Nondestructive damage evaluation in complex structures using modal-strain parameters

Oscar R. Serna; Norris Stubbs

doi:10.1117/12.238838

22 April 1996 Nondestructive damage evaluation in complex structures using modal-strain parameters

Oscar R. Serna, Norris Stubbs

Proceedings Volume 2719, Smart Structures and Materials 1996: Smart Systems for Bridges, Structures, and Highways; (1996) https://doi.org/10.1117/12.238838
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

Recent developments in the field of fiber optics suggest that in the near future it may be economically feasible to instrument complex structures with fiber optical strain gages. If a method of damage localization and severity estimation were formulated to accept directly the strain data from such devices, the efficiency and effectiveness of fiber optical strain gages could be significantly enhanced. In this paper a method to locate and size structural damage in complex structures with minimal modal strain parameters is presented. A theory of damage localization and severity estimation is formulated in terms of modal strains. A finite element model (FEM) of the structure to be analyzed is developed. Modal strains are calculated for every member of the undamaged structure. Modal strains are also obtained from the structure with simulated damage or from the actual structure in the field. The damage localization formulation is used to localize damage for a variety of damaged scenarios. Finally, the reliability and accuracy of the method is evaluated.

Citation Download Citation

Oscar R. Serna and Norris Stubbs "Nondestructive damage evaluation in complex structures using modal-strain parameters", Proc. SPIE 2719, Smart Structures and Materials 1996: Smart Systems for Bridges, Structures, and Highways, (22 April 1996); https://doi.org/10.1117/12.238838

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