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Laying spreading method for composite material

A composite material and layering technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low efficiency, poor dimensional accuracy, and low material utilization.

Inactive Publication Date: 2013-01-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When laying and blanking traditional composite materials, simple parts can be cut according to size. For complex shapes, blanking templates need to be made first, and unidirectional tapes or fabrics are cut according to the templates, and then manually laid on the mold, and then the excess materials are cut off. Experience strong, there are disadvantages such as poor dimensional accuracy, low efficiency, large production area, and low material utilization rate, which no longer meet the characteristics of modern aircraft digital design and manufacturing
[0003] Foreign research on composite materials is relatively early, and some advanced technologies have been put into use, which has brought considerable economic benefits, while domestic research started relatively late, and there is still a certain gap

Method used

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  • Laying spreading method for composite material
  • Laying spreading method for composite material
  • Laying spreading method for composite material

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Experimental program
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Embodiment Construction

[0033] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0034] The surface to be unfolded is approximately represented by 3840 triangles connected by 2012 nodes (such as image 3 ), the composite material to be laid on the curved surface is a plain weave cloth, and the distance between any two warp fibers or weft fibers is 1mm. direction.

[0035] According to the present invention, its implementation process is as follows:

[0036] 1) Analyze the topological connection relationship of the triangular mesh, and the number of edges N can be obtained by Euler's theorem e =N p +N F -2=5850, such as Figure 4 , the triangle connection relationship of the mesh surface can be further analyzed to obtain the following topological connection relationship among nodes, edges and triangles:

[0037] a. Point P 0 The edge set Eset 0 {e 1 ,e 2 ,e 3 ,e 4 ,e 5 ,e 6}, ..., point P 2012 Edge set Eset 2011 {...};

[00...

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Abstract

The invention relates to a laying spreading method for a composite material. The method is technically characterized in that a Tchebychev Net model is combined with a spring model, so that the composite material can be quickly and accurately spread on a complex curved surface, and a simulation result is more accurate than that of the conventional geometrical spreading method; a local searching algorithm is adopted for node scanning, so that time complexity is lowered into a constant; and an expanding node laying method is adopted, so that a laying blank area generated by a dual-baseline method is eliminated.

Description

technical field [0001] The invention relates to a digital lay-up unfolding method for weaving composite materials, which is used in the field of digital manufacturing of composite materials, and obtains a two-dimensional unfolded blank according to the three-dimensional curved surface of a composite material part. Background technique [0002] Composite material complex surface unfolding method is a key link in the digital design and manufacture of composite materials. By unfolding the complex surface, the precise blank shape of the composite material layup can be obtained, the feasibility of the composite material layup design can be analyzed, and it can be directly used in CNC blanking realizes digital design and manufacturing of composite materials. When laying and blanking traditional composite materials, simple parts can be cut according to size. For complex shapes, blanking templates need to be made first, and unidirectional tapes or fabrics are cut according to the te...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 吴建军邓良才张深
Owner NORTHWESTERN POLYTECHNICAL UNIV
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