Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for testing the normal strength between layers of composite materials

A composite material layer and composite material technology, applied in the field of composite material interlayer normal strength test method and the design and manufacture of test pieces, can solve the problems of easy damage, low interlayer performance, inaccurate measured performance, etc.

Inactive Publication Date: 2021-03-30
BEIHANG UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of this type of composite material is equivalent to or stronger than that of metal, its interlayer performance is very low, and the interlayer is only carried by the interlayer interface, which is an area that is easily damaged. Therefore, its interlayer strength must be measured. For quality and performance evaluation of composite materials
[0003] At present, there is no test method for the interlayer normal strength of carbon fiber composite materials. Although GB / T 4944 can measure the interlayer tensile strength of glass fiber laminates, it requires that the bond strength between the specimen and the metal is higher than that of the test specimen. However, the interlaminar performance of advanced composite materials is often higher than the bonding strength of the adhesive, which will cause the failure mode of the specimen to be contrary to the expectation, making the measured properties inaccurate

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for testing the normal strength between layers of composite materials
  • A method for testing the normal strength between layers of composite materials
  • A method for testing the normal strength between layers of composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] The invention provides a method for testing the interlaminar normal strength of a composite material, said test method comprising the following steps:

[0026] In the first step, the thin film is prepared.

[0027] The film is made of 100mm×100mm square polytetrafluoroethylene material. The thickness of the film should be thin enough under the premise that the process allows, which can not only ensure the integrity of the film during the preparation process, but also ensure that the interface strength on both sides of the hollowed out area is not weakened, usually the theoretical thickness of the single layer of the composite material to be measured about 20%. The film contains an annular hollow area, which corresponds to the composite test area. Such as figure 1 and figure 2 As shown, the inner and outer diameters R of the hollowed out area 1 , R 2 An...

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
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for testing the normal strength between the layers of a composite material, and belongs to the technical field of composite materials and material performance testing.According to the method, the specimen is a square flat plate block-like body; during the paving adhesion, a polytetrafluoroethylene film doing not cover the test area is inserted between the upper paving layer and the lower paving layer of the predetermined testing interface, and curing molding is performed; and the strength between the layers of the composite material is tested by using a testing device. According to the present invention, the method is used for testing the normal strength between the layers of the composite material, and breaks through the limitation on the interlayer performance of the to-be-tested specimen in the conventional method; and the corresponding size of the hollowed-out zone of the PTFE film can be designed according to the interlayer performance of the to-be-tested composite material, such that the normal damage load between the layers in the test can be controlled, and the interlayer damage of the composite material precedes the adhesive damage betweenthe metal block and the specimen so as to ensure the damage mode.

Description

technical field [0001] The invention belongs to the technical field of composite materials and material performance testing, and relates to a method for testing the interlayer normal strength of composite materials and a method for designing and manufacturing test pieces thereof. Background technique [0002] Composite materials have the characteristics of light weight and high strength, and have been widely used in sports, aviation, aerospace and other fields. Advanced composite materials specifically refer to composite materials that can be used in the main load-bearing structure or secondary load-bearing structure, and whose stiffness and strength properties are equivalent to or exceeding aluminum alloys. At present, it mainly refers to boron fibers, carbon fibers, and aramid fibers with higher strength and modulus. Reinforced composite materials. Although the performance of this type of composite material is equivalent to or stronger than that of metal, its interlayer p...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 黎增山王鑫王晓东关志东
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com