Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for inverting elastic constant of composite material with anisotropic characteristics

An elastic constant and anisotropic technology, which is applied in the direction of material analysis, material analysis, and detection response signal processing using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as unsuitable materials and structures, and complicated measurement and calculation processes. Achieve high test efficiency, low test environment requirements, and easy operation

Pending Publication Date: 2022-05-03
CHONGQING UNIV
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention of this method obtains the elastic modulus of the material to be tested by solving the theoretical dispersion curve of the guided wave and comparing and analyzing it with the measured dispersion curve, but the measurement and calculation process of the method is complicated, and the method is based on isotropic materials (such as: The guided wave theory in homogeneous materials such as metals and resins) can measure the elastic modulus and Poisson’s ratio, but for materials and structures with anisotropic characteristics (at least 5 independent elastic constants) such as composite materials not applicable

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for inverting elastic constant of composite material with anisotropic characteristics
  • Method for inverting elastic constant of composite material with anisotropic characteristics
  • Method for inverting elastic constant of composite material with anisotropic characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0065] A composite material with 0, 90° layup: the layup sequence is [0 / 90 / 0 / 90 / 0 / 90], the thickness is 4.4mm; the density of the CFRP board after curing is 1400kg / m 3 . The parameters of the composite single-layer board (provided by the manufacturer) are: C 11 =119GPa,C 12 =6.2GPa,C 13 =6.2GPa,C 22 =13.8GPa, C 23 =4.5GPa,C 33 =13.8GPa, C 44 =(C 22 -C 23 ) / 2, C 55 =5.7GPa, C 66 = 5.7 Gpa.

[0066] The inversion process of this embodiment is as follows:

[0067] Step 1. Use numerical methods to solve the dispersion equations of symmetric and antisymmetric modes in orthotropic plates, and list the dispersion curves of the corresponding modes

[0068] In the literature "Lamb Wave Dispersion Curves in Orthotropic Plates", Cai Yinglong, Tie Ying, Chen Jiangyi, etc., FRP / Composite Materials, 2018 (10): 4, the phase velocity dispersion curve is obtained by calculating the phase velocity dispersion curve. figure 1 , group velocity dispersion curve see figure 2 . A in t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
densityaaaaaaaaaa
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for inverting an elastic constant of a composite material with anisotropic characteristics, which comprises the following steps of: 1, solving frequency dispersion equations of a symmetric mode and an antisymmetric mode in an orthotropic plate by adopting a numerical method, and listing frequency dispersion curves of corresponding modes; 2, the excitation frequency of the ultrasonic guided wave test is selected by analyzing the influence of the elastic constant on the frequency dispersion curve; establishing a corresponding relation graph between the elastic constant and the guided wave propagation speed; 3, measuring the propagation speeds of the symmetric mode and the antisymmetric mode in the composite material structure by using an ultrasonic guided wave detection method; and 4, performing inversion by using the relation graph of the elastic constants and the guided wave propagation velocity to obtain the corresponding elastic constants. The method has the technical effects that the anisotropic composite material can be subjected to nondestructive testing, and the elastic modulus and the shear modulus of the composite material component in each main shaft direction can be accurately and quickly obtained.

Description

technical field [0001] The invention belongs to the field of mechanical performance testing of composite materials, and in particular relates to a method for determining the elastic constant of composite materials by means of ultrasonic guided wave detection. Background technique [0002] Composite materials have high specific strength, high specific modulus, corrosion resistance, fatigue resistance and other excellent properties, and have been widely used in aerospace, automobiles, ships and daily life. In the field of aerospace, the size of composite material components is large, and there is a specific need for testing methods related to elastic modulus for such large components. Existing ultrasonic testing methods use body waves or surface waves for measurement, but for composite materials, their elastic properties are anisotropic, and it is impossible to obtain reliable results in each axis direction on large components by body wave methods. [0003] The measurement of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/24G01N29/44
CPCG01N29/07G01N29/24G01N29/44G01N2291/011G01N2291/023Y02T90/00
Inventor 刘瑶璐姜又强王云林胡宁孔维夷张建胡寿丰
Owner CHONGQING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com