A kind of z-pin reinforced composite grid structure and its manufacturing method

Abstract

The invention relates to a Z-pin reinforced composite grid structure and a manufacturing method thereof, belonging to the technical field of fibrous composite reinforcement. The manufacturing method comprises the following steps: planning movement locus of a fiber placement head by a design procedure through a specially-designed grid fiber placement device, and overlaying a grid structure on a grid forming mould by adopting a shearing-continuing placement process; preparing high-performance Z-pin by an advanced pultrusion device, designing a Z-pin parameter, and implanting the Z-pin in a foam prefab; implanting the Z-pin at the structure node part of a grid by ultrasonic implant equipment; and reinforcing the Z-pin reinforced composite grid stiffened structure. According to the invention, the problems of uniform thickness caused by repeated prepreg layering and layered bridging resulted from crossed fiber layers at the node parts can be solved, connection strength and anti-fatigue performance of the node parts also can be obviously enhanced, and Z-pin is light, high in strength and small in fiber damage.

Description

Technical field

[0001] The invention relates to the technical field of composite material reinforcement, in particular to a Z-pin reinforced composite material grid structure and a manufacturing method thereof. Background technique

[0002] The composite grid structure has high specific strength and specific rigidity, and is one of the important aerospace lightweight structures. Its advantages are: (1) It has good topology optimization, and can achieve higher section moment of inertia compared with other composite material structures, and has higher bending and buckling resistance; (2) Unidirectional composite material reinforcement The rib has no material matching problems, no delamination, etc., and has a high damage tolerance and fatigue resistance. Under load, especially under impact load, even if the rib is damaged, cracks are not easy to propagate It overcomes the defect that the laminate structure is easy to delamination; (3) It is an open structure, which overcomes the d...

Examples

no. 1 example

[0035] The first embodiment: such as figure 2 As shown,

[0036] The Z-pin reinforced composite grid structure of the present invention includes transverse ribs 1 and longitudinal ribs 2, and nodes 3 are formed at the intersection of transverse ribs 1 and longitudinal ribs 2, wherein: transverse ribs 1 and longitudinal ribs 2 adopt “cutting-continuous laying” in turn The process is to lay up, and at the intersection, node 3, implant Z-pin 4 to improve the connection strength of the composite grid structure;

[0037] The "cut-continuous paving" process is: in each layer of composite grid structure, only one of the transverse ribs 1 and longitudinal ribs 2 is laid on the node, and the other is cut on both sides of the node, so that the thickness of each node is the same as that of the transverse rib 1. , The thickness of the rest of the longitudinal rib 2 is the same.

[0038] In the embodiment, the Z-pin 4 implantation direction is perpendicular to the surface of the node 3 formed b...

no. 2 example

[0051] The second embodiment: such as image 3 As shown,

[0052] In the embodiment, the Z-pin 4 is also implanted in the position near the node 3 on the transverse rib 1 and the longitudinal rib 2.

[0053] The undescribed parts are the same as the first embodiment.

[0054] Compared with the first embodiment, this embodiment has more Z-pin 4 implanted, a wider range, and higher connection strength.

no. 3 example

[0055] The third embodiment: such as Figure 4 As shown,

[0056] In the embodiment, the angle formed by the node 3 and the transverse rib 1 and the longitudinal rib 2 is covered with the same material as the transverse rib 1 and the longitudinal rib 2 to form a reinforcing plate 5.

[0057] The undescribed parts are the same as in the second embodiment.

[0058] Compared with the second embodiment, compared with the first embodiment, this embodiment adds a reinforcing plate 5 to further enhance the connection strength at the nodes.

Technical field

[0001] The invention relates to the technical field of composite material reinforcement, in particular to a Z-pin reinforced composite material grid structure and a manufacturing method thereof. Background technique

[0002] The composite grid structure has high specific strength and specific rigidity, and is one of the important aerospace lightweight structures. Its advantages are: (1) It has good topology optimization, and can achieve higher section moment of inertia compared with other composite material structures, and has higher bending and buckling resistance; (2) Unidirectional composite material reinforcement The rib has no material matching problems, no delamination, etc., and has a high damage tolerance and fatigue resistance. Under load, especially under impact load, even if the rib is damaged, cracks are not easy to propagate It overcomes the defect that the laminate structure is easy to delamination; (3) It is an open structure, which overcomes the d...

Examples

no. 1 example

[0035] The first embodiment: such as figure 2 As shown,

[0036] The Z-pin reinforced composite grid structure of the present invention includes transverse ribs 1 and longitudinal ribs 2, and nodes 3 are formed at the intersection of transverse ribs 1 and longitudinal ribs 2, wherein: transverse ribs 1 and longitudinal ribs 2 adopt “cutting-continuous laying” in turn The process is to lay up, and at the intersection, node 3, implant Z-pin 4 to improve the connection strength of the composite grid structure;

[0037] The "cut-continuous paving" process is: in each layer of composite grid structure, only one of the transverse ribs 1 and longitudinal ribs 2 is laid on the node, and the other is cut on both sides of the node, so that the thickness of each node is the same as that of the transverse rib 1. , The thickness of the rest of the longitudinal rib 2 is the same.

[0038] In the embodiment, the Z-pin 4 implantation direction is perpendicular to the surface of the node 3 formed b...

no. 2 example

[0051] The second embodiment: such as image 3 As shown,

[0052] In the embodiment, the Z-pin 4 is also implanted in the position near the node 3 on the transverse rib 1 and the longitudinal rib 2.

[0053] The undescribed parts are the same as the first embodiment.

[0054] Compared with the first embodiment, this embodiment has more Z-pin 4 implanted, a wider range, and higher connection strength.

no. 3 example

[0055] The third embodiment: such as Figure 4 As shown,

[0056] In the embodiment, the angle formed by the node 3 and the transverse rib 1 and the longitudinal rib 2 is covered with the same material as the transverse rib 1 and the longitudinal rib 2 to form a reinforcing plate 5.

[0057] The undescribed parts are the same as in the second embodiment.

[0058] Compared with the second embodiment, compared with the first embodiment, this embodiment adds a reinforcing plate 5 to further enhance the connection strength at the nodes.

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