Numerical study of interaction of nonlinear guided waves with breathing damage in isotropic material
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8th ECCOMAS Thematic Conference on Smart Structures and Materials
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The research field on Structural Health Monitoring attracts more and more scientists due to the increasing use of lightweight structures. During operation structures are affected by loads. When the loads exceed a certain limit it may cause damages which reduce the carrying capacity of structures. The application of Structural Health Monitoring methods permits the detection and localization of damages in structures. Moreover, to assess the structural remaining service life during operation one may want to quantify and qualify damages in structures. Therefore the nonlinear guided wave technique is a promising approach to monitor lightweight structures. This numerical study is focused on the interaction of nonlinear guided waves with breathing damage in isotropic material and its potential to quantify and qualify different damages. Due to contact acoustic nonlinearity a guided wave packet which passes through a breathing crack is distorted. This fundamental changes are observable in form of higher harmonics. The results show that the proposed numerical approach can predict the interaction of guided waves with breathing cracks in isotropic plates. It is shown that different type of damages with varying size, orientation and position influence the nonlinear guided wave differently. Moreover, the results show that the nonlinear guided waves possess high capabilities for damage detection, localization quantification and qualification of breathing cracks in isotropic plates.