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Composite material plate with folding sandwich structure and forming method thereof

A composite material board and composite material technology, applied in the field of composite material board with folded sandwich structure and its forming, can solve the problems of reduced structural load-bearing efficiency, large environmental pollution, high process cost and resource cost, and achieve safety The effect of lowering, adjustable three-dimensional stiffness, and simple preparation process

Inactive Publication Date: 2012-10-31
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of the performance of the core material structure alone, the honeycomb structure is one of the most reasonable structural forms, but for the sandwich structure, the honeycomb sandwich structure also has the same inevitable weaknesses as other sandwich structures: (1) Panel and core The bonding performance between materials weakens the performance of the honeycomb sandwich structure, resulting in lower performance of the sandwich structure in terms of shear resistance, peeling resistance, flat compression resistance, and fatigue resistance; (2) The preparation process of the honeycomb structure is complicated, The environmental pollution is high, and the process cost and resource cost are high; (3) the deformation characteristics of the honeycomb structure depend on its geometric parameters, and when the height of the honeycomb increases, its deformation ability will decrease; (4) the honeycomb structure is generally a closed structure, That is, the structure is impermeable. Once this type of structure is damaged during use, it is easy to accumulate water, resulting in a sharp deterioration of material properties and a reduction in the structural load-bearing efficiency.

Method used

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  • Composite material plate with folding sandwich structure and forming method thereof
  • Composite material plate with folding sandwich structure and forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composite material plate was prepared by co-curing with CF3031 / 5228A carbon fiber fabric folded sandwich core, and the specific steps are as follows:

[0031] (1) Prepare the upper and lower panels of CF3031 / 5228A: pre-cure the laminate of CF3031 / 5228A at 130°C / 1h, the thickness of the upper and lower panels is 2.1mm, and the curing degree is less than 0.2;

[0032] (2) Prepare the CF3031 / 5228A folded sandwich. The preparation of the folded sandwich is to make a prepreg fabric composed of fiber fabric and thermosetting resin. According to the warp and weft cell sizes of the prepreg fabric, manually press the oblique Lower crease 6, oblique upward crease 7, warp upward crease 8 and warp downward crease 9. Apply pressure in the warp and weft directions of the fabric, so that the fabric is folded upward along the upper crease and folded downward along the lower crease to form a folded body; pre-cure the folded CF3031 / 5228A carbon fiber fabric core at 130°C / 1h, The cur...

Embodiment 2

[0036] The U-shaped front edge of the composite material was prepared by co-curing with the CF3031 / 5228A carbon fiber fabric folded sandwich core. The specific steps are as follows:

[0037](1) Prepare CF3031 / 5228A upper skin and lower skin: Lay CF3031 / 5228A upper skin and lower skin in the mold respectively, pre-cure the laminated CF3031 / 5228A at 130°C / 1h, The thickness of the upper and lower skins is 2.0mm, and the curing degree is less than 0.2;

[0038] (2) Prepare the CF3031 / 5228A folded sandwich. The preparation of the folded sandwich is to make a prepreg fabric composed of fiber fabric and thermosetting resin. According to the warp and weft cell sizes of the prepreg fabric, manually press the oblique Lower crease 6, oblique upward crease 7, warp upward crease 8 and warp downward crease 9. Apply pressure in the warp and weft directions of the fabric, so that the fabric is folded upward along the upper crease and folded downward along the lower crease to form a folded bo...

Embodiment 3

[0042] Composite slabs were prepared by co-bonding CF3031 / 5228A carbon fiber fabric folded sandwich cores.

[0043] The difference between this embodiment and embodiment 2 is that the SY-14 adhesive film is replaced by 50g / m at the position where the folded core contacts the upper and lower panels 2 The amount of 5228A glue is brushed, and the glue film is removed during assembly. The rest is the same as in Example 2, and a composite material plate prepared by co-bonding CF3031 / 5228A carbon fiber fabric folded sandwich core can be obtained.

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Abstract

The invention relates to a composite material plate with a folding sandwich structure and a forming method thereof and belongs to the fields of composite materials and forming technology thereof. A composite material plate or a curved plate with lightweight, adjustable three-dimensional rigidity and a permeable whole body is formed by co-curing a pre-curing folding sandwich structure and pre-curing upper and lower panels, or co-bonding the cured folding sandwich structure and the pre-cured upper and lower panels, or performing secondary bonding on the cured folding sandwich structure and the cured upper and lower panels. The composite material plate has a simple preparation process and high shape adaptability, and can be widely applied to structures with lightweight and capable of resisting shock damage.

Description

technical field [0001] The invention belongs to the technical field of composite materials and their molding, and relates to a composite material board with a folded core and a molding method thereof. Background technique [0002] Composite sandwich "sandwich" structure is widely used because of its reasonable structure and light weight. [0003] The sandwich structure is composed of two high-strength upper and lower skins and a lightweight core material filled in them. The sandwich structure is generally obtained by bonding the upper and lower skins and the core material into a whole through an adhesive, or directly by molding or injection molding. In terms of force characteristics, when the sandwich structure bears bending load, the upper skin is stretched, the lower skin is compressed, and the core material transmits shear force. From a mechanical point of view, the sandwich structure is similar to the I-beam, the upper and lower skins are equivalent to the upper and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/10
Inventor 张明益小苏赵文明安学锋刘燕峰
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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