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Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

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Pollack Periodica
Authors: Patricia Duratna, Jan Bujnak, and Abdelhamid Bouchair

Machacek J., Cudejko M. Shear connection in steel and concrete composite trusses, SDSS’Rio 2010 Stability and Ductility of Steel Structures , Rio de Janeiro, Brazil, 8–10 September, 2010, pp. 847

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References [1] Eurocode 4 , Design of composite steel and concrete structures, Part 1-1, General rules and rules for buildings, March 1992. [2] Eurocode 4

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. Drzal L. T. Mohanty A. K. Arora S. Are natural fibers composites environmentally

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Eurocode No. 4 , Design of composite steel and concrete structures, Part 1-1, General rules and rules for buildings, March 1992. Design of composite steel and concrete structures, Part 1-1, General

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. Glued composite timber-concrete beams, I: Interlayer connection specimen tests, ASCE , Journal of Structural Engineering , Vol. 136 , No. 10 , 2010 , pp. 1236 – 1245 . [3

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Ceccotti A. Timber-concrete composite structures, Timber Engineering , Step 2, First Edition, Centrum Hout, The Netherlands, 1995, pp. E13/1–E13/12. Ceccotti A

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adhesion to substrate but also retains high biocompatibility and bioactivity of the Hap coating [ 16 , 17 ]. The PEG-modified hydroxyapatite composite coating exhibited improved binding strength of Hap to the substrate with increased packing density of Hap

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of fiber-surface treatment on the mechanical properties of jute-polypropylene composites, Composites Part A , Vol. 28, 1997 pp. 1001–1005. Bledzki A. K. The influence of fiber

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F. K. Chang 1998 Identifying Impacts in Composite Plates with Piezoelectric Strain Sensors. Part 1: Theory Journal of Intelligent Material Systems and Structures

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