Vibration characteristics of laminates with different repair configurations in hygrothermal environment

doi:10.19936/j.cnki.2096-8000.20230928.002

Abstract

Abstract: Through theoretical derivation and finite element simulation, the vibration characteristics of step-lap repair laminated plates with different damage depths at different temperatures and moisture contents under free boundary conditions are explored. Based on Voklkersen bonding joint model and considering the influence of damp heat effect, the motion balance equation of the repaired laminate is obtained, and the vibration characteristic equation of the repaired laminate is derived. The finite element model of laminated plates with different patching depth is established in ABAQUS software and verified by experiments. Under the conditions of different temperatures and moisture contents, the effects of the number of patching layers, the number of additional layers and the lap length on the vibration characteristics are analyzed. The results show that the increase of natural frequency of repaired laminates increases with the increase of the number of repaired layers; laminates with additional layers can better maintain the natural frequency, and the effect of two layers of additional patches is better than that of one layer; the natural frequency of laminates with non-penetrating repair configuration increases with the increase of lap length; for the penetration repair configuration, its natural frequency is more easily affected by temperature, moisture content and lap length. In the high-temperature dry environment (T=100 ℃, C=0%), when the lap length changes from 1.5 mm to 9 mm, the penetration repair configuration with a lap length of 4 mm has the lowest natural frequency.

Key words: step-lap repair, composite laminates, different repair depth, lap length, hygrothermal effect, modal experiments

CLC Number:

TB332

ZHAO Yaobin, SHAN Jinyang, CUI Kaixin, LU Xiang. Vibration characteristics of laminates with different repair configurations in hygrothermal environment[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(9): 13-20.

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