準(zhǔn)晶反平面中心裂紋問題的研究
[Abstract]:Quasicrystal is a new solid structure and new material discovered in the last twenty years. Compared with the classical crystal elastic problem, the quasicrystal elasticity problem is much more complicated. It not only has the phonon field, but also characterizes the phase subfield of the quasi periodic arrangement of atoms, and the coupling of the phonon field phase subfield. The research on the quasi crystal and the defect problem has been given by the predecessors. Solving methods, such as complex function method, Green function method, Fourier transformation method, perturbation method and finite difference method and so on. Compared with quasicrystal dynamics problems, the study of statics is a simple multi.Westergaard stress function method and Muskhelishvili method as two kinds of complex function methods for solving linear elastic fracture mechanics problems. The second chapter is divided into two parts. The first part is divided into two parts. The first part is the plane problem of the Dugdale model. Based on the viewpoint of the Dugdale, the semi infinite crack in the finite and long body in the plane elasticity is studied by the complex function method. From the physical plane to the unit circle of the mapping plane. By solving the function equation on the mapping plane, the stress intensity factor of the solid under the external load is obtained. At the same time, the cohesive zone size is obtained by the superposition principle. When the height of the long body tends to infinity, the results and the isotropic body knot in the classical elasticity are obtained. The second part is the Dugdale model in one dimension six square quasicrystals. By using the Muskhelishvili complex function method, the analytical solution of the size of the plastic zone of the crack tip and the tear displacement at the crack tip is obtained by combining the conformal transformation method. The results are in agreement with the results given by Fan by the dislocation model. This is a quasicrystal material. In the third chapter, the dynamic response of a three-dimensional quasicrystal with a central crack is studied by the finite difference method with the help of the quasicrystal fluid dynamics model. The theoretical and numerical analysis of the crack in the phonon field, the phase subfield and the phonon phase position coupling effect is given. Then the numerical solution of stress, displacement and normalized dynamic stress intensity factor is obtained. By comparing with the crystal results, the influence of the basic field of the phonon and phase bullets is highlighted, thus revealing their important position in the dynamic deformation of the quasicrystal.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O346.1
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