000013179 001__ 13179
000013179 005__ 20161114160330.0
000013179 04107 $$aeng
000013179 046__ $$k2009-06-22
000013179 100__ $$aLeiderman, R.
000013179 24500 $$aComputing the interaction between ultrasonic waves and non-homogeneous adhesion interfaces in layered plates

000013179 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013179 260__ $$bNational Technical University of Athens, 2009
000013179 506__ $$arestricted
000013179 520__ $$2eng$$aIt is known that the global strength of multi-layered composite structures strongly depends on the quality of the adhesion between its constituent elements. Imperfections along adhesion interfaces can effectively compromise structure’s performance. The characterization of such defects is a very difficult task and the development of a reliable nondestructive evaluation is still an open task. In that sense, the main goal of this study is the development of an analytic-numerical method to compute the acoustic field resulting from the interaction of ultrasonic waves and imperfect interfaces, helping in selection of parameters for ultra-sonic inspecting methods. Such a problem presents several modeling challenges: capturing the disparate length scales in the problem, developing a technique which is both numerically stable and efficient at high frequencies and modeling the adhesive layer itself. The broad range of physical dimensions makes the problem ill-suited to standard domain discretization computational modeling procedures. Here, the adhesion interfaces are modeled by appropriated boundary conditions corresponding to the Quasi-Static Approximation. (QSA) [1], which represents interfaces by equivalent distributions of normal and transversal springs. Local defects are represented by local changes in the spring constants. Two solution methods are presented.

000013179 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013179 653__ $$aAdhesion Interfaces, Ultrasonic Waves, Perturbation Method, Invariant Imbedding Method, Optimization Abstract. It is known that the global strength of multi-layered composite structures strongly depends on the quality of the adhesion between its constituent elements. Imperfections along adhesion interfaces can effectively compromise structure’s performance. The characterization of such defects is a very difficult task and the development of a reliable nondestructive evaluation is still an open task. In that sense, the main goal of this study is the development of an analytic-numerical method to compute the acoustic field resulting from the interaction of ultrasonic waves and imperfect interfaces, helping in selection of parameters for ultra-sonic inspecting methods. Such a problem presents several modeling challenges: capturing the disparate length scales in the problem, developing a technique which is both numerically stable and efficient at high frequencies and modeling the adhesive layer itself. The broad range of physical dimensions makes the problem ill-suited to standard domain discretization computational modeling procedures. Here, the adhesion interfaces are modeled by appropriated boundary conditions corresponding to the Quasi-Static Approximation. (QSA) [1], which represents interfaces by equivalent distributions of normal and transversal springs. Local defects are represented by local changes in the spring constants. Two solution methods are presented. 1

000013179 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013179 720__ $$aLeiderman, R.$$iCastello D., A.$$iBarra J., C.$$iRochinha F., A.$$iBarbone P., E.$$iBraga A. M., B.
000013179 8560_ $$ffischerc@itam.cas.cz
000013179 8564_ $$s237178$$uhttps://invenio.itam.cas.cz/record/13179/files/CD235.pdf$$yOriginal version of the author's contribution as presented on CD, section: Computational methods for waves - ii (MS).
000013179 962__ $$r13074
000013179 980__ $$aPAPER