Accession Number : ADP001732

Title :   Fracture Diagnosis in Structures Using Circuit Analogy,


Personal Author(s) : Akgun,Mehmet ; Ju,Frederick J. ; Paez,Thomas L.

Report Date : MAY 1983

Pagination or Media Count : 5

Abstract : The paper uses the Kirchloff's equations for the T- and II-circuits to analogously simulate the beam vibration. Structures formed by straight beam segments can then be simulated by electrical meshes formed by T- or II-circuits. In the paper the analogous circuits are also developed for the cracked beams. The natural frequencies of the circuits thus yields the natural frequencies of circuits thus yields the natural frequencies of the structures with or without crack. In the inverse application, the change in frequencies leads to the location and assessment of the fracture damage of the structure. The paper developed, specifically for the II-circuit, a formalization of establishing the characteristic matrices. The standardized format makes it possible for adaptation to computer programming. An estimate of the algorithm is included for comparison of its advantage in the speed of computation. (Author)

Descriptors :   *Fracture(Mechanics), *Structural analysis, *Beams(Structural), *Circuit analysis, *Analogies, Symposia, Equations, Vibration, Simulation, Electrical properties, Mesh, Cracks, Resonant frequency, Damage assessment, Matrices(Mathematics), Algorithms, Estimates

Distribution Statement : APPROVED FOR PUBLIC RELEASE