The fine-scale heterogeneity of granular material is characterized by its polydisperse microstructure with randomness and no periodicity. To predict the mechanical response of the material as the microstructure evolve...The fine-scale heterogeneity of granular material is characterized by its polydisperse microstructure with randomness and no periodicity. To predict the mechanical response of the material as the microstructure evolves, it is demonstrated to develop computational multiscale methods using discrete particle assembly-Cosserat continuum modeling in micro- and macro- scales,respectively. The computational homogenization method and the bridge scale method along the concurrent scale linking approach are briefly introduced. Based on the weak form of the Hu-Washizu variational principle, the mixed finite element procedure of gradient Cosserat continuum in the frame of the second-order homogenization scheme is developed. The meso-mechanically informed anisotropic damage of effective Cosserat continuum is characterized and identified and the microscopic mechanisms of macroscopic damage phenomenon are revealed. c 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi： 10.1063/2.1301101]展开更多
Coordination-driven supramolecular(CDS)syntheses between the pre-assembled tetrametallic flexible precursor A and pseudo-halide dicyanamide N(CN)_(2)−(DCM)and azido N_(3)^(−)ions afforded selectively the discrete Cu_(...Coordination-driven supramolecular(CDS)syntheses between the pre-assembled tetrametallic flexible precursor A and pseudo-halide dicyanamide N(CN)_(2)−(DCM)and azido N_(3)^(−)ions afforded selectively the discrete Cu_(8)assembly D and the one-dimensional coordination polymer E,respectively.Upon the reaction of E with M’(II)salts(M’=Cu,Zn,Cd),straightforward self-dissociation/re-organisation processes take place yielding new discrete Cu_(8)assemblies F_(M)’.Preservation in a solution of polymetallic Cu(I)CDS assemblies is evidenced for the first time.Solid-state luminescence properties of these derivatives are reported,revealing that D is a moderate room temperature luminophore upon UV-vis light excitation(emission quantum yield of 13%)while derivatives E,F_(Zn)and F_(Cd)are only weakly luminescent in the solidstate at low temperature.展开更多
基金supported by the National Natural Science Foundation of China(11072046,10672033,90715011 and 11102036)the National Basic Research and Development Program(973Program,2010CB731502)
文摘The fine-scale heterogeneity of granular material is characterized by its polydisperse microstructure with randomness and no periodicity. To predict the mechanical response of the material as the microstructure evolves, it is demonstrated to develop computational multiscale methods using discrete particle assembly-Cosserat continuum modeling in micro- and macro- scales,respectively. The computational homogenization method and the bridge scale method along the concurrent scale linking approach are briefly introduced. Based on the weak form of the Hu-Washizu variational principle, the mixed finite element procedure of gradient Cosserat continuum in the frame of the second-order homogenization scheme is developed. The meso-mechanically informed anisotropic damage of effective Cosserat continuum is characterized and identified and the microscopic mechanisms of macroscopic damage phenomenon are revealed. c 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi： 10.1063/2.1301101]
基金supported by the French Research Ministry and the CNRSThe ANR projects SMAC and SUPRALUM and the LIA Cluspom are acknowledgedthe“Grandéquipement national de calcul intensif(GENCI)”through HPC resources of CINES,TGCC and IDRIS(grants 2020/2021-A0080800649/A0100800649).
文摘Coordination-driven supramolecular(CDS)syntheses between the pre-assembled tetrametallic flexible precursor A and pseudo-halide dicyanamide N(CN)_(2)−(DCM)and azido N_(3)^(−)ions afforded selectively the discrete Cu_(8)assembly D and the one-dimensional coordination polymer E,respectively.Upon the reaction of E with M’(II)salts(M’=Cu,Zn,Cd),straightforward self-dissociation/re-organisation processes take place yielding new discrete Cu_(8)assemblies F_(M)’.Preservation in a solution of polymetallic Cu(I)CDS assemblies is evidenced for the first time.Solid-state luminescence properties of these derivatives are reported,revealing that D is a moderate room temperature luminophore upon UV-vis light excitation(emission quantum yield of 13%)while derivatives E,F_(Zn)and F_(Cd)are only weakly luminescent in the solidstate at low temperature.
