Tracing method of ultrasound ray in anisotropic welding line on basis of Fermat principle
An anisotropic, sound-ray technology, applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measurement devices, can solve problems such as increasing the complexity of ultrasonic waves and the difficulty of detection. Achieve the effect of improving tracking efficiency
Inactive Publication Date: 2017-09-01
BEIJING UNIV OF TECH
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Problems solved by technology
Therefore, the above-mentioned structural characteristics of the austenitic stainless steel weld greatly increase the complexity of ultrasonic propagation in the weld and the difficulty of detection
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Embodiment 1
[0029] The detected object is the weld of 316 stainless steel, the base metal is regarded as an isotropic material, and the weld area is regarded as an anisotropic material. The elastic constant matrix of 316 stainless steel is as follows:
[0030]
[0031] The density of 316 stainless steel is 8120kg / m 3 . like figure 2 shown. The anisotropic weld part is set as six-layer grains, and the directions are 285°, 315°, 330°, 30°, 45° and 75° respectively.
[0032] like image 3 As shown, the specific implementation steps of the acoustic ray tracing method for the weld model containing multi-layer grains are:
[0033] (1) Partition the weld model according to the grain direction.
[0034] (2) Discretize the boundary lines of each district in the form of points.
[0035] (3) Calculate the propagation time from the initial point to the discrete points on each boundary line step by step.
[0036] (4) Calculate the travel time from the target point to the discrete point on ...
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Abstract
The invention discloses a tracing method of ultrasound ray in an anisotropic welding line on basis of the Fermat principle, and belongs to the field of nondestructive testing. The tracing to the propagation path of ultrasonic wave in the anisotropic welding line is beneficial to the accurate positioning of a flaw in the anisotropic welding line, and belongs to the field of nondestructive testing. According to the method, a welding line model is established, the welding line model is divided into areas, the border line of each area is discretized, the only thing to do is to compute the propagation time from an initial point to each discrete point on the border line and the propagation time from each discrete point to a target point, and a path with the minimal propagation time being determined through the Fermat principle is the determined propagation path. The method has the advantages that a discretized thought is provided, and the computation of the propagation time can be performed with the same method despite the how many layers of crystal particles are divided.
Description
technical field [0001] The invention relates to a method for tracking ultrasonic sound rays in anisotropic welds based on Fermat's principle, in particular to a method suitable for determining ultrasonic propagation paths in anisotropic welds represented by austenitic stainless steel. By tracking the propagation path of ultrasonic waves in anisotropic welds, it is helpful to realize accurate positioning of defects in anisotropic welds, and belongs to the field of non-destructive testing. Background technique [0002] Austenitic stainless steel has the characteristics of excellent corrosion resistance, oxidation resistance and low temperature toughness, and is widely used in key parts of major basic industries such as petrochemical, machinery manufacturing and nuclear power, such as coolant pipes in nuclear power, spacecraft in fuselage, bulkheads and pressure vessels. In these large-scale equipment, the connection between austenitic stainless steel structures is mostly weld...
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IPC IPC(8): G01N29/04
CPCG01N29/048G01N2291/2675
Inventor 吴斌杨敬焦敬品何存富
Owner BEIJING UNIV OF TECH