Three-dimensional random aggregate grid mapping division method based on Comsol Multiphysics

Abstract

The invention relates to a Comsol Multiphysics-based three-dimensional random aggregate grid mapping division method. The method comprises the following steps: establishing representative volume elements used for representing concrete blocks; performing grid mapping operation on the representative volume element to obtain a grid mapping division result; performing type judgment operation on each grid unit in the grid mapping division result one by one to obtain a grid unit type of each grid unit; according to the grid cell type of each grid cell, endowing each grid cell with a material performance parameter one by one; and outputting a grid mapping division result as a result. According to the method, the defect that the assignment judgment of the Comsol Multiphysics on the material attributes is directly carried out based on a geometric domain and cannot be carried out aiming at each unit is overcome, and the purpose of carrying out grid mapping division on the concrete mesoscopic random aggregate model in the Comsol Multiphysics is achieved; the simulation calculation precision of the random aggregate grid division technology is greatly improved, and various complex actual conditions can be simulated.

Description

technical field [0001] The invention relates to the technical field of numerical simulation calculation of concrete materials, in particular to a three-dimensional random aggregate grid mapping method based on ComsolMultiphysics. Background technique [0002] Concrete is the most commonly used construction engineering material, and its mechanical properties, material durability and failure characteristics under ultimate stress state are worthy of further study. As an important supplement to experimental research, finite element numerical simulation calculation is an important means to study material properties and an important method to explore the behavior mechanism of materials. The development of efficient and reliable numerical calculation methods is an important research direction for the study of the mechanical behavior mechanism of concrete materials. [0003] In recent years, mesomechanics theory has become an important theory for studying the mechanical characteris...

AI Technical Summary

Problems solved by technology

[0005] Due to the weak multi-field coupling calculation ability of Ansys or Abques, the simulation calculation accuracy of all Ansys or Abques random aggregate meshing techniques is generally not high, and it is impossible to simulate various complex actual situations;

[0006] On the other hand, although the Comsol Multiphysics finite element software has the ability to deal with multi-field coupling calculations that Ansys or Abques does not have, the following defects restrict the numerical simulation of Comsol Multiphysics in the grid mapping division of the concrete mesoscopic random aggregate model Computational applications:

[0007] Since Comsol Multiphysics' assignment judgment of material properties is directly based on the geometric domain, it cannot be executed for each unit, so it is impossible to mesh the mesoscopic random aggregate model of concrete

[0008] To sum up, to solve the problem that Comsol Multiphysics assigns and judges material properties directly based on the geometric domain, Comsol Multiphysics can be applied to the concrete mesoscopic random aggregate model for grid mapping and division, thereby solving the problem of prior art simulation calculations. The accuracy is generally not high, and it is impossible to simulate various complex actual situations

Images