A Numerical Simulation Method for Generating 3D Damage Pattern
A technology of damage pattern and numerical simulation, applied in the field of numerical simulation, to achieve the effect of intuitive and real mechanical properties
Active Publication Date: 2019-02-15
BEIJING JIAOTONG UNIV
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Problems solved by technology
In the prior art, the commonly used description method of the damage pattern is to use the reaction-diffusion equation, but this method needs to assume various physical mechanisms first, and is an indirect method, and the generated damage pattern is different from the actual damage situation. gap
There is currently no direct method for generating 3D damage patterns of materials
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[0025] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0026] Those skilled in the ar...
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The invention provides a numerical simulation method for generating a three-dimensional damaged pattern. The method comprises the steps of establishing a three-dimensional geometric model for an object described in a three-dimensional damaged pattern, dissecting mesoscopic grids, setting a boundary condition, an initial condition and material parameters for the numerical simulation, selecting a yield surface with angular points, considering a strength-softening constitutive relationship and a non-associated flow rule, conducting the numerical simulation on the geometric model based on the finite-element dynamic relaxation method to get a solution, and outputting a three-dimensional damaged pattern. In this way, the three-dimensional damaged pattern can be generated directly based on a mechanical equation without the need of pre-assuming any physical mechanism. The above method provided in the invention is used for directly generating three-dimensional damaged patterns. Three-dimensional damaged patterns, generated based on the above method, can better reflect the actual damage situations of materials. Therefore, the mechanical performances of materials can be reflected more intuitively and more truly.
Description
technical field [0001] The invention belongs to the technical field of material numerical simulation, and in particular relates to a numerical simulation method for generating a three-dimensional damage pattern. Background technique [0002] For materials, especially for load-bearing solid materials, loading damage or fatigue damage is an important factor determining the life of materials. Pattern diagram is a non-uniform macroscopic structure diagram with certain regularity in space or time, and it is also a nonlinear macroscopic diagram for understanding and simulating the occurrence, development and end of material damage. The study of the growth process of material damage patterns has particularly important fundamental significance for understanding the breeding and occurrence mechanism of major engineering dynamic catastrophes. [0003] When the material is loaded, the solid material is damaged. Initially, the damage pattern describing the damage of the material is rou...
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IPC IPC(8): G06T17/00
Inventor 陈铁林刘晶晶台启民张中辉张良以程少振孔祥飞王杨
Owner BEIJING JIAOTONG UNIV