Visualizing Ultrasound Propagation Using a Pulsed Laser and Its Application to Non-Destructive Evaluation of Impact Damage in CFRP Composite Laminates

Generally, the aircraft structural parts are economically high in cost so the materials need to be inspected for defects or damages using various non-destructive testing (NDT) methods like ultrasonic, thermography and acoustic emission. The aim of this project is to characterize the defects in composite laminates before and after the flexural loading using infra-red thermography NDT method. GFRP and hybrid (GFRP+CFRP) composite laminates are fabricated with different orientation such as uni-directional, cross ply, anti-symmetric and angle ply and then tested under flexural loading according to ASTM D790 standard. The volume fraction of the fibre and matrix needs to be found out to know the void content and the mixing ratio of reinforcement and binder.

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Quantitative non-destructive evaluation method for impact damage using eddy current pulsed thermography

Composites Part B Engineering ◽

10.1016/j.compositesb.2013.05.004 ◽

2013 ◽

Vol 54 ◽

pp. 169-179 ◽

Cited By ~ 41

Author(s):

Wenwei Ren ◽

Jia Liu ◽

Gui Yun Tian ◽

Bin Gao ◽

Liang Cheng ◽

...

Keyword(s):

Eddy Current ◽

Evaluation Method ◽

Impact Damage ◽

Pulsed Thermography ◽

Non Destructive Evaluation ◽

Non Destructive

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Comparison between different non-destructive techniques methods to detect and characterize impact damage on composite laminates

Journal of Composite Materials ◽

10.1177/0021998319864411 ◽

2019 ◽

Vol 54 (5) ◽

pp. 617-631 ◽

Cited By ~ 3

Author(s):

I Papa ◽

MR Ricciardi ◽

V Antonucci ◽

A Langella ◽

J Tirillò ◽

...

Keyword(s):

Composite Laminates ◽

Impact Damage ◽

Speckle Pattern ◽

Contact Point ◽

Mechanical Tests ◽

Low Velocity Impact ◽

Electronic Speckle Pattern Interferometry ◽

Internal Damage ◽

Non Destructive ◽

Non Destructive Techniques

This paper aims to investigate the ability of ultrasonic and electronic speckle pattern interferometry to analyse the low-velocity impact internal damage mechanisms on basalt composite laminates and to provide information on the shape and the extent of the delamination in non-destructive way. Basalt/epoxy composites with different thicknesses have been realised and characterised by mechanical tests to investigate both fibre-dominated (tensile and flexural behaviour) and matrix-dominated properties (interlaminar shear strength). Specimens were impacted at penetration and at increasing energy values, to explore the damage onset and propagation. The results showed that the damage was concentrated under the impactor–material contact point and that the composite with intermediate thickness had the best balance between the different kinds of impact damages: delamination and indentation. Further, a good agreement was found between the overall data obtained by the two non-destructive techniques, confirming the capability of both techniques to examine the composite impact damage.

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Photo-Acoustic Based Non-Contact and Non-Destructive Evaluation for Detection of Damage Precursors in Composites

Volume 1: Advances in Aerospace Technology ◽

10.1115/imece2018-86148 ◽

2018 ◽

Author(s):

Siqi Wang ◽

Liangzhong Xiang ◽

Yingtao Liu ◽

Hong Liu

Keyword(s):

High Resolution ◽

Imaging System ◽

Three Dimensional ◽

Pulsed Laser ◽

Complex Load ◽

Pull Out ◽

Matrix Cracks ◽

Non Destructive Evaluation ◽

Cfrp Composites ◽

Non Destructive

Damage precursor in composites can lead to large structural damages, such as delamination, in carbon fiber reinforced plastic (CFRP) composites due to complex load conditions and environmental effects. In addition, multiple types of damage precursors including micro-scale matrix cracks, fiber pull-out from matrix, and fiber breakages, are extremely difficult to detect due to the limitation of resolution of current non-destructive evaluation (NDE) technologies. This paper presents a photo-acoustic based non-contact NDE system for the detection of damage precursors with extremely high resolution up to one hundred micrometers. This system consists of three major components: picoseconds pulsed laser based ultrasonic actuator, ultrasound receiver, and data processing and computing subsystem. Picoseconds pulsed laser is used to generate ultrasonic propagations in composites during the NDE process, and the ultrasound signals are recorded by the ultrasound receiver. Three-dimensional microstructure of the individual composites grid within the composite is able to be reconstructed for further analysis. The size and position of the damage precursors are evaluated with high accuracy up to 100 μm. The experimental results demonstrate that this imaging system is able to provide a novel non-contact approach with extremely high resolution for damage detection of CFRP composites. In addition, the developed NDE system has a wide industrial application in aerospace, automobile, civil, mechanical, and other key industries.

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Evaluation of hygrothermal ageing in CFRP composite material using a non-destructive approach

Journal of Composite Materials ◽

10.1177/0021998320967054 ◽

2020 ◽

pp. 002199832096705

Author(s):

Nilesh Bagale ◽

M R Bhat

Keyword(s):

Water Environment ◽

Hot Water ◽

Fiber Reinforced Polymer ◽

Carbon Fiber Reinforced Polymer ◽

X Ray ◽

Reinforced Polymer ◽

Non Destructive Evaluation ◽

Hygrothermal Ageing ◽

Cfrp Composite ◽

Non Destructive

Hygrothermal (HT) ageing is a major concern for polymer composites in aircraft structures. An aircraft gets inspected after certain flying hours/cycles consuming man-hours, money and time. For economic inspection, non-contact, Non-destructive Evaluation (NDE) techniques can prove to be effective. This study presents NDE approaches using three such techniques, namely, X-ray radiography, ultrasound, and infrared thermography for evaluation of HT-ageing in Carbon Fiber Reinforced Polymer (CFRP) composites. For accelerating the ageing, specimens were subjected to a hot water environment up to more than 1000 hours at [Formula: see text]C. It’s influence on different NDE parameters through each technique was investigated. Building on the findings, the effectiveness of these techniques for the evaluation of HT-ageing in CFRP has been demonstrated.

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