Design method of chiral metamaterial structure with predetermined negative Poisson's ratio characteristic
A technology of chiral metamaterials and design methods, applied in design optimization/simulation, computer material science, genetic rules, etc., can solve problems such as low efficiency, poor reconfigurability, and unsatisfactory stability, so as to improve work efficiency and better CAD reconfigurability, effect of saving design time
Active Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
View PDF3 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The technical problem solved by the present invention is to overcome the inefficiency of the existing negative Poisson's ratio mechanical metamaterial design method, the poor reconfigurability of CAD and the inability to meet the stable negative Poisson's ratio under large deformation. The present invention provides a A novel chiral metamaterial and its design method
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment
[0042] Specific embodiments: a novel chiral negative Poisson's ratio metamaterial and its design method. Negative Poisson's ratio metamaterials have a counterintuitive property that differs from conventional materials in that they can expand (shrink) in the transverse direction when stretched (compressed) in the longitudinal direction. see figure 1 , the negative Poisson’s ratio mechanical metamaterial unit cell design configuration flow chart in the example of the present invention, on the basis of the density method topology optimization configuration, select the design variables for the configuration reconstruction for shape optimization design, and obtain the chiral negative Poisson's ratio metamaterial structure.
[0043] Step 1. Write a program for calculating the equivalent Poisson's ratio of the periodic microstructure in MATLAB.
[0044] The invention adopts the representative volume unit cell method to carry out the finite element analysis of the equivalent Poisson...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a novel chiral negative Poisson's ratio metamaterial and a design method thereof, and aims to automatically and quickly perform structural design of a mechanical metamaterialaccording to specific negative Poisson's ratio requirements, so as to get rid of the conventional experience design thought, improve the working efficiency and save the design time. The optimized configuration can keep a preset negative poisson ratio under large deformation, and can better meet the application scenarios where certain structures may deform greatly; and through further cubic splinecurve shape optimization design, the optimized configuration has better CAD reconfigurability, a real object can be directly manufactured through 3D printing, and wider engineering practical application prospects are achieved.
Description
technical field [0001] The invention belongs to the field of structural design of mechanical metamaterials, and in particular relates to a method for structural design of novel negative Poisson's ratio metamaterials through topology optimization and shape optimization. Background technique [0002] Mechanical metamaterials are artificial microstructures with special mechanical properties, whose mechanical properties mainly depend on the geometric structure of "artificial atoms or molecules" rather than their material components. Typical mechanical metamaterials are usually related to four elastic constants, which are Poisson's ratio, Young's modulus, shear modulus, and bulk modulus. According to the different elastic constants, mechanical metamaterials can be classified into negative Poisson's ratio bulging materials, shear modulus blanking five-mode anti-expansion materials, negative compressibility materials, negative thermal expansion materials, mode conversion adjustable...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G06F30/23G06F30/27G06F30/10G06N3/12G16C10/00G16C60/00G06F111/06G06F119/14
CPCG06F30/23G06F30/27G06F30/10G06N3/126G16C10/00G16C60/00G06F2111/06G06F2119/14Y02T90/00
Inventor 邱克鹏谢振朋王若尧朱继宏张卫红
Owner NORTHWESTERN POLYTECHNICAL UNIV