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Method for measuring fracture toughness J<IC> of heat affected zone of welded joint

A heat-affected zone and fracture toughness technology, which is used in the preparation of test samples and the application of stable bending force to test the strength of materials to achieve the effect of convenient operation, reducing errors and avoiding material waste.

Active Publication Date: 2014-09-24
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] In order to solve the above-mentioned two problems existing in the measurement of the fracture toughness of the heat-affected zone of the welded joint in the prior art, the present invention proposes a method for measuring the fracture toughness of the heat-affected zone of the welded joint, by controlling the lowering of the beam during the three-point bending test The compression velocity and the method of opening a V-shaped groove on the three-point bending specimen can effectively measure the J integral value of the heat-affected zone, thereby calculating its fracture toughness J IC

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  • Method for measuring fracture toughness J&lt;IC&gt; of heat affected zone of welded joint
  • Method for measuring fracture toughness J&lt;IC&gt; of heat affected zone of welded joint
  • Method for measuring fracture toughness J&lt;IC&gt; of heat affected zone of welded joint

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Embodiment 1

[0027] The measurement of the fracture toughness J of the heat-affected zone of the welded joint in this embodiment IC The method mainly includes the following steps:

[0028] (1) Taking a sample with a thickness of 15mm as an example, process 8 to 10 three-point bending samples. The three-dimensional schematic diagram of the sample is shown in figure 1 , see the specific size figure 2 , where the depth of the V-groove is 1.5mm, the angle is 60°, and the bottom fillet radius is 0.2mm;

[0029] (2) Perform fatigue crack prefabrication on the three-point bending specimen on the fatigue testing machine, where the maximum load is 10kN, the minimum load is 1kN, the stress ratio R is 0.1, and the fatigue crack length is about 2.0mm;

[0030] (3) Perform a three-point bending test on a universal testing machine, load the first sample to the maximum load, distribute the remaining samples evenly between the maximum load point and the end point of the elastic stage, and perform a thr...

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Abstract

The invention discloses a method for measuring the fracture toughness J<IC> of each micro area of a heat affected zone of a welded joint, which is applicable to measurement on fracture toughness of various welded joints. According to the method, by forming a V-shaped groove in a coarse grain zone or a fine grain zone in the welded heat affected zone on a three-point bending test sample, the direction of crack development is effectively controlled to ensure the crack development in the coarse grain zone or the fine grain zone in the heat affected zone, and thus the fracture toughness of the different micro areas in the heat affected zone of the welded joint can be measured. The method is simple, is low in cost, ensures real and reliable measurement results, and has great significance for evaluating the mechanical property of each micro area of the welding joint, confirming a weak section of the welded joint and studying the fracture toughness of the heat affected zone of the welded joint.

Description

technical field [0001] The invention relates to the field of testing the fracture mechanical properties of welded joints, in particular to a method for measuring the fracture toughness J of each micro-zone in the heat-affected zone of the welded joint. IC The method is applicable to the determination of fracture toughness of various welded joints. Background technique [0002] In recent years, people have paid more and more attention to the study of fracture toughness of welded engineering structures. Some major engineering structures, such as nuclear reactors, large ships, offshore platforms, oil and gas pipelines, etc., will face heavy losses and disasters once cracks appear that may lead to the disintegration of the structure. and engineering applications are of great significance. The parameters for evaluating the fracture toughness of materials are fracture toughness K IC 、J IC And, CTOD (crack tip opening displacement), etc., for most metal materials, can be measur...

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Application Information

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IPC IPC(8): G01N3/20G01N1/28
Inventor 芦凤桂郭谦崔海超唐新华王朋丁玉明刘霞
Owner SHANGHAI JIAO TONG UNIV
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