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A method for building a fiber-reinforced resin-based composite material r-zone ultrasonic testing model

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: 2017-12-26
DALIAN UNIV OF TECH
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  • Summary
  • 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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  • A method for building a fiber-reinforced resin-based composite material r-zone ultrasonic testing model
  • A method for building a fiber-reinforced resin-based composite material r-zone ultrasonic testing model
  • A method for building a fiber-reinforced resin-based composite material r-zone ultrasonic testing model

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Embodiment Construction

[0030] In the following, 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 Archimedes drainage method ρ=1.54g / cm 3 ; Dissect the sample along the plane perpendicular to the axial direction 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 is t=0.190mm, the total number of layers is N=16, and the fiber laying order is α i =[45 / 0 / -45 / 90] ...

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Abstract

The invention discloses a method for establishing an ultrasonic testing model of an R-zone of a fiber reinforced resin (Fiber Reinforced Plastic, FRP) composite material, belonging to the technical field of ultrasonic testing of composite materials. The method includes the following steps: measuring the geometric dimensions and density of the sample in the R zone of the FRP composite material; dissecting and polishing the cross-section of the sample in the R zone and observing its microstructure, including the thickness of a single layer, the total number of layers and the order of fiber laying; Composite unidirectional plate sample sound velocity measurement and elastic stiffness matrix inversion calculation; calculate the Bond transformation matrix corresponding to any position in the R zone, and perform rotation transformation on the elastic stiffness matrix; set the parameters of the ultrasonic detection probe and the material properties of the coupling medium, Complete model building. This approach also enables a quantitative description of the elastic properties of multilayer structures and curved surface shapes while considering the anisotropy of FRP composites. The model can be used to simulate and calculate the ultrasonic testing of the R-zone of FRP composite materials, and provide support for studying the law of sound propagation and improving the quality of testing.

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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Patent Type & Authority Patents(China)
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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