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A Method for Solving Nonlinear Mechanics Problems of Continuum Components Using 3D Discrete Solids

A nonlinear and component technology, applied in the field of 3D discrete solid element method and 3D discrete element calculation and simulation, can solve the problems that the calculation accuracy is not as good as the finite element method, restrict the application of discrete element method, etc., and achieve the effect of simple and clear calculation process

Active Publication Date: 2020-10-02
SOUTHEAST UNIV
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Problems solved by technology

However, the calculation accuracy of the traditional discrete element method is far inferior to that of the finite element method when calculating the continuum problem, and the parameters reflecting the force relationship of the unit often need to be determined through experiments, which seriously restricts the application of the discrete element method.

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  • A Method for Solving Nonlinear Mechanics Problems of Continuum Components Using 3D Discrete Solids
  • A Method for Solving Nonlinear Mechanics Problems of Continuum Components Using 3D Discrete Solids
  • A Method for Solving Nonlinear Mechanics Problems of Continuum Components Using 3D Discrete Solids

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Embodiment Construction

[0055] In linear elastic mechanics, since the structural displacement is assumed to be small and the relationship between load and displacement is linear, the solution value of the equilibrium equation based on the position before deformation can meet the engineering accuracy requirements. However, when the structure is deformed greatly, the large deformation causes second-order or higher-order effects, the relationship between load and displacement is nonlinear, and the structural stiffness changes significantly. The balance equation must be established in the deformed state. In the discrete element method, there is no constraint of deformation coordination conditions between the elements, and the dynamic relaxation method is used to solve the problem. The position of the element is updated with the increase of the calculation time step, and is used to calculate the internal force of the next time step. Therefore, the discrete element method can effectively consider Higher-ord...

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Abstract

The invention discloses a method for solving a nonlinear mechanics problem of a continuous medium member by applying a three-dimensional discrete entity. For the limitation of a conventional discrete unit method for calculating a continuous medium problem, discrete element models of two three-dimensional discrete entities are built by taking energy equivalence as a principle based on a mechanics theory of a continuous medium; by adding a contact spring between particle units, the Poisson ratio effect of a material is reflected; and an analytic relationship between a mesoscopic model parameter (spring stiffness) and macroscopic elastic constants (an elastic modulus and a Poisson ratio) is derived, so that a great breakthrough is achieved in simulation of the continuous medium with a large Poisson ratio in PFC software. In addition, a plastic part is added in a contact constitutive equation between the particle units. According to the method, the elastic-plastic problem of the continuous medium can be effectively subjected to simulative calculation analysis by adopting a discrete entity unit method; and the method is suitable for nonlinear mechanics problems of large deformation, damage fracture, collapse destruction and the like of a structure or the member.

Description

technical field [0001] The invention relates to a three-dimensional discrete element calculation and simulation method, in particular to a three-dimensional discrete solid element method for simulating continuous media, which is used to solve nonlinear mechanical problems such as large deformation, damage, fracture, and collapse of structures or components, and belongs to limited The field of meta-analysis techniques. Background technique [0002] The traditional finite element method has some difficulties in simulating steel structures, such as fabricated nodes: contact pairs need to be set for the surface-to-surface contact between bolts and nodes, stress concentration is likely to occur at the bolts during the actual loading process, and mesh division during simulation When densification is required, large deformation of the rod will lead to non-convergence and fracture. Therefore, it is necessary to find new numerical analysis methods. [0003] Since the discrete eleme...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F30/20G06F2119/06
Inventor 冯若强王斯妮
Owner SOUTHEAST UNIV
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