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Damage Detection of Functionally Graded Euler-Bernoulli Beam Based on Element Modal Strain Energy Equivalence Index

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Modal strain energy has been widely utilized in structural damage detection for its excellent performance. Based on the element modal strain energy equivalence index, a damage identification method for functionally graded Euler-Bernoulli beam is proposed in this paper. The damage index is obtained based on the change of element modal strain energy before and after the occurrence of damage and the theory of dissipation ratio of modal strain energy. Numerical examples of a simply-supported and a continuous functionally graded Euler-Bernoulli beam are studied to demonstrate the efficiency of the method. The effects of gradient index, damage extent, the order of mode shape and noise level are investigated respectively. It is demonstrated that the proposed method has very good capability for identifying damage locations and extent, also has excellent resistance to measurement noise.
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Keywords: EQUIVALENCE INDEX; EULER-BERNOULLI BEAM; FUNCTIONALLY GRADED MATERIALS; MODAL STRAIN ENERGY; STRUCTURAL DAMAGE DETECTION

Document Type: Research Article

Publication date: July 1, 2018

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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