Load uncertainty-based material structure multi-scale topological optimization design method

An uncertainty, material structure technology, applied in the field of multi-scale topology optimization design of material structure based on load uncertainty, to reduce complexity and improve computational efficiency

Active Publication Date: 2021-02-26
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

[0003] The existing multi-scale topology optimization design method for material structures considers deterministic load cases, that is, the magnitude and direction of the load are determined, but there are unavoidable load uncertainties in actual engineering

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  • Load uncertainty-based material structure multi-scale topological optimization design method
  • Load uncertainty-based material structure multi-scale topological optimization design method
  • Load uncertainty-based material structure multi-scale topological optimization design method

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in this embodiment. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] refer to figure 1 As shown, the present invention provides a multi-scale topology optimization design method for material structures based on load uncertainty, comprising the following steps:

[0047]S1. Define the design domain, give the initial test strain conditions, set the size, boundary conditions, material parameters and uncertain load size and direction parameters of the macrostructure and material microstructure, set the filter radius of the design variables, and set ...

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Abstract

The invention provides a load uncertainty-based material structure multi-scale topological optimization design method, which comprises the following steps of defining a design domain, initializing design parameters, sequentially performing finite element analysis on a microstructure and a macrostructure of a material, calculating an expected value and a variance of the flexibility of the structureby adopting a perturbation method, constructing a material structure multi-scale topological optimization model based on load uncertainty, performing sensitivity analysis, correcting an objective function and constraint sensitivity by using a mapping filtering method, updating a design variable by using an OC algorithm, judging whether a convergence criterion is met or not, and finally outputtinga macroscopic topological structure and a material microstructure topological structure. According to the method, the first-order perturbation method is adopted to quantize the uncertain load, the complexity of statistical index calculation is effectively reduced, the calculation efficiency is improved, the multi-scale robustness topological optimization design of a macrostructure and a materialmicrostructure is achieved, and the obtained periodic multi-space composite material structure has better robustness.

Description

technical field [0001] The invention relates to the related technical field of multi-scale optimization design of material structure, in particular to a multi-scale topology optimization design method of material structure based on load uncertainty. Background technique [0002] In order to meet the needs of modern industrial products for "ultra-lightweight structure", "specialized function" and "integrated performance", multi-scale topology optimization design of material structure is carried out by considering material microstructure optimization and macrostructure optimization at the same time, to obtain the optimal The multi-scale design of the microstructure and macrostructure of the material obtains a periodic multi-void composite material structure; it has excellent mechanical properties such as high specific stiffness, high specific strength, and energy absorption, and is widely used in aerospace, automotive, and construction industries. field. [0003] The existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/26
CPCG06F30/20G06F2113/26Y02P90/30
Inventor 占金青孙宇李翼丰蒲圣鑫刘敏尹来容
Owner EAST CHINA JIAOTONG UNIVERSITY
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