Nondestructive damage evaluation in nonlinear structures /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1993.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Several Nondestructive Damage Evaluation (NDE) methods are applied to nonlinear structures. The NDE methods are comprised of three modal-based algorithms developed at Texas A&M University in recent years, and of one energy-based approach newly developed in this work. The modal-based NDE methods were initially designed for linear structures. The extent to which the methods can be applied to nonlinear structures is investigated here. All methods are applied a) to nonlinear elastic structures, b) to nonlinear structures with viscous damping, and c) for comparison purposes, to a linear structure with structural damping. To determine the limitations and shortcomings of the NDE methods as a function of the problem parameters, the methods are applied to structures with varying system parameters such as different degrees of nonlinearity, different magnitudes of excitation, and different magnitudes of damping. The performance of each method is evaluated on the results of a series of numerical experiments on a selected test structure. The modal-based methods prove limited in the application to nonlinear structures. None of the modal-based methods satisfactorily predicts structural damage for structures with strong nonlinear behavior. The energy-based method correctly localizes and sizes structural damage independently of the class of structure or of the magnitude of nonlinearity. With respect to detectability and accuracy, the energy-based method significantly outperforms the modal-based methods. Also, with respect to the practicality of the approach, the energy-based method is superior to the modal-based methods. |
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| Item Description: | Vita. "Major subject: Civil Engineering." |
| Physical Description: | xiv, 166 leaves : illustrations ; 28 cm |
| Bibliography: | Includes bibliographical references. |