A study on damage identification of functionally graded euler-bernoulli beam by the method based on modal strain energy and frequency fusion

doi:10.19936/j.cnki.2096-8000.20210828.004

Abstract

Abstract: For functionally graded (FG) Euler-Bernoulli (EB) beams, a new damage identification method based on modal strain energy fusing with the natural frequency is proposed in this study. The natural frequency and shape modal parameters of the structure are firstly calculated by finite element method, and then the calculation formula of modal frequency strain energy is constructed on the basis of the elemental modal strain energy fusing with the natural frequency. The change of elemental modal frequency strain energy is calculated before and after the damage of the beam structure, and the elemental index of damage identification is defined. Numerical examples show that the new damage identification method of the FG Euler-Bernoulli beam can effectively identify the damage elements of the beam. It is found from the identified results that the new method has good noise resistance performance.

Key words: functionally graded Euler-Bernoulli beam, modal frequency strain energy, damage identification, finite element method, composites

CLC Number:

TB332

LIANG Fu-an, HUANG Jun, HUANG Li-xin. A study on damage identification of functionally graded euler-bernoulli beam by the method based on modal strain energy and frequency fusion[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(8): 25-30.

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