The invention discloses a complete buckling two-dimensional
dynamic simulation method of a
submarine pipeline provided with initial defects introduced with a
modal method. The method comprises the steps as follows:
finite element software ABAQUS is applied according to geometric parameters and physical and mechanical parameters of the
submarine pipeline, and a characteristic buckling mode of the
submarine pipeline is computed; the
finite element software ABAQUS is applied according to geometric parameters and physical
mechanics of the
submarine pipeline and
seabed soil mass, and a model used for dynamic buckling analysis is rebuilt, and the initial defects of the
submarine pipeline are introduced; and a complete dynamic buckling process of the
submarine pipeline is analyzed with an explicit
dynamic method. According to the complete buckling two-dimensional
dynamic simulation method, a slender submarine pipeline structure can be effectively simulated; moreover, completely smooth initial defects are introduced,
stress concentration is prevented, and simultaneously, a plurality of
modes of the submarine pipeline are introduced in an overlapping manner, so that the purpose of simulating the initial defects in the real high-order mode can be achieved; and further, the dynamic change process of the submarine pipeline in the high temperature and the
high pressure can be simulated, good astringency is provided for complete buckling computation of the submarine pipeline, and a computation result can reflect the real condition better.