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Method for evaluating cracking resistance of epoxy material

A technology of epoxy materials and evaluation methods, applied in the field of high voltage insulation, to achieve the effects of reducing errors, improving test accuracy, and uniform temperature

Active Publication Date: 2020-06-30
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the relatively one-sided defect in the prior art that the test of the crack resistance of epoxy materials is only based on the impact strength, so as to provide a new and more comprehensive crack resistance Evaluation method

Method used

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  • Method for evaluating cracking resistance of epoxy material
  • Method for evaluating cracking resistance of epoxy material
  • Method for evaluating cracking resistance of epoxy material

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Embodiment 1

[0046] This embodiment provides a kind of anti-cracking sample for epoxy resin and its composite material, such asfigure 1 As shown, the anti-cracking sample provided in this embodiment is in the form of simulating epoxy-coated metal parts, which is a cylindrical structure as a whole, including: a sample body 1 and a sample stress module 2, and the sample stress module 2 It is a metal plate with a quadrilateral cross section, the sample stress module 2 is embedded in the center of the sample body 1, the thickness of the sample body 1 and the sample stress module 2 are equal, and the sample After the stress module 2 is embedded in the center of the sample body 1, the front and rear sides of the sample stress module 2 are flush with the sample body 1; the surrounding of the sample stress module 2 is covered by the sample body 1, so The outer contour of the sample body 1 is cylindrical.

[0047] Such as figure 1 As shown, the sample stress module 2 is embedded in the four corner...

Embodiment 2

[0057] This embodiment provides a method for evaluating the anti-cracking performance of epoxy materials, wherein the epoxy materials include epoxy resin and its composite materials. This embodiment takes an epoxy castable with a model of HW428 as an example , to describe the method. The method comprises the following steps:

[0058] Step 1: preparing an anti-cracking sample, and grinding the outer surface of the anti-cracking sample; wherein, the anti-cracking sample is the anti-cracking sample described in Example 1. The outer surface of the anti-cracking sample after demoulding is polished to remove the burrs and burrs at the corners of the anti-cracking sample. The principle of grinding is to remove the burrs and burrs of the anti-cracking sample to restore its The original shape is enough; the grinding steps are as follows: first, use 600-mesh sandpaper for preliminary grinding, and then use 1200-mesh sandpaper for fine grinding. In addition, as an alternative embodimen...

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Abstract

The invention provides a method for evaluating the cracking resistance of an epoxy material, and belongs to the technical field of high-voltage insulation. The method comprises the following steps: 1,preparing an anti-cracking sample; 2, rapidly cooling the at least one anti-cracking sample in a temperature box to obtain a predicted cracking temperature; 3, taking a temperature at least 20 DEG Chigher than the expected cracking temperature as an initial temperature, and allowing the anti-cracking sample to stand at the initial temperature for 20 min or more; and 4, cooling the anti-crackingsample obtained in step 3 at a speed of 0.05-0.1 K / min, observing the anti-cracking sample, recording the cracking temperature of the anti-cracking sample as a final cracking temperature, and evaluating the anti-cracking performance of the anti-cracking sample according to the final cracking temperature. The temperature change test of the anti-cracking sample is closer to the actual use conditionof the epoxy insulating material in high-voltage equipment, and the evaluation of the performances of the anti-cracking sample is more comprehensive and reliable.

Description

technical field [0001] The invention relates to the technical field of high-voltage insulation, in particular to an evaluation method for crack resistance of epoxy materials. Background technique [0002] Epoxy resin and its composite materials are widely used in aerospace, power electronics, rail transit and other fields due to their good mechanical strength, insulation performance, heat resistance and excellent processing performance. The brittleness of the epoxy material itself has always been one of the main reasons for its failure in operation. It is directly reflected in the stress cracking of the epoxy material in the cold and hot environment and mechanical fatigue. This kind of cracking and even microcracks have higher requirements for comprehensive performance. The high-voltage insulation field is fatal and will cause the insulation breakdown of the insulation to fail. Insulators are weak links in high-voltage equipment, and their performance will directly determin...

Claims

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Application Information

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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 尹立张翀杨威何愈颜丙越陈赟何俊凌王琨邢照亮史晓宁陈新张卓周明瑜王海田孙璐
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD