonded structure considering strain rate effect

By preparing specimens and using the Cowper-Symonds model to correct the bonding strength, the accuracy problem of mechanical response under high strain rate in traditional simulation methods was solved, and the simulation accuracy and safety assessment of composite edge-wrapped structures under high-speed impact were improved.

CN122369705APending Publication Date: 2026-07-10NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2026-03-25
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Traditional numerical simulation methods struggle to accurately predict the mechanical response of composite edge-bonded structures under high strain rates, causing simulation results in bird strike resistance studies to deviate from actual working conditions and affecting the accuracy of engineering design and safety assessment.

Method used

A constitutive model correction method for composite edge-bonded structures considering strain rate effects was adopted. Quasi-static and dynamic tensile tests were conducted on prepared specimens. The Cowper-Symonds model was used to correct the bond strength by strain rate, thereby correcting the strength and stiffness of the material to reflect the dynamic mechanical properties under high strain rates.

Benefits of technology

It significantly improves the accuracy of numerical simulation of cemented structures under complex working conditions such as high-speed impact, and enhances the accuracy of structural stability and safety assessment of metal-edged composite blades under impact loads.

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Abstract

The application discloses a composite edge-coated cemented structure constitutive model correction method considering strain rate effect. First, by comparing several constitutive models commonly used for simulating cemented structures, experimental data of materials under different strain rates are fitted. Then, dynamic mechanical property data and variation rules are obtained by testing the mechanical properties of the cemented structure, the fitting accuracy of different strain rate correction models on the experimental data is analyzed and compared, and the most appropriate model for fitting the experimental data is selected for characterization. Finally, the constitutive model correction considering high strain effect is completed.
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