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Influence of Hydrostatic Pressure on FLDs for AZ31B Sheets
H. Wang,Y. Wu,P.D. Wu,K.W. Neale 한국소성가공학회 2011 기타자료 Vol.2011 No.8
Sheet metal formability in terms of the Forming Limit Diagram (FLD) for magnesium alloy AZ31B sheets is studied by using the recently developed Elastic Visco-Plastic Self-Consistent (EVPSC) model, in conjunction with the classical M-K approach. The effect of superimposed hydrostatic pressure on FLDs is numerically assessed. It is found that the superimposed pressure delays the initiation of necking for any strain path. The increment of formability becomes significant when the pressure is larger than about half the initial tensile yield stress of the sheet metal. The difference in predicted FLDs between that with a superimposed hydrostatic pressure and that with a stress component normal to the sheet plane is also discussed.
Size-dependent vibronic coupling in α-Fe<sub>2</sub>O<sub>3</sub>
O'Neal, K. R.,Patete, J. M.,Chen, P.,Holinsworth, B. S.,Smith, J. M.,Lee, N.,Cheong, S.-W.,Wong, Stanislaus S.,Marques, C.,Aronson, M. C.,Musfeldt, J. L. American Institute of Physics 2014 The Journal of chemical physics Vol.141 No.4
<P>We report the discovery of finite length scale effects on vibronic coupling in nanoscale alpha-Fe2O3 as measured by the behavior of vibronically activated d-d on-site excitations of Fe3+ as a function of size and shape. An oscillator strength analysis reveals that the frequency of the coupled symmetry-breaking phonon changes with size, a crossover that we analyze in terms of increasing three-dimensional character to the displacement pattern. These findings demonstrate the flexibility of mixing processes in confined systems and suggest a strategy for both enhancing and controlling charge-lattice interactions in other materials. (C) 2014 AIP Publishing LLC.</P>