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Sound ray tracing algorithm of fiber reinforced plastic composite material laminated plate

A technology of fiber-reinforced resin and composite materials, which is applied in the field of acoustic ray tracing algorithm of fiber-reinforced resin-based composite laminates, which can solve the problems of low efficiency and large amount of calculation, and achieve the effect of precise analysis tools and precise calculation

Active Publication Date: 2016-09-07
DALIAN UNIV OF TECH
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Problems solved by technology

However, the above sound ray tracing schemes all use iterative solution method, which has a large amount of calculation, and is particularly inefficient when reconstructing multiple sound rays with high precision.

Method used

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  • Sound ray tracing algorithm of fiber reinforced plastic composite material laminated plate
  • Sound ray tracing algorithm of fiber reinforced plastic composite material laminated plate
  • Sound ray tracing algorithm of fiber reinforced plastic composite material laminated plate

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Embodiment Construction

[0042] The present invention will be further described below with reference to the accompanying drawings, taking the CFRP composite material laminated board as an example. The laying sequence is [0 / 45 / 90 / -45], a total of 4 layers, the thickness of a single layer is δ=0.15mm, and the density is ρ=1.56g / cm 3 .

[0043]1. The CFRP composite laminate sample is divided into four partitions with the ply as the unit. Each partition is equivalent to a homogeneous elastic anisotropic medium, and its elastic properties are described by the elastic stiffness matrix. Among them, the elastic stiffness matrix value C corresponding to the 0° fiber layup 0 as follows

[0044] C 0 = 126.83 6.39 6.39 0 0 0 ...

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Abstract

The invention discloses a sound ray tracing method of a fiber reinforced plastic composite material laminated plate, and belongs to the technical field of composite material ultrasonic inspection. The method comprises the following steps: taking a single ply as a unit to partition a computational domain, and utilizing an elastic stiffness matrix and the rotation transformation of the elastic stiffness matrix to quantitatively descript the elastic characteristic space distribution of FRP (Fiber Reinforced Plastic) composite materials; combining with a Christoffel equation to solve to independently obtain the function relational expressions, which are about a propagation direction angle, of quasi-longitudinal wave group speed values corresponding to different fiber orientation lays; and carrying out computational domain meshing, utilizing a Dijkstra shortest path search algorithm to search nodes through which ultrasonic wave passes when the ultrasonic wave is transmitted to a target point from a source point, and calculating corresponding sonic time. The method can realize the quick and accurate calculation of an ultrasonic wave propagation path and sonic time in the FRP composite material which has a multilayer structure, elastic anisotropy and different fiber laying sequences, and support is provided for researching ultrasonic wave propagation behaviors, optimizing a detection parameter and improving ultrasonic imaging quality and accuracy.

Description

technical field [0001] The invention relates to an acoustic ray tracing algorithm for a fiber reinforced resin base (Fiber Reinforced Plastic, FRP) composite material laminate, belonging to the technical field of ultrasonic detection of composite materials. Background technique [0002] Ultrasonic testing is widely used in the characterization and quantitative detection of internal defects in FRP composites. However, due to the significant elastic anisotropy and heterogeneity of FRP composite materials due to their layer structure and fiber orientation arrangement, the propagation behavior of ultrasonic waves in them is complicated, which is specifically manifested as sound beam deflection and preferred orientation propagation, which leads to The quality of ultrasound imaging is poor, and the defect location and quantification are inaccurate. Therefore, an accurate description of the ultrasonic propagation path can provide support for ultrasonic imaging phase correction, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16G06F17/11G06F17/10
CPCG06F17/10G06F17/11G06F17/16
Inventor 林莉罗忠兵曹欢庆苏慧敏金士杰
Owner DALIAN UNIV OF TECH
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