000021559 001__ 21559
000021559 005__ 20170622131252.0
000021559 04107 $$aeng
000021559 046__ $$k2017-06-15
000021559 100__ $$aThierry, Victor
000021559 24500 $$aQUANTIFICATION OF GUIDED WAVE INTERACTION EFFECTS WITH LOCALISED STRUCTURAL NONLINEARITIES IN COMPLEX, COMPOSITE STRUCTURES

000021559 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021559 260__ $$bNational Technical University of Athens, 2017
000021559 506__ $$arestricted
000021559 520__ $$2eng$$aThe extensive usage of composite materials in modern industrial applications implies a great range of possible structural failure modes for which the structure has to be frequently and thoroughly inspected. Nonlinear guided wave inspection techniques have been continuously gaining attention during the last decade. This is primarily due to their sensitivity to very small sizes of localized damage. A number of complex transformation phenomena take place when an elastic wave impinges on a nonlinear segment, including the generation of higher and sub-harmonics. Moreover, the transmission and reflection coefficients of each wave type become amplitude dependent. In this work, a generic Finite Element (FE) based computational scheme is presented for quantifying guided wave interaction effects with Localized Structural Nonlinearities (LSN) within structures of arbitrary layering and geometric complexity. Amplitude dependent guided wave reflection, transmission and conversion is computed through a Wave and Finite Element (WFE) method. The scheme couples wave propagation properties within linear structural waveguides to a LSN and is able to compute the generation of higher and sub-harmonics for each wave type through a harmonic balance projection. A Newton-like iteration scheme is employed for solving the system of nonlinear differential equations. Numerical case studies are exhibited for a set of waveguides coupled through a joint exhibiting nonlinear mechanical behaviour.

000021559 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021559 653__ $$aStructural nonlinearities, Wave Interaction with Damage, Finite Elements, Composite Structures, Nonlinear Ultrasound

000021559 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021559 720__ $$aThierry, Victor$$iAshcroft, I.$$iChronopoulos, Dimitrios
000021559 8560_ $$ffischerc@itam.cas.cz
000021559 8564_ $$s438512$$uhttps://invenio.itam.cas.cz/record/21559/files/17000.pdf$$yOriginal version of the author's contribution as presented on CD, section: [RS28] Wave propagation
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000021559 962__ $$r21500
000021559 980__ $$aPAPER