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The nonlinear response of rectangular and square metallic plates subjectto transverse harmonic excitations is studied. The nonlinearitiesoriginate from the use of Von Kármán strains. The method of multiplescales is used to solve the system of differential equationsapproximately. Frequency response curves are presented for both squareand rectangular plates for primary resonance of either mode in thepresence of a one-to-one internal resonance. Stability of steady statesolutions is investigated. Bifurcation points and their types arediscussed. 相似文献
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α-Hemihydrate was allowed to hydrate
in the presence of tartaric, succinic, malic or citric acids at room temperature
at a water/ binder ratio of 0.35. Hydration of hemihydrate leading to the
crystallisation of calcium sulphate dihydrate is an exothermic process. The
temperature rise during hydration was measured as a function of time using
a semi-adiabatic method. The temperature rise–time curves are similar
for all investigated systems but with different induction period. The results
showed that calcium sulphate dihydrate crystallisation is a nucleation controlled
process and different acids are chemisorbed at the surface of forming nuclei
to different extent. Processes taking place during nucleation may control
the morphology of resultant crystals. Infrared spectral and differential scanning
calorimetric studies confirmed the adsorption of carboxylic acids at the surface
of dihydrate crystals. 相似文献
3.
Volume Contents
Volume Contents 相似文献
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