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Fiber-reinforced-plastic composite material R region ultrasonic inspection model establishing method

A fiber-reinforced resin, composite material technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, complex mathematical operations, special data processing applications, etc.

Active Publication Date: 2015-12-16
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, an ultrasonic testing model that simultaneously considers the R-zone surface shape, multilayer structure, and elastic anisotropy has not been reported yet.

Method used

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  • Fiber-reinforced-plastic composite material R region ultrasonic inspection model establishing method
  • Fiber-reinforced-plastic composite material R region ultrasonic inspection model establishing method
  • Fiber-reinforced-plastic composite material R region ultrasonic inspection model establishing method

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Embodiment Construction

[0030] Hereinafter, the present invention will be further described by taking the carbon fiber reinforced resin matrix composite material R zone as an example in conjunction with the accompanying drawings.

[0031] (1) Using a vernier caliper to measure the thickness of the sample in the R zone of the CFRP composite material is 3.04mm, and using a radius gauge to measure the radius of curvature inside the R zone as R 0 =3.0mm, central angle θ=90°, axial length 10.0mm; the density of the sample measured by the Archimedes drainage method ρ=1.54g / cm 3 ; Dissect the sample along the plane perpendicular to the axis of the R zone, then grind and polish the section, and conduct metallographic observation and measurement. figure 1 It is the metallographic photo of the cross-section of the sample in the R zone of the CFRP composite material: the thickness of the single layer t = 0.190mm, the total number of layers N = 16, the order of fiber laying i =[45 / 0 / -45 / 90] 2S (wherein, i=1, 2...

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Abstract

A fiber-reinforced-plastic (FRP) composite material R region ultrasonic inspection model establishing method is disclosed and belongs to the technical field of composite material ultrasonic inspection. The method comprises the following steps: measuring the geometrical dimension and the density of an FRP composite material R region sample; dissecting and polishing the R region sample cross section and observing the microstructure, concretely observing the unidirectional ply thickness, ply sum and fiber paving sequence; measuring the acoustic velocity of the FRP composite material unidirectional plate sample and performing inversion calculation on the elasticity rigidity matrix; calculating the corresponding Bond transformation matrix of an optimal position in the R region, and performing rotation transformation on the elasticity rigidity matrix; and setting ultrasonic inspection probe parameters and coupling medium material characteristics, so as to finish model establishment. The method gives consideration to the FRP composite material anisotropy, and also realizes quantitative description on the multilayer structure and the curved-surface shape elasticity characteristic. The model can be utilized for performing simulation calculation on FRP composite material R region ultrasonic inspection, and support is provided for researching sonic propagation law and improving inspection quality.

Description

technical field [0001] The invention relates to a method for establishing an ultrasonic detection model of an R-zone of a fiber-reinforced resin (Fiber Reinforced Plastic, FRP) composite material, and belongs to the technical field of ultrasonic detection of composite materials. Background technique [0002] FRP composites have been widely used in the aerospace field due to their excellent mechanical properties and significant weight reduction effect. In order to obtain comprehensive properties such as optimal structural efficiency, aeroelasticity, and strength, FRP composite components generally have complex geometric shapes, and a large number of corner areas (R areas) appear, making it difficult for ultrasonic testing beams to be incident perpendicular to the surface of the workpiece. In addition, the orientational arrangement of high-strength carbon fibers leads to significant elastic anisotropy of FRP composites, and the mismatch of acoustic impedance at the laminate in...

Claims

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Application Information

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IPC IPC(8): G01N29/04G06F17/16G06F17/50
Inventor 罗忠兵林莉曹欢庆周伯堃苏慧敏金士杰
Owner DALIAN UNIV OF TECH
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