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

Calibration method for measuring accuracy of high-temperature crack length through direct current potential method

A technology of crack length and direct current potential, which is applied in the direction of measuring devices, electric devices, electromagnetic means, etc., can solve the problems of crack length inaccuracy, sample surface oxidation, blackening, etc., and achieve the effect of convenient operation and strong practicability

Active Publication Date: 2015-06-03
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main and a large number of tests of aero-engine materials are carried out under high temperature conditions. At high temperatures, the surface of the sample is oxidized and blackened, and the crack length cannot be observed visually.

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
  • Calibration method for measuring accuracy of high-temperature crack length through direct current potential method
  • Calibration method for measuring accuracy of high-temperature crack length through direct current potential method
  • Calibration method for measuring accuracy of high-temperature crack length through direct current potential method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with accompanying drawing and embodiment:

[0028] See attached Figure 1~3 As shown, this kind of calibration method for measuring the precision of high-temperature crack length by DC potentiometric method is characterized in that: the steps of the method are as follows:

[0029] Step 1. Referring to the requirements of the navigation mark HB7680-2000, process a compact tensile calibration sample 11. The material grade of this sample is a nickel-based superalloy of GH4169G. The width W of the sample is 40 mm, and the thickness B of the sample is Mark a current input solder joint position 3 on the sample width surface 2 on both sides of the notch 1 of the calibration sample 11, and the current input solder joint position 3 is in the center of the sample width W and sample thickness B, namely The position of the current input solder joint (3) is 20mm and 5mm from the edge of the sample width ...

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 relates to a calibration method for measuring the accuracy of high-temperature crack length through a direct current potential method. The method uses a thread hooking method and the direct current potential method to measure the crack length of a high-temperature alloy specimen. As the crack front at the fracture part of the specimen is arc-shaped, the intermediate crack length is the longest, and the crack length of the surface of the specimen is the shortest. The crack length measured by the potential method is compared with the average crack length, the surface crack length and the internal crack length measured through the thread hooking method, and the average crack length measured through the direct current potential measurement method is most consistent with the average crack length measured through the thread hooking method, so that the crack length can be calibrated through the thread hooking method.

Description

technical field [0001] The invention relates to a calibration method for measuring the length precision of a high-temperature crack by a direct current potential method, belonging to the technical field of test and test. Background technique [0002] Metal structural materials are prone to fatigue fracture problems under cyclic loading. The fatigue crack growth resistance of materials is an important performance index that must be considered in the damage tolerance design of aircraft and engines. High-temperature alloys have high high-temperature strength, good creep resistance and fatigue resistance, and high oxidation resistance and thermal corrosion resistance. They are widely used in aerospace engines, railway locomotives and other key high-temperature components of industries. Material. Crack length is the basis of crack growth performance data, and its measurement results will directly affect the results of aircraft and engine damage tolerance design. [0003] In th...

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
IPC IPC(8): G01B7/02
Inventor 王亮黄新跃郭广平
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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