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A test method for interfacial shear strength of thermosetting resin matrix composites

A technology of interfacial shear strength and composite materials, applied in the direction of applying stable shear force to test material strength, material resistance, and analysis of materials, can solve the difficulty of strength value, increase the difficulty and uncertainty of testing, and the difficulty of size Control and other issues, achieve the effect of low sample size requirements, promote research and application, and shorten the evaluation cycle

Active Publication Date: 2022-04-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because each test method ignores the different angles between the resin and the fiber, there are problems of inaccurate test data and large dispersion.
In addition, the fiber fracture method requires the single filament length when the critical length of the fiber is known, but the strength value is difficult to directly determine, which increases the difficulty and uncertainty of the test
At the same time, monofilament extraction (fiber extraction and microbead extraction) increases the difficulty of sample preparation due to the difficulty in controlling the size of the monofilament extraction sample preparation; and the fiber is easily broken during the test, resulting in a low success rate during the test. Shortcomings such as low overall efficiency

Method used

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  • A test method for interfacial shear strength of thermosetting resin matrix composites
  • A test method for interfacial shear strength of thermosetting resin matrix composites
  • A test method for interfacial shear strength of thermosetting resin matrix composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for testing the interfacial shear strength of thermosetting resin-based composite materials based on the magnetic fiber stress impedance effect, comprising the following steps:

[0055] (1) Adopt 3% silane coupling agent-ethanol solution to process amorphous alloy fiber (this embodiment adopts glass-coated magnetic fiber, its SEM figure is as attached figure 1 ), the fiber composition is Co-Fe-Si-B-Ni-Mo, the diameter is 24.65 μm, and the surface has a 2 μm thick glass coating layer. After ultrasonic treatment for 20 minutes, it is placed in an oven at 100 ° C for 1.5 hours; after drying, the The amorphous alloy fiber is fixed on a hollow aluminum alloy rectangular frame; under an optical microscope, use a slender needle to drop the prepared cyanate resin acetone solution on the amorphous alloy fiber, and the resin forms a spindle under the action of surface tension microspheres, as attached figure 2 ;

[0056] (2) After the oven is cured, the amorphous alloy ...

Embodiment 2

[0061] The difference between this embodiment and embodiment 1 is that the thermosetting resin is replaced by phenolic resin, and other magnetic fiber materials, processing methods and testing steps are the same as in embodiment 1. According to the absolute value of the slope to the descending section fitted from the impedance change-embedding length relationship map|k 2 | is 1.14211, while the resin modulus of elasticity is 4000MPa, the calculated interface shear strength of Example 2 is 68.15MPa, and the interface shear strength recorded by the traditional micro-debonding method is 70.3MPa.

Embodiment 3

[0063] The difference between this embodiment and Embodiment 1 is that the thermosetting resin is replaced by epoxy resin, and other magnetic fiber materials, processing methods and testing steps are the same as in Embodiment 1. According to the absolute value of the slope to the descending section fitted from the impedance change-embedding length relationship map|k 3 | is 1.496551, the resin modulus of elasticity is 4200MPa, and the interfacial shear strength obtained by calculating Example 3 is 78.88MPa, and the interfacial shear strength measured by the traditional micro-debonding method is 79.8MPa.

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Abstract

The invention discloses a method for testing the interface shear strength of a thermosetting resin-based composite material based on the magnetic fiber stress resistance effect. The present invention comprises: S1: the preparation of the sample to be tested; S2: the impedance performance test of the sample to be tested and the statistics of the resin embedding length, obtain the relationship map of impedance-embedding length; S3: according to the impedance change value and the total embedding length The slope k of the fitting curve is substituted into the impedance-interfacial shear strength conversion formula to obtain the interfacial shear strength of the composite material. The present invention uses a stress transfer model to indirectly test the interface shear strength by measuring the impedance of the magnetic fiber. The method has low requirements for sample preparation and testing equipment, is simple to operate, and can improve the efficiency and accuracy of the composite material interface shear strength test. It is used to quickly judge and screen thermosetting resin systems with good interfacial adhesion properties.

Description

technical field [0001] The invention relates to a technology for detecting the interface shear strength of a fiber-reinforced resin-based composite material, in particular to a method for testing the interface shear strength of a thermosetting resin-based composite material based on the magnetic fiber stress impedance effect, and belongs to the field of composite materials. Background technique [0002] As an emerging composite material, lightweight fiber-reinforced thermosetting resin-based composites (high specific strength and specific modulus) are gradually applied to technical fields such as automobiles, wind power generation, rail transit, and aerospace, and belong to the national high-tech The industry focuses on encouraging the development of industries with broad development space. At present, the state vigorously supports the industrial application of fiber-reinforced thermosetting resin-based composite materials, which has led to the rapid expansion of related com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N27/04
CPCG01N3/24G01N27/041G01N2203/0025G01N2203/0075
Inventor 秦发祥许鹏冯唐峰彭华新
Owner ZHEJIANG UNIV
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