R-region sound ray tracing algorithm for curved-surface fiber-reinforced resin matrix composite material multi-directional plate

A fiber-reinforced resin and composite material technology, which is applied in the analysis of materials, material analysis using sound waves/ultrasonic waves/infrasonic waves, and solid state analysis using sound waves/ultrasonic waves/infrasonic waves. It can solve the problem of complex sound ray paths, limited applications, and low efficiency And other issues

Active Publication Date: 2020-12-15
DALIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the above two acoustic ray tracing methods are used for post-processing and reconstruction of ultrasound images, a large number of iterative operations need to be performed, the efficiency is low, and the application is limited.
Moreover, for the R zone

Method used

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  • R-region sound ray tracing algorithm for curved-surface fiber-reinforced resin matrix composite material multi-directional plate
  • R-region sound ray tracing algorithm for curved-surface fiber-reinforced resin matrix composite material multi-directional plate
  • R-region sound ray tracing algorithm for curved-surface fiber-reinforced resin matrix composite material multi-directional plate

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Experimental program
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Embodiment Construction

[0051] like figure 1 As shown, the experiment uses a 5L64-NW1 linear array probe (5MHz center frequency, a total of 64 array elements, the size of a single array element is 0.92mm×7mm, the edge distance between adjacent array elements is 0.08mm, and the center distance between adjacent array elements is p=1mm ) Array elements 1 to 31 are used as active array elements, and the probe is placed horizontally above the convex side of the R zone of the CFRP multi-directional plate sample (that is, the angle between the probe and the right plate surface of the R zone δ=π / 4), and The vertical distance D between the convex side surfaces of the R zone is 10 mm, and the space between them is filled with water (sonic speed 1483.40 m / s). The radius of curvature of the convex side surface of the R zone of the CFRP multi-directional plate sample is R=8.80mm, and the lengths of the plates on the left and right sides are 10mm respectively. Define the x-axis to be horizontal to the right, the ...

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Abstract

The invention discloses an R-region sound ray tracing algorithm for a curved-surface fiber-reinforced resin-based composite material multi-directional plate, and belongs to the technical field of composite material ultrasonic detection. The algorithm comprises the following steps: gridding an R region along the circumferential direction and the thickness direction; establishing a function relational expression, namely a sound velocity model, of the sound velocity of the R region of the FRP composite material multi-directional plate relative to changes of the spatial position and the sound propagation direction angle; defining a connection relationship and a connection weight value between the grid nodes according to the relative position relationship between a starting point and a target point; and according to the Fermat shortest sound time principle, using a Dijkstra shortest path search algorithm to search and calculate the propagation path and time of the ultrasonic waves between the starting point and the target point from the grid nodes. The algorithm can realize accurate and rapid inversion calculation of the acoustic propagation path and time between any two points in the Rregion of the FRP composite material multidirectional plate, lays a foundation for quantitative evaluation of the influence rule of the material on the acoustic propagation behavior, and provides a tool for inversion of a large number of acoustic ray paths for phased array ultrasonic imaging detection.

Description

technical field [0001] The invention relates to a sound ray tracing algorithm in the R zone of a curved fiber reinforced plastic (FRP) multi-directional plate, which belongs to the technical field of ultrasonic detection of composite materials. Background technique [0002] Due to its light weight, high strength and strong designability, fiber reinforced resin matrix composites (Fiber Reinforced Plastics, CFRP) are increasingly replacing metals in load-bearing components of aircraft, rockets and wind turbine blades. These components are generally large in size and complex in shape, and there are a large number of corner areas (that is, R areas), which are weak links in the manufacturing and service stages. In order to realize the quality control of FRP components, it is necessary to detect internal defects in the R zone in time with the help of non-destructive testing technology. Among them, ultrasonic testing technology is the most widely used and has the greatest developme...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/4454G01N29/4472
Inventor 林莉罗忠兵曹欢庆金士杰
Owner DALIAN UNIV OF TECH
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