Foam reinforced sandwich structure with fiber bundle and preparation method using sewing-thermal expansion curing molding

A technology for reinforcing foam and sandwich structures, applied in chemical instruments and methods, lamination, lamination devices, etc., can solve problems such as low load bearing, and achieve the effect of improving reinforcement efficiency, shear resistance and impact resistance.

Inactive Publication Date: 2009-08-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcoming of the low load capacity of the existing foam sandwich structure, the present invention proposes a reinforced foam sandwich structure with fiber bundles using a sewing reinforcement-thermal expansion curing method

Method used

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  • Foam reinforced sandwich structure with fiber bundle and preparation method using sewing-thermal expansion curing molding
  • Foam reinforced sandwich structure with fiber bundle and preparation method using sewing-thermal expansion curing molding
  • Foam reinforced sandwich structure with fiber bundle and preparation method using sewing-thermal expansion curing molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: 20mm thick reinforced foam sandwich structure

[0055] The first step: making compressed core material

[0056] Put polyurethane foam with a thickness of 36mm into the first mold, then place the first mold with polyurethane foam on the platform of the hot press, press 0.1MPa at the heat deformation temperature of the foam at 90°C for compression treatment, and then Cool to 30°C and demould to obtain 18mm thick compressed core material;

[0057] The second step: making the preform

[0058] (A) Tiling 1mm thick glass fiber prepreg to form the lower panel 3;

[0059] (B) Spread the compressed core material 1 on the lower panel 3, and then spread a 1 mm thick glass fiber prepreg on the compressed core material 1, and lay the lower panel 3, the compressed core material 1 and the upper panel 2. forming a preform;

[0060] Step 3: Continuous sewing of fiber bundles

[0061] A fiber bundle with a diameter of 0.5 mm is sewn on the thickness direction of the pre...

Embodiment 2

[0069] Example 2: 78mm thick reinforced foam sandwich structure

[0070] In order to obtain the reinforced foam sandwich structure with fiber bundles, the present invention adopts the combined mode of sewing reinforcement-thermal expansion solidification to prepare, which includes the following steps:

[0071] The first step: making compressed core material

[0072] Put the selected phenolic foam with a thickness of 90mm into the first mold, and then place the first mold with the phenolic foam on the platform of the hot press, press 0.3MPa at the foam heat distortion temperature of 150°C for compression treatment, and then After cooling to 25°C, demould to obtain a compressed core material;

[0073] The second step: making the preform

[0074] (A) Laying 5mm thick aramid fiber prepreg (the aramid fiber is impregnated with two-component epoxy resin) to form the lower panel 3;

[0075] (B) Spread the compression core material 1 on the lower panel 3, and spread a 3mm thick c...

Embodiment 3

[0084] Example 3: 10mm thick reinforced foam sandwich structure

[0085] In order to obtain the foam sandwich structure with fiber bundles, the present invention adopts the combined mode of sewing reinforcement-thermal expansion solidification to prepare, which includes the following steps:

[0086] The first step: making compressed core material

[0087] Put polymethacrylimide foam with a thickness of 12mm into the first mold, and then place the first mold with polyimide foam on the platform of the hot press, and heat it at a heat deformation temperature of 240°C Apply a pressure of 0.5MPa for compression treatment, then cool to 30°C and demould to obtain a compressed core material;

[0088] The second step: making the preform

[0089] (A) Tiling 1mm thick carbon fiber prepreg (the carbon fiber is impregnated with two-component epoxy resin) to form the lower panel 3;

[0090] (B) Spread the compression core material 1 on the lower panel 3, and spread a 1mm thick carbon f...

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Abstract

The invention discloses a reinforced foam interlayer structure with fiber bundles and a preparation method by adopting sewing-thermal expansion curing molding. according to certain pin length d1, pin pitch d3 and row pitch d2, the fiber bundles are connected up and down and sewed on a preforming body in the depth direction of the preforming body so as to realize that an upper panel, a compressed core material and a lower panel are sewed together; subsequently, at temperature of between 60 and 220 DEG C, foam core expands to produce expansion pressure of between 0.05 and 0.7 MPa; after the foam core is cured for 30 and 300 minutes at expansion pressure, the foam core is cooled and demoulded and the reinforced foam interlayer structure with fiber bundles is obtained.

Description

technical field [0001] The invention relates to a molding method for making a foam sandwich structure. More specifically, it refers to a method of sewing reinforcement-thermal expansion curing in the thickness direction of the foam sandwich structure, so that the prepared foam sandwich structure has stronger bearing capacity. Background technique [0002] The foam sandwich structure generally consists of an upper panel 2, a lower panel 3 and a foam core 1a sandwiched therein (see figure 2 shown). The foam sandwich structure has the characteristics of light weight, high rigidity, sound insulation, heat insulation, vibration resistance, etc., and is widely used in aerospace, transportation, construction and other fields. However, due to the low mechanical properties of foam plastics, foam collapse or surface-core peeling are prone to occur when bearing loads, which severely limits the application of foam sandwich structures on main load-bearing components. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/18B32B7/08B32B37/00B29C44/02B29C44/60B29B11/12B29B11/16B29B11/00
Inventor 张佐光郝继军李敏孙志杰顾轶卓
Owner BEIHANG UNIV
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