Thermal residual stress/strain field in the vicinity of interface in the thin foil specimen of a whisker reinforced metallic composite was studied with 3--dimensional finite element method (3-D FEM) for the first time...Thermal residual stress/strain field in the vicinity of interface in the thin foil specimen of a whisker reinforced metallic composite was studied with 3--dimensional finite element method (3-D FEM) for the first time. The stress/strain distribution across the interface between the whisker and the matrix shows that the thermal stress/strain field in the matrix extends to a large area from the interface. The effect of surface relaxation on the strain/stress was investigated. The displacement field calculated with 3-D FEM was used in the simulation of LACBED pattern. Good fit was found between the simulated pattern and the experimental one.展开更多
The procedure of simulating convergent beam electron diffraction (CBED) pattern of quasicrystals by dynamical theory is described. The simulated patterns are generally coincide with the experimental patterns. The var...The procedure of simulating convergent beam electron diffraction (CBED) pattern of quasicrystals by dynamical theory is described. The simulated patterns are generally coincide with the experimental patterns. The variations of intensity distribution in CBED pattern with the amplitude and phase of the structure factor of quasicrystal are calculated with dynamical theory. The sensitivity of intensity distribution to the structure factor is investigated.展开更多
基金the National Natural Science Foundation of China!59471070
文摘Thermal residual stress/strain field in the vicinity of interface in the thin foil specimen of a whisker reinforced metallic composite was studied with 3--dimensional finite element method (3-D FEM) for the first time. The stress/strain distribution across the interface between the whisker and the matrix shows that the thermal stress/strain field in the matrix extends to a large area from the interface. The effect of surface relaxation on the strain/stress was investigated. The displacement field calculated with 3-D FEM was used in the simulation of LACBED pattern. Good fit was found between the simulated pattern and the experimental one.
基金the National Natural Science Foundation of China!59871034
文摘The procedure of simulating convergent beam electron diffraction (CBED) pattern of quasicrystals by dynamical theory is described. The simulated patterns are generally coincide with the experimental patterns. The variations of intensity distribution in CBED pattern with the amplitude and phase of the structure factor of quasicrystal are calculated with dynamical theory. The sensitivity of intensity distribution to the structure factor is investigated.
