Method and system for non-contact evaluation of fatigue properties of composite structures

A technology for composite materials, fatigue properties, used in the analysis of materials, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc.

Active Publication Date: 2019-03-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, before structural fatigue damage, the material cannot produce obvious defects, and it is difficult to effectively evaluate the basic microscopic damage forms by using traditional non-destructive testing methods

Method used

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  • Method and system for non-contact evaluation of fatigue properties of composite structures
  • Method and system for non-contact evaluation of fatigue properties of composite structures
  • Method and system for non-contact evaluation of fatigue properties of composite structures

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Embodiment Construction

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0061] figure 1 The flowchart of the method for non-contact evaluation of the fatigue properties of composite material structure provided by the present invention, such as figure 1 As shown, the present invention provides a non-contact method for evaluating the fatigue properties of composite structures.

[0062] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further desc...

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Abstract

The invention discloses a method and a system for non-contact assessing of fatigue property of a compound material structure based on Lamb wave field analysis. The method comprises the following steps: acquiring a fatigue property data of a to-be-measured compound material structure sample; acquiring a propagating wave field data of Lamb wave in the to-be-measured compound material structure sample; extracting a propagating feature parameter of the Lamb wave in the sample; establishing a relationship of phase velocity cp, different modal energy distribution ratio rm, load stress S and load periodicity N; controlling a laser ultrasonic testing system to acquire the propagating wave field data of Lamb wave of the to-be-measured compound material structure; extracting the propagating feature parameter of the Lamb wave of the to-be-measured compound material structure when the load stress is S*; acquiring the load periodicity of the to-be-measured compound material structure; assessing the fatigue property of the to-be-measured compound material structure. According to the assessing method and system, the information of the load periodicity is forecast by measuring the propagating feature parameter of the Lamb wave, so that the assessment for the fatigue property of the compound material is realized.

Description

technical field [0001] The invention relates to the technical field of performance evaluation of composite materials, in particular to a method and system for non-contact evaluation of fatigue characteristics of composite material structures. Background technique [0002] In order to reduce the weight of the structure, improve the efficiency of material use, and give full play to the bearing potential of the composite material itself, it is an inevitable trend for future development to increase the allowable strength value of the structure. However, with the increase of the allowable strength value of the composite material structure, the fatigue problem covered by the high-strength design of the composite material structure gradually appears, thus restricting the development of aeronautical structures. Therefore, the evaluation of fatigue properties of composite materials has become a new research hotspot in the field of nondestructive testing. When the composite material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/041G01N2291/011G01N2291/0427
Inventor 裘进浩张超季宏丽姚卫星王湛赵金玲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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