Laying spreading method for composite material

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...

Examples

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...

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...

Examples

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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