Net-size preparation method of three-dimensional woven pyramid sleeve

A three-dimensional weaving, pyramid sleeve technology, applied in braids, textiles and papermaking, etc., can solve the problems of fast crack propagation, weak interlaminar shear strength, and increased processes, and achieve excellent fracture toughness and impact damage tolerance, The effect of avoiding delamination damage and reducing production costs

Inactive Publication Date: 2011-06-22
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with composite materials, metal materials have higher density, lower specific strength and specific modulus, and poor fatigue resistance and corrosion resistance. Designed to achieve the optimization of mechanical properties; compared with three-dimensional braided composites, traditional laminated composites are prone to delamination and damage due to their layered structure, cracking is sensitive and the crack propagation speed is fast, and the interlaminar shear strength is relatively weak , low impact toughness and damage tolerance, etc., and the final molding of the pyramid sleeve needs to be completed by splicing four laminated plates, the structural integrity of the part is damaged, and the mechanical properties of the splicing area are significantly reduced. Increased process, increased production costs

Method used

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  • Net-size preparation method of three-dimensional woven pyramid sleeve
  • Net-size preparation method of three-dimensional woven pyramid sleeve
  • Net-size preparation method of three-dimensional woven pyramid sleeve

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as Figure 4As shown, it is a three-dimensional schematic diagram of a three-dimensional braided pyramid sleeve with equal wall thickness, and the pyramid sleeve with equal wall thickness is woven with T700-12k carbon fiber. In the first step, according to the cross-sectional shape of the pyramid sleeve, the arrangement form of the loaded yarn spindle and the unloaded spindle is designed, and 1200 main yarns are suspended on the chassis of the knitting machine in a zigzag arrangement, and the total width of the pyramid sleeve is the same as The total thickness range includes 40 columns and 40 rows of yarns, the wall thickness of the pyramid sleeve is composed of 10 yarns, and 118 side yarns are arranged at intervals around the main yarn array. Other positions on the chassis of the knitting machine Then all are filled with empty spindles; in the second step, based on the four-step square three-dimensional weaving process, weave the two beam parts and the remaining l...

Embodiment 2

[0031] Such as Figure 4 As shown, it is a three-dimensional schematic diagram of a three-dimensional braided pyramid sleeve with equal wall thickness, and the pyramid sleeve with equal wall thickness is woven with T700-3k carbon fiber. In the first step, according to the cross-sectional shape of the pyramid sleeve, the arrangement form of the loaded yarn spindle and the unloaded spindle is designed, and the 768 main yarns are suspended on the chassis of the knitting machine in a zigzag arrangement. The total width range of the pyramid sleeve is There are 40 columns of yarns in total, and 36 rows of yarns in the total thickness range. The wall thickness of the pyramid sleeve is composed of 6 yarns, and 134 side yarns are arranged at intervals around the main yarn array. The knitting machine The other positions on the chassis are all filled by empty spindles; in the second step, based on the four-step square three-dimensional weaving process, weave the two beam parts and the re...

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Abstract

The invention relates to a net-size preparation method of a three-dimensional woven pyramid sleeve, which comprises the steps of: arranging yarns into a square shape on a chassis of a weaving machine, and on the basis of the four-step square three-dimensional weaving process, weaving a cross beam part and a longitudinal beam part of the pyramid sleeve respectively; and the net-size preparation method is characterized in that the yarns are moved and reduced for at least once in the weaving process to obtain an equal-wall-thickness three-dimensional pyramid sleeve. The net-size preparation method of the three-dimensional woven pyramid sleeve can realize net-size forming of the pyramid sleeve, and reduce the working procedures; and the prepared products have higher specific strength, fatigue resistance and impact damage tolerance, and can totally avoid damage to the sleeve layer by layer.

Description

technical field [0001] The invention relates to a net-shape preparation method of a three-dimensional braided pyramid sleeve, in particular to a yarn-reducing net-size molding method for a quadrangular pyramid-shaped three-dimensional braided composite material sleeve with equal wall thickness. Background technique [0002] Square pyramid sleeves with equal wall thickness are widely used in aerospace, national defense and military industries, such as helicopter rotor blades, satellite truss joints, missile heat shields, etc. are all square pyramid sleeve components. At present, metal materials or composite material laminates are mostly used to prepare such pyramid sleeves through compression molding. Compared with composite materials, metal materials have higher density, lower specific strength and specific modulus, and poor fatigue resistance and corrosion resistance. Designed to achieve the optimization of mechanical properties; compared with three-dimensional braided com...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04C1/06
Inventor 刘丽芳刘兆麟俞建勇阎建华
Owner DONGHUA UNIV
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