A fine scale drift wave mode possessing unusually high frequency 2-3 MHz and radial wave number is observed using the correlative upper hybrid resonance backscattering technique at the FT-2 tokamak under conditions when the ETG mode should be unstable. The radial wave number spectrum of turbulence is measured and shown to be maximal at values 120-170 cm −1 corresponding to the largest ETG instability growth rate.

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347ChemInform Abstract (185 refs. from 1908 to 1983).

Since the delamination induced failure of a laminated smart structure always occurs under the action of mechanical and electrical fields, a generalized two-dimensional model for a piezoelectric/elastic laminate is established in order to analyze the effect of an applied electric field on its delamination. First, based on the double Fourier series method, a general analytical solution of the mid-plane displacement is derived for any boundary condition. Furthermore, the energy release rate is employed to study the influence of the applied electric field and mechanical loading on the fracture characteristics of the piezoelectric/elastic laminate. The energy release rates for modes I and II fracture behavior of the PZT/elastic laminates are calculated in detail. Such calculations indicate that it is feasible to choose not only suitable material properties of the piezoelectric and elastic layers, but also their thicknesses, to improve the smart structure's fracture strength within a specified range.

No abstract