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A kind of three-point bending specimen ductility fracture toughness jic test device and test method

A three-point bending and ductile fracture technology, which is applied to the measuring device, using a stable bending force to test the strength and strength characteristics of materials, etc., can solve the problem that the displacement of the force point of the three-point bending sample cannot be tested, and achieve high accuracy. , The effect of easy disassembly and low error

Active Publication Date: 2018-12-25
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Application Information

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Problems solved by technology

[0003] To address ductile fracture toughness J IC In the test, the displacement of the application point of the three-point bending sample cannot be tested. The present invention provides a kind of ductility and fracture toughness of the three-point bending sample. J IC Test device and its test method

Method used

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  • A kind of three-point bending specimen ductility fracture toughness jic test device and test method
  • A kind of three-point bending specimen ductility fracture toughness jic test device and test method
  • A kind of three-point bending specimen ductility fracture toughness jic test device and test method

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Embodiment 1

[0047] A ductile fracture toughness of a three-point bending specimen J IC After the successful invention of the test device, the ductility fracture toughness of various grades and different thicknesses of pipeline steel materials were tested in air and seawater environments. J IC test. The test of a pipeline steel material is taken as an example below.

[0048] 1. Test material: X70 pipeline steel

[0049] 2. Heat treatment state: Quenched and tempered

[0050] 3. Test temperature: 23~25℃ Relative humidity: 40~50%

[0051] 4. Sample type: SE(B) sample, see Figure 7 , 8 .

[0052] 5. Test item: ductile fracture toughness J IC test

[0053] 6. Test method: install the double knife edge device on the X70 pipeline steel SE (B) sample, and use two COD gauges to test the opening displacement of the two knife edges V 1 and V 2 , the displacement of the applied point of the sample can be obtained from the formula (2) q , the Δ of X70 pipeline steel was obtained by mu...

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Abstract

The invention discloses a three-point bending sample ductile fracture toughness (JIC) testing device and a test method thereof. According to the method, under the assistance of a knife edge auxiliary device, opening displacement of COD gauges at different heights can be obtained; through calculation, the displacement of force point of a three-point bending sample can be obtained, and further the ductile fracture toughness (JIC) of the three-point bending sample can be obtained. The provided testing device and test method can effectively carry out safety evaluation on high strength and high toughness.

Description

technical field [0001] The invention belongs to the technical field of detection of fracture mechanical properties of metal materials, in particular to a ductile fracture toughness of a three-point bending sample J IC Test device and its test method. Background technique [0002] With the improvement of metallurgical quality, high-strength and high-toughness alloys are used more and more in engineering as structural materials, and safety evaluations are often required. plane strain fracture toughness K ІC It is an important safety evaluation index and structural part design index, so the plane strain fracture toughness of high-strength and high-toughness alloys can be obtained through testing K ІC becomes particularly important. But for high-strength and high-toughness alloys, the direct test of plane strain fracture toughness K ІC It is usually not feasible because the plane strain K ІC Judgment conditions B ≥2.5( K ІC / R p0.2 ) 2 and P max / P Q ≤1.1; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/20G01N3/02
CPCG01N3/02G01N3/20
Inventor 郑国华查小琴马江南
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP