{"title":"Wave Interaction with Defects in Pressurized Composite Structures","authors":"R. K. Apalowo, D. Chronopoulos, V. Thierry","volume":121,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":28,"pagesEnd":35,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10006148","abstract":"A wave finite element (WFE) and finite element<br \/>\r\n(FE) based computational method is presented by which the<br \/>\r\ndispersion properties as well as the wave interaction coefficients for<br \/>\r\none-dimensional structural system can be predicted. The structural<br \/>\r\nsystem is discretized as a system comprising a number of waveguides<br \/>\r\nconnected by a coupling joint. Uniform nodes are ensured at the<br \/>\r\ninterfaces of the coupling element with each waveguide. Then,<br \/>\r\nequilibrium and continuity conditions are enforced at the interfaces.<br \/>\r\nWave propagation properties of each waveguide are calculated using<br \/>\r\nthe WFE method and the coupling element is modelled using the<br \/>\r\nFE method. The scattering of waves through the coupling element,<br \/>\r\non which damage is modelled, is determined by coupling the FE and<br \/>\r\nWFE models. Furthermore, the central aim is to evaluate the effect of<br \/>\r\npressurization on the wave dispersion and scattering characteristics<br \/>\r\nof the prestressed structural system compared to that which is not<br \/>\r\nprestressed. Numerical case studies are exhibited for two waveguides<br \/>\r\ncoupled through a coupling joint.","references":"[1] S. Kessler, S. Spearing, and C. Soutis, \u201cDamage detection in composite\r\nmaterials using lamb wave methods,\u201d Smart Materials and Structures,\r\nvol. 11, pp. 269\u2013278, 2002.\r\n[2] O. C. Zienkiewicz and R. L. 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