منابع مشابه
Inversion of Fracture Parameters by Using the Artificial Neural Network
A BPNN approach is developed to invert the fracture parameters from Thomsen parameters. A BPNN is trained by pairs of fracture parameters and Thomsen parameters which are calculated by a complex relationship. After training, the BPNN can emulate the inverted relationship between them and then to invert fracture parameters from Thomsen parameters. The results are encouraging. This BPNN approach ...
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In this paper, 2D boundary element stress analysis is carried out to obtain the T-stress for multiple internal edge cracks in thick-walled cylinders for a wide range of cylinder radius ratios and relative crack depth. The T-stress, together with the stress intensity factor K, provides amore reliable two-parameter prediction of fracture in linear elastic fracture mecha...
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This paper deals with the determination of the effect of varying material properties on the value of the stress intensity factors, KI and KII, for anisotropic plates containing cracks and subjected to a temperature change. Problems involving cracks and body forces, as well as thermal loads are analysed. The quadratic isoperimetric element formulation is utilized, and SIFs may be directly obtain...
متن کاملBorn Inversion by Wavefield Backpropagation
The inverse scattering problem for an acoustic medium is formulated by using the variable background Born approximation. A constant density acoustic medium is probed by a wide-band point source, and the scattered field is observed along a curved receiver array located outside the region where the medium velocity is different from the assumed background velocity function. The solution that we pr...
متن کاملInversion formula for inverse scattering within the Born approximation.
The problem of determining a localized scattering potential V(r) from its associated scattering amplitude f(s, s(0)) is addressed within the first Born approximation. The conventional methods, based on Fourier synthesis, for obtaining approximate solutions to the problem are reviewed briefly. A new reconstruction method is proposed that is in the form of an integral transform over the scatterin...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2010
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.2009.04484.x