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

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...

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 of the FRP multi-directional panel with more complex acoustic characteristics, the sound ray path will not only change the propagation direction continuously inside the single ply, but also deflect when passing through the ply interface. R area is more complicated

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