CN-121590026-B - Continuous fiber periodic structure path planning method and device based on lamination

CN121590026BCN 121590026 BCN121590026 BCN 121590026BCN-121590026-B

Abstract

The application discloses a continuous fiber periodic structure path planning method and device based on lamination, wherein the method comprises the steps of determining the configuration of a selected periodic unit structure according to a first preset rule, dividing units in a design domain based on the unit structure, arranging and combining the unit structure based on all units in the design domain, determining the connection relation between nodes of the configuration of all the unit structures in the design domain based on a preset minimum distance, establishing an adjacent matrix representing the node connection relation, and planning a path according to a second preset rule based on the adjacent matrix, an initial node and a traversing direction to obtain a continuous fiber periodic unit structure path based on lamination. The application can realize path planning of the periodic structure formed by the complex unit cell types and the periodic unit cell structure formed by the combination of different unit cell types, and reduces structural defects caused by fiber dislocation when the periodic structure is printed in a 3D way by combining the composite material lamination thought.

Inventors

FENG PENGCHENG
JIA DONGSHENG
ZHU JIHONG

Assignees

西北工业大学

Dates

Publication Date: 20260508
Application Date: 20260128

Claims (7)

1. A ply-based continuous fiber periodic structure path planning method, comprising: Determining the configuration of a selected periodic unit cell structure according to a first preset rule; Dividing units in a design domain based on the size of the unit cell structure, and performing arrangement and combination treatment on the unit cell structure based on all units in the design domain; Determining connection relations among nodes of the configuration of all unit cell structures in the design domain based on a preset minimum distance, and establishing an adjacent matrix representing the connection relations of the nodes; Based on the adjacency matrix, the initial node and the traversing direction, planning a path according to a second preset rule to obtain a continuous fiber periodic unit structure path based on lamination; the path planning is performed according to a second preset rule based on the adjacency matrix, the initial node and the traversing direction to obtain a continuous fiber periodic unit structure path based on lamination, and the method comprises the following steps: Based on the adjacency matrix, the initial node and the traversing direction, gradually inserting a loop through a Hill Hall algorithm; when the node is a multipath intersection, judging the multipath intersection through an optimization strategy, and determining a path track based on the judged candidate node; wherein the optimization strategy comprises: extracting a node with the minimum angle change as a next step of traversing node; Judging the positions of the rest nodes relative to the paths of the next step of traversing nodes; If the rest nodes are not on one side of the path of the next step of traversing nodes, taking the next step of traversing nodes as path candidate nodes, and executing the optimization strategy again; If the rest nodes traverse one side of the path of the node in the next step, executing the optimization strategy again; The path planning is performed according to a second preset rule based on the adjacency matrix, the initial node and the traversing direction to obtain a continuous fiber periodic unit structure path based on lamination, and the method further comprises the following steps: Providing a defect of the unit cell structure, the defect comprising: one cross-point connects three nodes of 3 paths, and/or, One intersection connects four nodes of 4 paths; Further comprises: traversing all nodes based on the node sequence of the path track to determine the number of defects of the unit cell structure; adjusting the initial node and/or the traversing direction of the path track to eliminate the defect; Stopping traversing when the defects are completely eliminated and/or the number of times of traversing reaches a preset number of times, and obtaining a final path track; And carrying out lamination treatment on the final path track to obtain the continuous fiber periodic unit cell structure path based on lamination.
2. The ply-based continuous fiber periodic structure path planning method of claim 1, wherein the first preset rule comprises: the width of all sides in the unit cell structure is set to be a fixed fiber spacing or even times of the fixed fiber spacing; the unit cell structure is Euler diagram; All the nodes of the unit cell structure after random combination are connected with each other.
3. The ply-based continuous fiber periodic structure path planning method of claim 1, wherein the dividing cells within a design domain based on the dimensions of the unit cell structure comprises: Determining the size of the unit cell structure; dividing the units in the design domain based on the size, and numbering the divided units.
4. The ply-based continuous fiber periodic structure path planning method of claim 3, wherein said arranging and combining said unit cell structures based on all units within said design domain comprises: based on all units in the design domain, arranging and combining the unit cell structures according to a rule of excluding a checkerboard; performing connectivity checking and repairing treatment on the arranged and combined single cell structures; the arrangement and combination of the unit cell structures passing the connectivity check and repair process are determined as the final arrangement and combination.
5. The method for planning a path of a continuous fiber periodical structure based on a laminate according to claim 4, wherein said performing connectivity check and repair treatment on said unit cell structure after arrangement and combination comprises: traversing the unit of the unit cell structure based on the arrangement and combination of the unit cell structure, and extracting all adjacent units filling the unit cell structure; dividing quadrant regions of surrounding space by taking a unit filled with the unit cell structure as a center; And if the three adjacent units in at least one quadrant area are all units filling the unit cell structure, judging that the unit cell structure filling unit cell structure meets connectivity, otherwise, refilling the unit cell structure into the unit cell, and performing connectivity checking and repairing again.
6. The ply-based continuous fiber periodic structure path planning method of claim 1, wherein the determining connection relationships between nodes of the configuration of all unit structures within the design domain based on a preset minimum distance and establishing an adjacency matrix representing the node connection relationships comprises: When the distance between the nodes of the configuration of the unit cell structure is smaller than or equal to the preset distance, judging that the nodes are in a connection relationship; numbering the nodes, and establishing an N multiplied by N adjacency matrix based on the numbering, wherein N is a natural number; When the node i is connected with the node j, the element values of the ith row, the jth column and the jth row, the jth column of the adjacent matrix are 1; and when the node i and the node j are not connected with each other, the elements of the ith row, the jth column and the jth row, the jth column of the adjacent matrix are valued as 0.
7. A ply-based continuous fiber periodic structure path planning apparatus comprising a processor, a memory, and program instructions stored on the memory that, when executed by the processor, implement the ply-based continuous fiber periodic structure path planning method of any one of claims 1-6.

Description

Continuous fiber periodic structure path planning method and device based on lamination Technical Field The application relates to the technical field of 3D printing of continuous fiber reinforced composite materials, in particular to a continuous fiber periodic structure path planning method and device based on lamination. Background Due to the performance characteristics of light weight, high strength and strong energy absorption capacity of the periodic unit cell structure, the periodic unit cell structure is widely used as a bearing part and an energy absorber in the form of a sandwich structure and a thin-wall structure, and has great application potential in various industrial fields of aerospace, automobiles, buildings and the like. With the advent of 3D printing continuous fiber composite technology, many researchers have developed studies on the design of continuous fiber periodic unit cell structures and path trajectory designs. Most of the current research is to develop path trajectory design around a single type of honeycomb structure and to complete printing work such as hexagons, diamonds, rectangles, circles, etc., to further improve the mechanical properties of the structure by changing the arrangement and orientation of the continuous fibers. However, there is still a lack of research on the design and path planning direction of periodic structures composed of complex unit cell types and periodic unit cell structures composed of different unit cell types. In planning the path of a periodic structure of continuous fibers, further research and study is still needed to reduce structural defects caused by fiber dislocations while considering manufacturing constraints such as print width and one stroke design. The foregoing description is provided for general background information and does not necessarily constitute prior art. Disclosure of Invention Aiming at the defects in the prior art, the embodiment of the application solves the problems that in the prior art, the periodic structure formed by complex unit cell types and the periodic unit cell structure formed by different unit cell types are subjected to path planning while considering manufacturing constraints such as printing width, stroke design and the like by providing the continuous fiber periodic structure path planning method and device based on lamination, and reduces the structural defects caused by fiber dislocation when the periodic structure is printed in 3D by combining the composite material lamination idea. In a first aspect, an embodiment of the present application provides a method for planning a path of a continuous fiber periodic structure based on a laminate, including: Determining the configuration of a selected periodic unit cell structure according to a first preset rule; Dividing units in a design domain based on the size of the unit cell structure, and performing arrangement and combination treatment on the unit cell structure based on all units in the design domain; Determining connection relations among nodes of the configuration of all unit cell structures in the design domain based on a preset minimum distance, and establishing an adjacent matrix representing the connection relations of the nodes; and planning a path according to a second preset rule based on the adjacency matrix, the initial node and the traversing direction to obtain a continuous fiber periodic unit structure path based on lamination. Preferably, the first preset rule includes: the width of all sides in the unit cell structure is set to be a fixed fiber spacing or even times of the fixed fiber spacing; the unit cell structure is Euler diagram; All the nodes of the unit cell structure after random combination are connected with each other. Preferably, the dividing the units in the design domain based on the size of the unit cell structure includes: Determining the size of the unit cell structure; dividing the units in the design domain based on the size, and numbering the divided units. Preferably, the arranging and combining the unit cell structures based on all units in the design domain includes: based on all units in the design domain, arranging and combining the unit cell structures according to a rule of excluding a checkerboard; performing connectivity checking and repairing treatment on the arranged and combined single cell structures; the arrangement and combination of the unit cell structures passing the connectivity check and repair process are determined as the final arrangement and combination. Preferably, the connectivity checking and repairing process for the unit cell structure after arrangement and combination comprises: traversing the unit of the unit cell structure based on the arrangement and combination of the unit cell structure, and extracting all adjacent units filling the unit cell structure; dividing quadrant regions of surrounding space by taking a unit filled with the unit cell structure as a center; And if the thr