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Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof

A technology of local heating and oxidizing environment, applied in the direction of using stable bending force to test material strength, using stable tension/pressure to test material strength, etc., to achieve the effect of saving test costs, fast mechanical properties, and simple test operation.

Active Publication Date: 2011-01-05
CHINA TEST & CERTIFICATION INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these methods have been used above 1500°C due to limitations such as furnaces or fixtures

Method used

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  • Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof
  • Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof
  • Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0077] Example 1: Measuring the tensile strength of ultra-high temperature materials for a certain military product.

[0078] Use a wire cutting machine to cut a military product supporting ultra-high temperature material into several strips of 3mm×4mm×90mm or 3mm×4mm×40mm, and then polish the surface;

[0079] The specific experimental operation steps are:

[0080] 1) Take an experimental sample, measure its size as 3.10mm×3.84mm×90.3mm, fix one end of the sample on the sample support and clamp it (such as figure 1 shown), and the other end is fixed on the loading rod of the portable loading instrument. In order to prevent damage to the surface of the sample, a specific flexible material, such as scotch tape, is glued to both ends of the sample.

[0081] 2) Use acetylene or gasoline oxygen-increased flame injection technology to test the middle position P of the sample 1 point for rapid heating, using an infrared thermometer to measure the surface P 2 The temperature of t...

example 2

[0084] Example 2: Measure the compressive strength of ultra-high temperature materials for a certain military product.

[0085] The specific experimental operation steps are:

[0086] 1) Take an experimental sample, measure its size as 3.10mm×3.90mm×40.04mm, place the sample between the loading rod of the portable loading instrument and the frame base, and apply a pre-tightening force of about 5N (such as figure 2 shown);

[0087] 2) Use acetylene or gasoline oxygen-increased flame injection technology to test the middle position P of the sample 1 point for rapid heating, using an infrared thermometer to measure the surface P 2 The point temperature reaches 1833°C;

[0088] 3) Load the sample at a speed of 0.5mm / min until the sample breaks, and record the load-displacement curve. The corresponding critical load when the sample breaks is 300.24N. If the sample fracture location is in the flame heating zone, the experimental results are valid. Otherwise, the experimental r...

example 3

[0090] Example 3: Measure the cantilever beam bending strength of ultra-high temperature materials for a certain military product.

[0091] The specific experimental operation steps are:

[0092] 1) Take a test sample, measure its size as 3.02mm×3.84mm×90.5mm, place the sample on a fixed sample support and clamp it (such as image 3 shown), using acetylene or gasoline oxygen-increased flame injection technology 1 point for rapid heating, using an infrared thermometer to measure the surface P 2 The point temperature reaches 1695°C;

[0093] 2) Accurately measure the distances from the loading point P and the central point P1 of the fire-spraying area to the edge P3 of the support to be 65.9mm and 33.6mm, respectively.

[0094] 3) Load the sample at the loading point P at a speed of 0.5mm / min until the sample breaks, and record the load-displacement curve. The critical load corresponding to the break of the sample is 19.76N. If the sample fracture location is in the flame he...

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Abstract

The invention provides a test method capable of simply and conveniently testing mechanical properties of tensile strength, compressive strength, bending strength and fracture toughness of ceramic material and composite material thereof under superhigh temperature oxidation environment with the temperature of more than 1500 DEG C and a test device thereof. The test device is composed of a test frame, a fixed sample system, a loading system, a superhigh temperature flaming heating system, a record display system and a non-contact type infrared temperature measuring system. The method includes that acetylene or gasoline aeration flaming technology is adopted to locally and rapidly heat a sample, so that local temperature thereof reaches more than 1500 DEG C, a portable tester is utilized to apply bending, stretching or compressive load on the sample, and load value is recorded, thus obtaining mechanical properties of material. The invention has the advantages that operation is simple, the technology of local high temperature and synchronous loading on superhigh temperature sample is realized, superhigh temperature mechanical properties which can not be tested before such as strength and toughness of material can be conveniently measured under superhigh temperature oxidation environment by utilizing the test device of the invention.

Description

technical field [0001] The invention belongs to the field of material mechanical performance testing, and relates to a technique for evaluating the mechanical properties of materials in an extreme environment of ultra-high temperature oxidation, in particular to a method and device for testing material properties by a local heating loading method. Background technique [0002] With the rapid development of new materials and aerospace technology, there is an increasing demand for high-temperature structural materials that are resistant to high temperatures, corrosion, and wear, such as nozzle materials in rockets and aero-engines, which need to withstand the The mechanical scour of the high-temperature and high-speed gas at 2000-3100 °C requires that the material of the nozzle has sufficient high-temperature resistance. Rockets, missiles, and satellites mostly invest hundreds of millions of yuan. If the launch fails due to improper selection of materials, the loss will be hug...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/20
Inventor 包亦望万德田邱岩张伟刘小根
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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