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1.
International Applied Mechanics - A nonlinear elastic body with primary anisotropy is considered. It is assumed that the initial state of the body is equivalent to its natural state, while strains... 相似文献
2.
The Wiener-Hopf method is used to find a solution to a symmetric problem that gives a criterion for the onset of growth of
long shear cracks emanating from a corner point on the boundary of a hole and filled with a plastic material
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Translated from Prikladnaya Mekhanika, Vol. 42, No. 4, pp. 83–90, April 2006. 相似文献
3.
Florian J. Stadler Christian Piel Joachim Kaschta Sascha Rulhoff Walter Kaminsky Helmut Münstedt 《Rheologica Acta》2006,45(5):755-764
Linear high-density polyethylenes with molar masses M
w between 240 and 1,000,000 g/mol, obtained by metallocene catalysts, were characterized in shear using oscillatory and creep tests. The polydispersities of the molar mass distributions (MMDs) lay between 1 and 16. The resulting zero shear-rate viscosities η0 covered a range from 2.5×10−3 to around 108 Pas. Above a critical molar mass of M
c≈2,900 g/mol, the experimental results can be described by the relation η0 ∼ M
w3.6, independently of the MMD. The oscillatory data were fitted with a Carreau–Yasuda equation. The resulting parameters were correlated to molecular structure. The parameter a, being a quantity for the width of the transition between the Newtonian and the non-Newtonian regime, showed a dependence on the molar mass M
w but not on M
w/M
n. The parameter λ of the Carreau-Yasuda equation was found to be the reciprocal crossover frequency for all samples with a log-Gaussian MMD. λ depends on the molar mass M
w and also on M
w/M
n.
相似文献
Helmut MünstedtEmail: Phone: +49-9131-8527604Fax: +49-9131-8528321 |
4.
Peskov N. Yu. Ginzburg N. S. Kaminsky A. K. Sedykh S. N. Sergeev A. S. 《Radiophysics and Quantum Electronics》2021,63(12):931-975
Radiophysics and Quantum Electronics - We review the results of theoretical and experimental studies of high-power free-electron masers (FEMs), which are performed jointly by the Joint Institute... 相似文献
5.
Teobald Kupka Michał Stachów Jakub Kaminsky Stephan P. A. Sauer 《Magnetic resonance in chemistry : MRC》2013,51(8):482-489
A linear correlation between isotropic nuclear magnetic shielding constants for seven model molecules (CH2O, H2O, HF, F2, HCN, SiH4 and H2S) calculated with 37 methods (34 density functionals, RHF, MP2 and CCSD(T)), with affordable pcS‐2 basis set and corresponding complete basis set results, estimated from calculations with the family of polarization‐consistent pcS‐n basis sets is reported. This dependence was also supported by inspection of profiles of deviation between CBS estimated nuclear shieldings and shieldings obtained with the significantly smaller basis sets pcS‐2 and aug‐cc‐pVTZ‐J for the selected set of 37 calculation methods. It was possible to formulate a practical approach of estimating the values of isotropic nuclear magnetic shielding constants at the CCSD(T)/CBS and MP2/CBS levels from affordable CCSD(T)/pcS‐2, MP2/pcS‐2 and DFT/CBS calculations with pcS‐n basis sets. The proposed method leads to a fairly accurate estimation of nuclear magnetic shieldings and considerable saving of computational efforts. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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The Wiener–Hopf method is used to find the exact solution to the static symmetric plane problem of elasticity for a homogeneous
isotropic plate with a finite-length crack emerging from the point of intersection of two semi-infinite straight slip (dislocation)
lines. An expression for the crack-tip stress intensity factor is derived. Crack initiation is described by the Cottrell mechanism.
The equilibrium of the crack is analyzed for stability 相似文献